All posts by admin

In this video lesson I will show you how you can control a remote DC motor using your Raspberry Pi Pico W. The Pi Pico is set up as a server, and is connected to a DC motor, and TA6586 Motor Controller. The motor is controlled by a client Python program running on your desktop PC. On the client side we create a Graphical Widget, which will allow you to control both the speed and direction of the motor. the schematic for the Raspberry Pi Pico W side is shown below:

Motor Controller — Schematic for TA6586 and Raspberry Pi Pico DC Motor Control

When using the breadvolt, or any battery power supply on a breadboard project, do not turn the power supply on while the Raspberry Pi Pico is connected to USB, as you could generate voltage conflicts. It is an either or. If the USB is connected, the power supply should be OFF. Or if you are going to connect the USB, first turn off the power supply.

Then in the video, we developed the following software for the server side on the Pi Pico

import network
import usocket as socket
import secrets
import time
from machine import Pin, PWM
icPin1=Pin(14,Pin.OUT)
icPin2=Pin(15,Pin.OUT)
fPWM=PWM(icPin1)
rPWM=PWM(icPin2)
fPWM.freq(1000)
rPWM.freq(1000)

wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(secrets.SSID,secrets.PASSWORD)

# Wait for connection
while not wlan.isconnected():
    time.sleep(1)
print("Connection Completed")
print('WiFi connected')
print(wlan.ifconfig())

# Set up UDP server
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_socket.bind((wlan.ifconfig()[0], 12345))
print("Server is Up and Listening")

while True:
    print('Waiting for a request from the client...')
    # Receive request from client
    request, client_address = server_socket.recvfrom(1024)
    request=request.decode()
    print("Client Request:",request)
    print("FROM CLIENT",client_address)
    cmdArray=request.split(',')
    motorState=cmdArray[0]
    speed=int(cmdArray[1])
    rPWM.duty_u16(0)
    fPWM.duty_u16(0)
    if motorState == 'O':
        rPWM.duty_u16(0)
        fPWM.duty_u16(0)
    if motorState == 'F':
        rPWM.duty_u16(0)
        fPWM.duty_u16(int(speed/100*65535))
    if motorState == 'R':
        fPWM.duty_u16(0)
        rPWM.duty_u16(int(speed/100*65535))
    # String to send
    data =request +" CMD PROCESSES+D"
    
    # Send data to client
    server_socket.sendto(data.encode(), client_address)
    print(f'Sent data to {client_address}')

import network

import usocket as socket

import secrets

import time

from machine import Pin, PWM

icPin1=Pin(14,Pin.OUT)

icPin2=Pin(15,Pin.OUT)

fPWM=PWM(icPin1)

rPWM=PWM(icPin2)

fPWM.freq(1000)

rPWM.freq(1000)

wlan = network.WLAN(network.STA_IF)

wlan.active(True)

wlan.connect(secrets.SSID,secrets.PASSWORD)

# Wait for connection

while not wlan.isconnected():

time.sleep(1)

print("Connection Completed")

print('WiFi connected')

print(wlan.ifconfig())

# Set up UDP server

server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

server_socket.bind((wlan.ifconfig()[0], 12345))

print("Server is Up and Listening")

while True:

print('Waiting for a request from the client...')

# Receive request from client

request, client_address = server_socket.recvfrom(1024)

request=request.decode()

print("Client Request:",request)

print("FROM CLIENT",client_address)

cmdArray=request.split(',')

motorState=cmdArray[0]

speed=int(cmdArray[1])

rPWM.duty_u16(0)

fPWM.duty_u16(0)

if motorState == 'O':

rPWM.duty_u16(0)

fPWM.duty_u16(0)

if motorState == 'F':

rPWM.duty_u16(0)

fPWM.duty_u16(int(speed/100*65535))

if motorState == 'R':

fPWM.duty_u16(0)

rPWM.duty_u16(int(speed/100*65535))

# String to send

data =request +" CMD PROCESSES+D"

# Send data to client

server_socket.sendto(data.encode(), client_address)

print(f'Sent data to {client_address}')

Then for the client side, the following program runs on Python on your PC:

import socket
import time
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import sys
speedF=0
speedR=0
motorStatus='O'

# Set up UDP client
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
client_socket.settimeout(1)
server_address = ('192.168.88.19', 12345)  # Adjust IP address and port as needed

app=QApplication(sys.argv)
window=QWidget()
window.setWindowTitle("Big Boss Motor Controller")
window.setGeometry(100,100,800,600)
mainLayout=QHBoxLayout(window)
leftLayout=QVBoxLayout()
rightLayout=QVBoxLayout()

def updateMotor():
    global motorStatus,speedF,speedR
    try:
        print(motorStatus)
        if motorStatus=='F':
            cmd=motorStatus+','+str(speedF)
        if motorStatus=='R':
            cmd=motorStatus+','+str(speedR)
        if motorStatus=='O':
            cmd=motorStatus+','+str(0)

        client_socket.sendto(cmd.encode(), server_address)
        data, addr = client_socket.recvfrom(1024)
        print('Received data:', data.decode())
        
    except:
        print("Server Did Not Respond, Try Again")


def updateForSpeed(value):
    global speedF
    speedF=value
    print(speedF)
def updateRevSpeed(value):
    global speedR
    speedR=value
    print(speedR)
def motorGo():
    global motorStatus
    motorStatus = 'F'
    print("GO")
def motorRev():
    global motorStatus
    motorStatus = 'R'
    print("REV")
def motorStop():
    global motorStatus
    motorStatus = 'O'
    print("STOP")


sliderLabelF=QLabel("Forward Speed")
sliderLabelF.setStyleSheet("font-size: 20px;")
leftLayout.addWidget(sliderLabelF)

sliderF=QSlider(Qt.Vertical)
sliderF.setMinimum(0)
sliderF.setMaximum(100)
sliderF.setValue(0)
sliderF.valueChanged.connect(updateForSpeed)
sliderF.setStyleSheet("QSlider::handle:vertical {background-color: rgb(0,255,0);}")
leftLayout.addWidget(sliderF)

sliderLabelR=QLabel("Forward Speed")
sliderLabelR.setStyleSheet("font-size: 20px;")
leftLayout.addWidget(sliderLabelR)

sliderR=QSlider(Qt.Vertical)
sliderR.setMinimum(0)
sliderR.setMaximum(100)
sliderR.setValue(0)
sliderR.valueChanged.connect(updateRevSpeed)
sliderR.setStyleSheet("QSlider::handle:vertical {background-color: rgb(0,0,255);}")
leftLayout.addWidget(sliderR)

greenButton=QPushButton("GO")
greenButton.setStyleSheet("background-color: rgb(0,255,0); border-radius: 50px; min-height: 100px; font-size: 20px; color: black;")
blueButton=QPushButton("REVERSE")
blueButton.setStyleSheet("background-color: rgb(0,0,255); border-radius: 50px; min-height: 100px; font-size: 20px; color: white;")
redButton=QPushButton("STOP")
redButton.setStyleSheet("background-color: rgb(255,0,0); border-radius: 50px; min-height: 100px; font-size: 20px; color: black;")

greenButton.clicked.connect(motorGo)
rightLayout.addWidget(greenButton)

blueButton.clicked.connect(motorRev)
rightLayout.addWidget(blueButton)

redButton.clicked.connect(motorStop)
rightLayout.addWidget(redButton)

timer =QTimer()
timer.timeout.connect(updateMotor)
timer.start(200)

mainLayout.addLayout(leftLayout)
mainLayout.addLayout(rightLayout)
window.setLayout(mainLayout)
window.show()
sys.exit(app.exec_())

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import socket

import time

from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

import sys

speedF=0

speedR=0

motorStatus='O'

# Set up UDP client

client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

client_socket.settimeout(1)

server_address = ('192.168.88.19', 12345) # Adjust IP address and port as needed

app=QApplication(sys.argv)

window=QWidget()

window.setWindowTitle("Big Boss Motor Controller")

window.setGeometry(100,100,800,600)

mainLayout=QHBoxLayout(window)

leftLayout=QVBoxLayout()

rightLayout=QVBoxLayout()

def updateMotor():

global motorStatus,speedF,speedR

try:

print(motorStatus)

if motorStatus=='F':

cmd=motorStatus+','+str(speedF)

if motorStatus=='R':

cmd=motorStatus+','+str(speedR)

if motorStatus=='O':

cmd=motorStatus+','+str(0)

client_socket.sendto(cmd.encode(), server_address)

data, addr = client_socket.recvfrom(1024)

print('Received data:', data.decode())

except:

print("Server Did Not Respond, Try Again")

def updateForSpeed(value):

global speedF

speedF=value

print(speedF)

def updateRevSpeed(value):

global speedR

speedR=value

print(speedR)

def motorGo():

global motorStatus

motorStatus = 'F'

print("GO")

def motorRev():

global motorStatus

motorStatus = 'R'

print("REV")

def motorStop():

global motorStatus

motorStatus = 'O'

print("STOP")

sliderLabelF=QLabel("Forward Speed")

sliderLabelF.setStyleSheet("font-size: 20px;")

leftLayout.addWidget(sliderLabelF)

sliderF=QSlider(Qt.Vertical)

sliderF.setMinimum(0)

sliderF.setMaximum(100)

sliderF.setValue(0)

sliderF.valueChanged.connect(updateForSpeed)

sliderF.setStyleSheet("QSlider::handle:vertical {background-color: rgb(0,255,0);}")

leftLayout.addWidget(sliderF)

sliderLabelR=QLabel("Forward Speed")

sliderLabelR.setStyleSheet("font-size: 20px;")

leftLayout.addWidget(sliderLabelR)

sliderR=QSlider(Qt.Vertical)

sliderR.setMinimum(0)

sliderR.setMaximum(100)

sliderR.setValue(0)

sliderR.valueChanged.connect(updateRevSpeed)

sliderR.setStyleSheet("QSlider::handle:vertical {background-color: rgb(0,0,255);}")

leftLayout.addWidget(sliderR)

greenButton=QPushButton("GO")

greenButton.setStyleSheet("background-color: rgb(0,255,0); border-radius: 50px; min-height: 100px; font-size: 20px; color: black;")

blueButton=QPushButton("REVERSE")

blueButton.setStyleSheet("background-color: rgb(0,0,255); border-radius: 50px; min-height: 100px; font-size: 20px; color: white;")

redButton=QPushButton("STOP")

redButton.setStyleSheet("background-color: rgb(255,0,0); border-radius: 50px; min-height: 100px; font-size: 20px; color: black;")

greenButton.clicked.connect(motorGo)

rightLayout.addWidget(greenButton)

blueButton.clicked.connect(motorRev)

rightLayout.addWidget(blueButton)

redButton.clicked.connect(motorStop)

rightLayout.addWidget(redButton)

timer =QTimer()

timer.timeout.connect(updateMotor)

timer.start(200)

mainLayout.addLayout(leftLayout)

mainLayout.addLayout(rightLayout)

window.setLayout(mainLayout)

window.show()

sys.exit(app.exec_())

Python, Raspberry Pi Pico

Control DC Motor With Raspberry Pi Pico W and TA6586

April 8, 2025 admin

In this video lesson we show you how you can control a small DC motor using the Raspberry Pi Pico W and a TA6586 DC Motor Controller. We show you how to control both the speed and direction. The schematic for the circuit we use is here:

In the lesson, we developed the following code for your convenience:

from machine import Pin,PWM
import time
icPin1=Pin(14,Pin.OUT)
icPin2=Pin(15,Pin.OUT)
fPWM=PWM(icPin1)
rPWM=PWM(icPin2)
fPWM.freq(1000)
rPWM.freq(1000)
try:
    while True:
        for speed in range(20,101,10):
            rPWM.duty_u16(0)
            fPWM.duty_u16(int(speed/100*65535))
            time.sleep(.25)
        for speed in range(100,-1,-10):
            rPWM.duty_u16(0)
            fPWM.duty_u16(int(speed/100*65535))
            print(int(speed/100*65535))
            time.sleep(.25)
        time.sleep(2)
        for speed in range(20,101,10):
            fPWM.duty_u16(0)
            rPWM.duty_u16(int(speed/100*65535))
            time.sleep(.25)
        for speed in range(100,-1,-10):
            fPWM.duty_u16(0)
            rPWM.duty_u16(int(speed/100*65535))
            print(int(speed/100*65535))
            time.sleep(.25)
        time.sleep(2)
        
        
except KeyboardInterrupt:
    print("Program Stopped by User")
    rPWM.duty_u16(0)
    fPWM.duty_u16(0)
    time.sleep(.15)
    rPWM.deinit()
    fPWM.deinit()
    icPin1.off()
    icPin2.off()

from machine import Pin,PWM

import time

icPin1=Pin(14,Pin.OUT)

icPin2=Pin(15,Pin.OUT)

fPWM=PWM(icPin1)

rPWM=PWM(icPin2)

fPWM.freq(1000)

rPWM.freq(1000)

try:

while True:

for speed in range(20,101,10):

rPWM.duty_u16(0)

fPWM.duty_u16(int(speed/100*65535))

time.sleep(.25)

for speed in range(100,-1,-10):

rPWM.duty_u16(0)

fPWM.duty_u16(int(speed/100*65535))

print(int(speed/100*65535))

time.sleep(.25)

time.sleep(2)

for speed in range(20,101,10):

fPWM.duty_u16(0)

rPWM.duty_u16(int(speed/100*65535))

time.sleep(.25)

for speed in range(100,-1,-10):

fPWM.duty_u16(0)

rPWM.duty_u16(int(speed/100*65535))

print(int(speed/100*65535))

time.sleep(.25)

time.sleep(2)

except KeyboardInterrupt:

print("Program Stopped by User")

rPWM.duty_u16(0)

fPWM.duty_u16(0)

time.sleep(.15)

rPWM.deinit()

fPWM.deinit()

icPin1.off()

icPin2.off()

Arduino

Portable Arduino Weather Station Project

March 20, 2025 admin

In this video lesson we show how to build a portable Arduino Weather Station. The station is powered by a battery bank, and data is displayed on the SSD1306 OLED display. The station included the BMP180 pressure sensor for barometric pressure, the DHT 11 for temperature and humidity, and a push button to toggle between modes. The schematic of the circuit is shown below.

When using the breadvolt, or any battery power supply on a breadboard project, do not turn the power supply on while the Arduino is connected to USB, as you could generate voltage conflicts. It is an either or. If the USB is connected, the power supply should be OFF. Or if you are going to connect the USB, first turn off the power supply.

The code developed in the video is included for your convenience below:

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_BMP085.h>

//**********************************************
#include <DHT.h>
#define DHTPIN 11
#define DHTTYPE DHT11
DHT dht(DHTPIN,DHTTYPE);

int butPin=2;
int butVal=0;
int butValOld=0;
int butCount=0;
int butRem=0;

float tempF;
float tempC;
float hum=50;
int hReadTime=0;
int hReadInt=2000;

float humRaw[128];
float normHum[128];
float tempRaw[128];
float normTemp[128];

int lastUpdate = 0;
int updateInterval = 600;

float rawXdata[128];
int normXdata[128];

float rawYdataP[128];
int normYdataP[128];
float rawYdataH[128];
int normYdataH[128];
float rawYdataT[128];
int normYdataT[128];

float xMin = 0;       //************************************
float xMax = 127;

float yMinP = 28;
float yMaxP = 31;
float yMinH=30;
float yMaxH=90;
float yMinT=60;
float yMaxT=90;

float Pt = 14;
float Pb = 63;

float Pl = 0;
float Pr = 127;

int numPoints = 128;

Adafruit_BMP085 BP;
bool BMPconnected = false;

float BarPress = 30;
float BarPressNow = 30;
float alt = 1127;    //****************************

int screenWidth = 128;
int screenHeight = 64;
int oledReset = -1;
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 oled(screenWidth, screenHeight, &Wire, oledReset);

void setup() {
  // put your setup code here, to run once:
  pinMode(butPin,INPUT_PULLUP); //*********************
  Serial.begin(9600);
  BMPconnected = BP.begin();
  if (BMPconnected == true) {
    Serial.println("BMP180 found and Connected");
  }
  if (BMPconnected == false) {
    Serial.println("BMP180 not found, Check Connections");
  }
  oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  oled.clearDisplay();
  oled.display();
  for (int i = 0; i < numPoints; i= i + 1) {
    rawXdata[i] = i;
  }
  dht.begin();
  delay(2000);
}

void loop() {
  // put your main code here, to run repeatedly:
  BarPressNow = normPress(alt);
  BarPress = .95 * BarPress + .05 * BarPressNow;  
  tempC=BP.readTemperature();         //***********************
  tempF=tempC*9/5 +32;
  if (millis()-hReadTime>hReadInt){
    hum=dht.readHumidity();
    Serial.println(hum);
    hReadTime=millis();
  }

  if (millis() - lastUpdate >= updateInterval) {
    for (int i = 0; i < numPoints - 1; i = i + 1) {
      rawYdataP[i] = rawYdataP[i + 1];
      rawYdataT[i] = rawYdataT[i + 1];
      rawYdataH[i] = rawYdataH[i + 1];
    }
    lastUpdate=millis();
    rawYdataP[numPoints-1]=BarPress;
    rawYdataT[numPoints-1]=tempF;
    rawYdataH[numPoints-1]=hum;
    //normData();
    //oled.clearDisplay();
    //plotGraph();
  }
  butVal=digitalRead(butPin);
  if (butVal==0 && butValOld==1){
    butCount=butCount+1;
    butRem=butCount%4;
  }
  butValOld=butVal;
  if (butRem==0){
  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.setTextSize(2);
  oled.print(tempF);
  oled.println(" F");
  oled.print(hum);
  oled.println(" %Hum");
  oled.print(BarPress);
  oled.println(" InHG");
  oled.display();
  }
  if (butRem==1){
  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.setTextSize(2);
  oled.print(BarPress);
  oled.setTextSize(1);
  oled.println(" InHG");
  normDataP();             //***********************
  plotPress();           //***********************
  oled.display();
  delay(.1);
  }
  if (butRem==2){
  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.setTextSize(2);
  oled.print(tempF);
  oled.setTextSize(1);
  oled.println(" F");
  normDataT();             //***********************
  plotTemp();           //***********************
  oled.display();
  delay(.1);
  }
  if (butRem==3){
  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.setTextSize(2);
  oled.print(hum);
  oled.setTextSize(1);
  oled.println(" %HUM");
  normDataH();             //***********************
  plotHum();           //***********************
  oled.display();
  delay(.1);
  }
}

float normPress(float elev) {
  float BPRaw;
  float BPNorm;
  float T0 = 288.15;
  float L = .0065;
  float R = 8.3144598;
  float M = .0289644;
  float g = 9.8;
  float c = M * g / (R * L);
  BPRaw = BP.readPressure() * .0002953;
  BPNorm = BPRaw / pow(1 - L * elev / T0, c);
  return BPNorm;
}
void normDataP() {
  for (int i = 0; i < numPoints; i = i + 1) {
    normYdataP[i] = (Pb - Pt) / (yMinP - yMaxP) * (rawYdataP[i] - yMaxP) + Pt;
    normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;
  }
}
  void normDataT() {
  for (int i = 0; i < numPoints; i = i + 1) {
    normYdataT[i] = (Pb - Pt) / (yMinT - yMaxT) * (rawYdataT[i] - yMaxT) + Pt;
    normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;
  }
  }
  void normDataH() {
  for (int i = 0; i < numPoints; i = i + 1) {
    normYdataH[i] = (Pb - Pt) / (yMinH - yMaxH) * (rawYdataH[i] - yMaxH) + Pt;
    normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;
  }
}
void plotPress() {                    //plot Pressure
  oled.drawLine(Pl, Pt, Pl, Pb, WHITE);
  oled.drawLine(Pl, Pb, Pr, Pb, WHITE);
  int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt;    //********** 
  oled.drawLine(Pl, MID, Pr, MID, WHITE);
  for (int i = 0; i < numPoints - 1; i = i + 1) {
    oled.drawLine(normXdata[i], normYdataP[i], normXdata[i + 1], normYdataP[i + 1], WHITE); //***********
  }
}
void plotTemp() {                    //plot Pressure
  oled.drawLine(Pl, Pt, Pl, Pb, WHITE);
  oled.drawLine(Pl, Pb, Pr, Pb, WHITE);
  //int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt;    //********** 
  //oled.drawLine(Pl, MID, Pr, MID, WHITE);
  for (int i = 0; i < numPoints - 1; i = i + 1) {
    oled.drawLine(normXdata[i], normYdataT[i], normXdata[i + 1], normYdataT[i + 1], WHITE); //***********
  }
}
void plotHum() {                    //plot Pressure
  oled.drawLine(Pl, Pt, Pl, Pb, WHITE);
  oled.drawLine(Pl, Pb, Pr, Pb, WHITE);
  //int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt;    //********** 
  //oled.drawLine(Pl, MID, Pr, MID, WHITE);
  for (int i = 0; i < numPoints - 1; i = i + 1) {
    oled.drawLine(normXdata[i], normYdataH[i], normXdata[i + 1], normYdataH[i + 1], WHITE); //***********
  }
}

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#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#include <Adafruit_BMP085.h>

//**********************************************

#include <DHT.h>

#define DHTPIN 11

#define DHTTYPE DHT11

DHT dht(DHTPIN,DHTTYPE);

int butPin=2;

int butVal=0;

int butValOld=0;

int butCount=0;

int butRem=0;

float tempF;

float tempC;

float hum=50;

int hReadTime=0;

int hReadInt=2000;

float humRaw[128];

float normHum[128];

float tempRaw[128];

float normTemp[128];

int lastUpdate = 0;

int updateInterval = 600;

float rawXdata[128];

int normXdata[128];

float rawYdataP[128];

int normYdataP[128];

float rawYdataH[128];

int normYdataH[128];

float rawYdataT[128];

int normYdataT[128];

float xMin = 0; //************************************

float xMax = 127;

float yMinP = 28;

float yMaxP = 31;

float yMinH=30;

float yMaxH=90;

float yMinT=60;

float yMaxT=90;

float Pt = 14;

float Pb = 63;

float Pl = 0;

float Pr = 127;

int numPoints = 128;

Adafruit_BMP085 BP;

bool BMPconnected = false;

float BarPress = 30;

float BarPressNow = 30;

float alt = 1127; //****************************

int screenWidth = 128;

int screenHeight = 64;

int oledReset = -1;

#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 oled(screenWidth, screenHeight, &Wire, oledReset);

void setup() {

// put your setup code here, to run once:

pinMode(butPin,INPUT_PULLUP); //*********************

Serial.begin(9600);

BMPconnected = BP.begin();

if (BMPconnected == true) {

Serial.println("BMP180 found and Connected");

}

if (BMPconnected == false) {

Serial.println("BMP180 not found, Check Connections");

}

oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

oled.clearDisplay();

oled.display();

for (int i = 0; i < numPoints; i= i + 1) {

rawXdata[i] = i;

}

dht.begin();

delay(2000);

}

void loop() {

// put your main code here, to run repeatedly:

BarPressNow = normPress(alt);

BarPress = .95 * BarPress + .05 * BarPressNow;

tempC=BP.readTemperature(); //***********************

tempF=tempC*9/5 +32;

if (millis()-hReadTime>hReadInt){

hum=dht.readHumidity();

Serial.println(hum);

hReadTime=millis();

}

if (millis() - lastUpdate >= updateInterval) {

for (int i = 0; i < numPoints - 1; i = i + 1) {

rawYdataP[i] = rawYdataP[i + 1];

rawYdataT[i] = rawYdataT[i + 1];

rawYdataH[i] = rawYdataH[i + 1];

}

lastUpdate=millis();

rawYdataP[numPoints-1]=BarPress;

rawYdataT[numPoints-1]=tempF;

rawYdataH[numPoints-1]=hum;

//normData();

//oled.clearDisplay();

//plotGraph();

}

butVal=digitalRead(butPin);

if (butVal==0 && butValOld==1){

butCount=butCount+1;

butRem=butCount%4;

}

butValOld=butVal;

if (butRem==0){

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

oled.print(tempF);

oled.println(" F");

oled.print(hum);

oled.println(" %Hum");

oled.print(BarPress);

oled.println(" InHG");

oled.display();

}

if (butRem==1){

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

oled.print(BarPress);

oled.setTextSize(1);

oled.println(" InHG");

normDataP(); //***********************

plotPress(); //***********************

oled.display();

delay(.1);

}

if (butRem==2){

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

oled.print(tempF);

oled.setTextSize(1);

oled.println(" F");

normDataT(); //***********************

plotTemp(); //***********************

oled.display();

delay(.1);

}

if (butRem==3){

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

oled.print(hum);

oled.setTextSize(1);

oled.println(" %HUM");

normDataH(); //***********************

plotHum(); //***********************

oled.display();

delay(.1);

}

float normPress(float elev) {

float BPRaw;

float BPNorm;

float T0 = 288.15;

float L = .0065;

float R = 8.3144598;

float M = .0289644;

float g = 9.8;

float c = M * g / (R * L);

BPRaw = BP.readPressure() * .0002953;

BPNorm = BPRaw / pow(1 - L * elev / T0, c);

return BPNorm;

}

void normDataP() {

for (int i = 0; i < numPoints; i = i + 1) {

normYdataP[i] = (Pb - Pt) / (yMinP - yMaxP) * (rawYdataP[i] - yMaxP) + Pt;

normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;

}

void normDataT() {

for (int i = 0; i < numPoints; i = i + 1) {

normYdataT[i] = (Pb - Pt) / (yMinT - yMaxT) * (rawYdataT[i] - yMaxT) + Pt;

normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;

}

void normDataH() {

for (int i = 0; i < numPoints; i = i + 1) {

normYdataH[i] = (Pb - Pt) / (yMinH - yMaxH) * (rawYdataH[i] - yMaxH) + Pt;

normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;

}

void plotPress() { //plot Pressure

oled.drawLine(Pl, Pt, Pl, Pb, WHITE);

oled.drawLine(Pl, Pb, Pr, Pb, WHITE);

int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt; //**********

oled.drawLine(Pl, MID, Pr, MID, WHITE);

for (int i = 0; i < numPoints - 1; i = i + 1) {

oled.drawLine(normXdata[i], normYdataP[i], normXdata[i + 1], normYdataP[i + 1], WHITE); //***********

}

void plotTemp() { //plot Pressure

oled.drawLine(Pl, Pt, Pl, Pb, WHITE);

oled.drawLine(Pl, Pb, Pr, Pb, WHITE);

//int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt; //**********

//oled.drawLine(Pl, MID, Pr, MID, WHITE);

for (int i = 0; i < numPoints - 1; i = i + 1) {

oled.drawLine(normXdata[i], normYdataT[i], normXdata[i + 1], normYdataT[i + 1], WHITE); //***********

}

void plotHum() { //plot Pressure

oled.drawLine(Pl, Pt, Pl, Pb, WHITE);

oled.drawLine(Pl, Pb, Pr, Pb, WHITE);

//int MID = (Pb - Pt) / (yMinP - yMaxP) * (29.92 - yMaxP) + Pt; //**********

//oled.drawLine(Pl, MID, Pr, MID, WHITE);

for (int i = 0; i < numPoints - 1; i = i + 1) {

oled.drawLine(normXdata[i], normYdataH[i], normXdata[i + 1], normYdataH[i + 1], WHITE); //***********

}

Python, Raspberry Pi Pico

Plotting Live Data in Python Using PyQT

March 18, 2025 admin

In this video lesson we show how Live Data can be plotted using a PyQt window. Our eventual goal is to bring in live data from the Raspberry Pi Pico W using UDP over WiFi, but to learn the concepts today, we will be generating a live sin wave to show how the plotting works. Here is the code we developed in this lesson:

import sys
import numpy as np
import pyqtgraph as pg
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *

numPoints = 200
xStart = 0
xStop = 4*np.pi

frequency = 1
Inc = (2*np.pi/numPoints)

count=0
incR=1
incG=2

x=np.linspace(xStart,xStop,numPoints)
ySin=np.sin(frequency*x)
ySin2 = np.sin(frequency*x + 2*np.pi/3)
ySin3 = np.sin(frequency*x + 4*np.pi/3)

def updatePlot():
    global numPoint,xStart,xStop,Inc,frequency,count
    xStart=xStart + Inc
    xStop=xStop + Inc
    x =np.linspace(xStart, xStop , numPoints)
    ySin=np.sin(frequency*x+count*incR/100*frequency)
    ySin2 = np.sin(frequency*x + 2*np.pi/3+count*incG/100*frequency)
    ySin3 = np.sin(frequency*x + 4*np.pi/3)
    
    plotSin.setData(x, ySin)
    plotSin2.setData(x, ySin2)
    plotSin3.setData(x, ySin3)
    
    count=count+1

def updateFrequency(value):
    global frequency, sliderLabel
    frequency = value/10
    sliderLabel.setText("Frequency: "+str(frequency)+" Hz")

app=QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("The Magic of Sin Waves")
window.setGeometry(100,100,800,600)
layout = QVBoxLayout(window)

sliderLabel=QLabel("Frequency: 1 Hz")
sliderLabel.setStyleSheet("font-size: 40px;")
layout.addWidget(sliderLabel)

slider = QSlider(Qt.Horizontal)
slider.setMinimum(1)
slider.setMaximum(40)
slider.setValue(10)
slider.valueChanged.connect(updateFrequency)
layout.addWidget(slider)

graphWidget =pg.PlotWidget()
layout.addWidget(graphWidget)
plotSin=graphWidget.plot(x,ySin,pen=pg.mkPen('r',width=4))
plotSin2=graphWidget.plot(x,ySin2,pen=pg.mkPen('g',width=4))
plotSin3=graphWidget.plot(x,ySin3,pen=pg.mkPen('b',width=4))
graphWidget.setYRange(-1.25,1.25)

timer = QTimer()
timer.timeout.connect(updatePlot)
timer.start(100)

window.setLayout(layout)
window.show()
sys.exit(app.exec_())

import sys

import numpy as np

import pyqtgraph as pg

from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

numPoints = 200

xStart = 0

xStop = 4*np.pi

frequency = 1

Inc = (2*np.pi/numPoints)

count=0

incR=1

incG=2

x=np.linspace(xStart,xStop,numPoints)

ySin=np.sin(frequency*x)

ySin2 = np.sin(frequency*x + 2*np.pi/3)

ySin3 = np.sin(frequency*x + 4*np.pi/3)

def updatePlot():

global numPoint,xStart,xStop,Inc,frequency,count

xStart=xStart + Inc

xStop=xStop + Inc

x =np.linspace(xStart, xStop , numPoints)

ySin=np.sin(frequency*x+count*incR/100*frequency)

ySin2 = np.sin(frequency*x + 2*np.pi/3+count*incG/100*frequency)

ySin3 = np.sin(frequency*x + 4*np.pi/3)

plotSin.setData(x, ySin)

plotSin2.setData(x, ySin2)

plotSin3.setData(x, ySin3)

count=count+1

def updateFrequency(value):

global frequency, sliderLabel

frequency = value/10

sliderLabel.setText("Frequency: "+str(frequency)+" Hz")

app=QApplication(sys.argv)

window = QWidget()

window.setWindowTitle("The Magic of Sin Waves")

window.setGeometry(100,100,800,600)

layout = QVBoxLayout(window)

sliderLabel=QLabel("Frequency: 1 Hz")

sliderLabel.setStyleSheet("font-size: 40px;")

layout.addWidget(sliderLabel)

slider = QSlider(Qt.Horizontal)

slider.setMinimum(1)

slider.setMaximum(40)

slider.setValue(10)

slider.valueChanged.connect(updateFrequency)

layout.addWidget(slider)

graphWidget =pg.PlotWidget()

layout.addWidget(graphWidget)

plotSin=graphWidget.plot(x,ySin,pen=pg.mkPen('r',width=4))

plotSin2=graphWidget.plot(x,ySin2,pen=pg.mkPen('g',width=4))

plotSin3=graphWidget.plot(x,ySin3,pen=pg.mkPen('b',width=4))

graphWidget.setYRange(-1.25,1.25)

timer = QTimer()

timer.timeout.connect(updatePlot)

timer.start(100)

window.setLayout(layout)

window.show()

sys.exit(app.exec_())

Arduino

Portable Arduino Barometric Weather Station

March 13, 2025 admin

In this video lesson we take you through the project of building an Arduino Barometric Pressure Weather Station. It builds on the last two lessons in this series. We measure and display instantaneous Barometric Pressure, normalized to Sea Level. Then in the lower portion on the OLED SSD1306 display, we show a graph of the barometric pressure over the last 24 hours.

Arduino Altimeter — Schematic for the Portable Arduino Barometric Pressure Sensor

Below we include the code we develop in the above video. Make sure to set the ‘alt’ variable to your elevation at your location, in meters.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_BMP085.h>

int lastUpdate = 0;
int updateInterval = 600000;

float rawXdata[128];
int normXdata[128];

float rawYdata[128];
int normYdata[128];

float xMin = 0;
float xMax = 127;

float yMin = 28;
float yMax = 31;

float Pt = 14;
float Pb = 63;

float Pl = 0;
float Pr = 127;

int numPoints = 128;

Adafruit_BMP085 BP;
bool BMPconnected = false;

float BarPress = 30;
float BarPressNow = 30;
float alt = 1127;

int screenWidth = 128;
int screenHeight = 64;
int oledReset = -1;
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 oled(screenWidth, screenHeight, &Wire, oledReset);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  BMPconnected = BP.begin();
  if (BMPconnected == true) {
    Serial.println("BMP180 found and Connected");
  }
  if (BMPconnected == false) {
    Serial.println("BMP180 not found, Check Connections");
  }
  oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  oled.clearDisplay();
  oled.display();
  for (int i = 0; i < numPoints; i= i + 1) {
    rawXdata[i] = i;
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  BarPressNow = normPress(alt);
  BarPress = .95 * BarPress + .05 * BarPressNow;
  if (millis() - lastUpdate >= updateInterval) {
    for (int i = 0; i < numPoints - 1; i = i + 1) {
      rawYdata[i] = rawYdata[i + 1];

    }
    lastUpdate=millis();
    rawYdata[numPoints-1]=BarPress;
    normData();
    oled.clearDisplay();
    plotGraph();
  }
  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.setTextSize(2);
  oled.print(BarPress);
  oled.setTextSize(1);
  oled.println(" In HG");
  normData();
  plotGraph();
  oled.display();
  delay(.1);
}

float normPress(float elev) {
  float BPRaw;
  float BPNorm;
  float T0 = 288.15;
  float L = .0065;
  float R = 8.3144598;
  float M = .0289644;
  float g = 9.8;
  float c = M * g / (R * L);
  BPRaw = BP.readPressure() * .0002953;
  BPNorm = BPRaw / pow(1 - L * elev / T0, c);
  return BPNorm;
}
void normData() {
  for (int i = 0; i < numPoints; i = i + 1) {
    normYdata[i] = (Pb - Pt) / (yMin - yMax) * (rawYdata[i] - yMax) + Pt;
    normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;
  }
}
void plotGraph() {
  oled.drawLine(Pl, Pt, Pl, Pb, WHITE);
  oled.drawLine(Pl, Pb, Pr, Pb, WHITE);
  int MID = (Pb - Pt) / (yMin - yMax) * (29.92 - yMax) + Pt;
  oled.drawLine(Pl, MID, Pr, MID, WHITE);
  for (int i = 0; i < numPoints - 1; i = i + 1) {
    oled.drawLine(normXdata[i], normYdata[i], normXdata[i + 1], normYdata[i + 1], WHITE);
  }
}

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#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#include <Adafruit_BMP085.h>

int lastUpdate = 0;

int updateInterval = 600000;

float rawXdata[128];

int normXdata[128];

float rawYdata[128];

int normYdata[128];

float xMin = 0;

float xMax = 127;

float yMin = 28;

float yMax = 31;

float Pt = 14;

float Pb = 63;

float Pl = 0;

float Pr = 127;

int numPoints = 128;

Adafruit_BMP085 BP;

bool BMPconnected = false;

float BarPress = 30;

float BarPressNow = 30;

float alt = 1127;

int screenWidth = 128;

int screenHeight = 64;

int oledReset = -1;

#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 oled(screenWidth, screenHeight, &Wire, oledReset);

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

BMPconnected = BP.begin();

if (BMPconnected == true) {

Serial.println("BMP180 found and Connected");

}

if (BMPconnected == false) {

Serial.println("BMP180 not found, Check Connections");

}

oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

oled.clearDisplay();

oled.display();

for (int i = 0; i < numPoints; i= i + 1) {

rawXdata[i] = i;

}

void loop() {

// put your main code here, to run repeatedly:

BarPressNow = normPress(alt);

BarPress = .95 * BarPress + .05 * BarPressNow;

if (millis() - lastUpdate >= updateInterval) {

for (int i = 0; i < numPoints - 1; i = i + 1) {

rawYdata[i] = rawYdata[i + 1];

}

lastUpdate=millis();

rawYdata[numPoints-1]=BarPress;

normData();

oled.clearDisplay();

plotGraph();

}

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

oled.print(BarPress);

oled.setTextSize(1);

oled.println(" In HG");

normData();

plotGraph();

oled.display();

delay(.1);

}

float normPress(float elev) {

float BPRaw;

float BPNorm;

float T0 = 288.15;

float L = .0065;

float R = 8.3144598;

float M = .0289644;

float g = 9.8;

float c = M * g / (R * L);

BPRaw = BP.readPressure() * .0002953;

BPNorm = BPRaw / pow(1 - L * elev / T0, c);

return BPNorm;

}

void normData() {

for (int i = 0; i < numPoints; i = i + 1) {

normYdata[i] = (Pb - Pt) / (yMin - yMax) * (rawYdata[i] - yMax) + Pt;

normXdata[i] = (Pr - Pl) / (xMax - xMin) * (rawXdata[i] - xMin) + Pl;

}

void plotGraph() {

oled.drawLine(Pl, Pt, Pl, Pb, WHITE);

oled.drawLine(Pl, Pb, Pr, Pb, WHITE);

int MID = (Pb - Pt) / (yMin - yMax) * (29.92 - yMax) + Pt;

oled.drawLine(Pl, MID, Pr, MID, WHITE);

for (int i = 0; i < numPoints - 1; i = i + 1) {

oled.drawLine(normXdata[i], normYdata[i], normXdata[i + 1], normYdata[i + 1], WHITE);

}

Technology Tutorials

All posts by admin

Remotely Control a DC Motor Over WiFi With Raspberry Pi Pico W

Control DC Motor With Raspberry Pi Pico W and TA6586

Portable Arduino Weather Station Project

Plotting Live Data in Python Using PyQT

Portable Arduino Barometric Weather Station

Making The World a Better Place One High Tech Project at a Time. Enjoy!