Tag Archives: OLED

Parsing GPS NMEA Sentences With the Raspberry Pi Pico W

July 22, 2025 admin

In this video lesson I show you how to parse NMEA sentences using the Raspberry Pi Pico W. In our project our pico is connected to the Adafruit Ultimate GPS V3. For this lesson we are using the following schematic:

Pi Pico GPS — This schematic shows how to connect the Adafruit Ultimate GPS to the Raspberry Pi Pico W

For your convenience, I have included the code below developed in the video:

# ====================================================================
# DISCLAIMER:
# This code is provided as-is for educational and experimental 
# purposes only. The author makes no representations or warranties of 
# any kind concerning the safety, suitability, or accuracy of this 
# code. Use at your own risk. The author assumes no liability for any 
# damages, system failures, security breaches, or network issues 
# resulting from the use or implementation of this script.
# ====================================================================

from machine import Pin,I2C,UART
import time
import _thread
dataLock = _thread.allocate_lock()
keepRunning = True
GPS = UART(1, baudrate=9600, tx=machine.Pin(8), rx=machine.Pin(9))
# The following line ensures that the GPS reports the GPVTG NMEA Sentence
GPS.write(b"$PMTK314,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n")
NMEAdata = {
    'GPGGA' : "",
    'GPGSA' : "",
    'GPRMC' : "",
    'GPVTG' : ""
    }
GPSdata = {
    'latDD' 	: 0,
    'lonDD'		: 0,
    'heading'	: 0,
    'fix'		: False,
    'sats'		: 0,
    'knots'		: 0
    }
def gpsThread():
    print("Thread Running")
    global keepRunning,NMEAdata
    GPGGA = ""
    GPGSA = ""
    GPRMC = ""
    GPVTG = ""
    while not GPS.any():
        pass
    while GPS.any():
        junk = GPS.read()
        print(junk)
    myNMEA = ""
    while keepRunning:
        if GPS.any():
            myChar=GPS.read(1).decode('utf-8')
            myNMEA = myNMEA + myChar
            if myChar == '\n':
                myNMEA = myNMEA.strip()
                if myNMEA[1:6] == "GPGGA":
                    GPGGA = myNMEA
                if myNMEA[1:6] == "GPGSA":
                    GPGSA = myNMEA
                if myNMEA[1:6] == "GPRMC":
                    GPRMC = myNMEA
                if myNMEA[1:6] == "GPVTG":
                    GPVTG = myNMEA
                if GPGGA != "" and GPGSA!="" and GPRMC!="" and GPVTG!="":
                    dataLock.acquire()
                    NMEAdata = {
                        'GPGGA' : GPGGA,
                        'GPGSA' : GPGSA,
                        'GPRMC' : GPRMC,
                        'GPVTG' : GPVTG
                        }
                    dataLock.release()
                myNMEA = ""
    print("Thread Terminated Cleanly")
def parseGPS():
    readFix=int(NMEAmain['GPGGA'].split(',')[6])
    if readFix !=0:
        GPSdata['fix'] = True
        latRAW = NMEAmain['GPGGA'].split(',')[2]
        latDD = int(latRAW[0:2]) + float(latRAW[2:])/60
        if NMEAmain['GPGGA'].split(',')[3] == 'S':
            latDD = -latDD
        GPSdata['latDD']= latDD
        lonRAW=NMEAmain['GPGGA'].split(',')[4]
        lonDD=int(lonRAW[0:3]) + float(lonRAW[3:])/60
        if NMEAmain['GPGGA'].split(',')[5] == 'W':
            lonDD = -lonDD
        GPSdata['lonDD'] = lonDD
        heading = float(NMEAmain['GPRMC'].split(',')[8])
        GPSdata['heading'] = heading
        knots = float(NMEAmain['GPRMC'].split(',')[7])
        GPSdata['knots'] = knots
        sats = NMEAmain['GPGGA'].split(',')[7]
        GPSdata['sats'] = sats
        
        
_thread.start_new_thread(gpsThread,())
ts=2
time.sleep(ts)
try:
    while True:
        dataLock.acquire()
        NMEAmain = NMEAdata.copy()
        dataLock.release()
        parseGPS()
        if GPSdata['fix'] == False:
            print("Waiting for Fix . . .")
        if GPSdata['fix'] == True:
            print("Ultimate GPS Tracker Report: ")
            print("Lat and Lon: ",GPSdata['latDD'],GPSdata['lonDD'])
            print("Knots: ",GPSdata['knots'])
            print("Heading: ",GPSdata['heading'])
            print("Sats: ",GPSdata['sats'])
            print()
        ts=10
        time.sleep(ts)
except KeyboardInterrupt:
    print("\nStopping Program . . . Cleaning Up UART")
    keepRunning = False
    ts=1
    time.sleep(ts)
    GPS.deinit()
    time.sleep(ts)
    print("Exited Cleanly")

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# ====================================================================

# DISCLAIMER:

# This code is provided as-is for educational and experimental

# purposes only. The author makes no representations or warranties of

# any kind concerning the safety, suitability, or accuracy of this

# code. Use at your own risk. The author assumes no liability for any

# damages, system failures, security breaches, or network issues

# resulting from the use or implementation of this script.

# ====================================================================

from machine import Pin,I2C,UART

import time

import _thread

dataLock = _thread.allocate_lock()

keepRunning = True

GPS = UART(1, baudrate=9600, tx=machine.Pin(8), rx=machine.Pin(9))

# The following line ensures that the GPS reports the GPVTG NMEA Sentence

GPS.write(b"$PMTK314,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n")

NMEAdata = {

'GPGGA' : "",

'GPGSA' : "",

'GPRMC' : "",

'GPVTG' : ""

}

GPSdata = {

'latDD' : 0,

'lonDD' : 0,

'heading' : 0,

'fix' : False,

'sats' : 0,

'knots' : 0

}

def gpsThread():

print("Thread Running")

global keepRunning,NMEAdata

GPGGA = ""

GPGSA = ""

GPRMC = ""

GPVTG = ""

while not GPS.any():

pass

while GPS.any():

junk = GPS.read()

print(junk)

myNMEA = ""

while keepRunning:

if GPS.any():

myChar=GPS.read(1).decode('utf-8')

myNMEA = myNMEA + myChar

if myChar == '\n':

myNMEA = myNMEA.strip()

if myNMEA[1:6] == "GPGGA":

GPGGA = myNMEA

if myNMEA[1:6] == "GPGSA":

GPGSA = myNMEA

if myNMEA[1:6] == "GPRMC":

GPRMC = myNMEA

if myNMEA[1:6] == "GPVTG":

GPVTG = myNMEA

if GPGGA != "" and GPGSA!="" and GPRMC!="" and GPVTG!="":

dataLock.acquire()

NMEAdata = {

'GPGGA' : GPGGA,

'GPGSA' : GPGSA,

'GPRMC' : GPRMC,

'GPVTG' : GPVTG

}

dataLock.release()

myNMEA = ""

print("Thread Terminated Cleanly")

def parseGPS():

readFix=int(NMEAmain['GPGGA'].split(',')[6])

if readFix !=0:

GPSdata['fix'] = True

latRAW = NMEAmain['GPGGA'].split(',')[2]

latDD = int(latRAW[0:2]) + float(latRAW[2:])/60

if NMEAmain['GPGGA'].split(',')[3] == 'S':

latDD = -latDD

GPSdata['latDD']= latDD

lonRAW=NMEAmain['GPGGA'].split(',')[4]

lonDD=int(lonRAW[0:3]) + float(lonRAW[3:])/60

if NMEAmain['GPGGA'].split(',')[5] == 'W':

lonDD = -lonDD

GPSdata['lonDD'] = lonDD

heading = float(NMEAmain['GPRMC'].split(',')[8])

GPSdata['heading'] = heading

knots = float(NMEAmain['GPRMC'].split(',')[7])

GPSdata['knots'] = knots

sats = NMEAmain['GPGGA'].split(',')[7]

GPSdata['sats'] = sats

_thread.start_new_thread(gpsThread,())

ts=2

time.sleep(ts)

try:

while True:

dataLock.acquire()

NMEAmain = NMEAdata.copy()

dataLock.release()

parseGPS()

if GPSdata['fix'] == False:

print("Waiting for Fix . . .")

if GPSdata['fix'] == True:

print("Ultimate GPS Tracker Report: ")

print("Lat and Lon: ",GPSdata['latDD'],GPSdata['lonDD'])

print("Knots: ",GPSdata['knots'])

print("Heading: ",GPSdata['heading'])

print("Sats: ",GPSdata['sats'])

print()

ts=10

time.sleep(ts)

except KeyboardInterrupt:

print("\nStopping Program . . . Cleaning Up UART")

keepRunning = False

ts=1

time.sleep(ts)

GPS.deinit()

time.sleep(ts)

print("Exited Cleanly")

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:

// ====================================================================
// DISCLAIMER:
// This code is provided as-is for educational and experimental 
// purposes only. The author makes no representations or warranties of 
// any kind concerning the safety, suitability, or accuracy of this 
// code. Use at your own risk. The author assumes no liability for any 
// damages, system failures, security breaches, or network issues 
// resulting from the use or implementation of this script.
// ====================================================================

#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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// ====================================================================

// DISCLAIMER:

// This code is provided as-is for educational and experimental

// purposes only. The author makes no representations or warranties of

// any kind concerning the safety, suitability, or accuracy of this

// code. Use at your own risk. The author assumes no liability for any

// damages, system failures, security breaches, or network issues

// resulting from the use or implementation of this script.

// ====================================================================

#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); //***********

}

Arduino

Plot any Data or Graph on any OLED

March 6, 2025 admin

In this video I show you how you can easily plot any graph or data onto any OLED display. We create a mathematical function which will map the raw data onto the screen. We demonstrate the function with a sin wave, but the function will work with any equation or data. This is the code which we developed in the video.

// ====================================================================
// DISCLAIMER:
// This code is provided as-is for educational and experimental 
// purposes only. The author makes no representations or warranties of 
// any kind concerning the safety, suitability, or accuracy of this 
// code. Use at your own risk. The author assumes no liability for any 
// damages, system failures, security breaches, or network issues 
// resulting from the use or implementation of this script.
// ====================================================================

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

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

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

float xMin = 0;
float xMax = 2 * 3.1415;

float yMin = -1;
float yMax = 1;

float Pt = 0;
float Pb = 63;

float Pl = 0;
float Pr = 127;

float pi = 3.14159265;

int numPoints = 128;

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

int j=0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  oled.clearDisplay();
  oled.display();
}
void loop() {
  // put your main code here, to run repeatedly:

  for (int i = 0; i < numPoints; i = i + 1) {
    rawXdata[i] = i * (2 * pi / 127);
    rawYdata[i] = sin(rawXdata[i]);
    Serial.println(rawYdata[i]);
    delay(100);
  }
normData();
plotGraph();
oled.display();
}

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);
  for (int i=0;i<numPoints-1;i=i+1){
  oled.drawLine(normXdata[i],normYdata[i],normXdata[i+1],normYdata[i+1],WHITE);
  }
}

// ====================================================================

// DISCLAIMER:

// This code is provided as-is for educational and experimental

// purposes only. The author makes no representations or warranties of

// any kind concerning the safety, suitability, or accuracy of this

// code. Use at your own risk. The author assumes no liability for any

// damages, system failures, security breaches, or network issues

// resulting from the use or implementation of this script.

// ====================================================================

#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

float rawXdata[128];

int normXdata[128];

float rawYdata[128];

int normYdata[128];

float xMin = 0;

float xMax = 2 * 3.1415;

float yMin = -1;

float yMax = 1;

float Pt = 0;

float Pb = 63;

float Pl = 0;

float Pr = 127;

float pi = 3.14159265;

int numPoints = 128;

int screenWidth = 128;

int screenHeight = 64;

int oledReset = -1;

#define SCREEN_ADDRESS 0x3C

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

int j=0;

void setup() {

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

Serial.begin(115200);

oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

oled.clearDisplay();

oled.display();

}

void loop() {

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

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

rawXdata[i] = i * (2 * pi / 127);

rawYdata[i] = sin(rawXdata[i]);

Serial.println(rawYdata[i]);

delay(100);

}

normData();

plotGraph();

oled.display();

}

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);

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

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

}

Raspberry Pi Pico

Portable Distance Measurement Project With HC-SR04 Ultrasonic Sensor

February 11, 2025 admin

In this video lesson we explore creating a portable distance measurement widget using the Raspberry Pi Pico W, the HC-SR04 Ultrasonic Sensor, and the SSD1306 OLED display.

The schematic we use for this project is as follows:

In this work, we use the State Machines on the Pi Pico to ensure precise timing. Below, we include the code developed in the lesson above:

# ====================================================================
# DISCLAIMER:
# This code is provided as-is for educational and experimental 
# purposes only. The author makes no representations or warranties of 
# any kind concerning the safety, suitability, or accuracy of this 
# code. Use at your own risk. The author assumes no liability for any 
# damages, system failures, security breaches, or network issues 
# resulting from the use or implementation of this script.
# ====================================================================

import rp2
from machine import Pin,I2C  #***************
import time
from ssd1306 import SSD1306_I2C  #**************

i2c2=I2C(1,sda=Pin(2), scl=Pin(3), freq=400000)
dsp=SSD1306_I2C(128,64,i2c2)

@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
def pulse_program():
    wrap_target()
    pull(block)
    mov(x,osr)
    set(pins,1)[31-1]
    set(pins,0)
    wait(1,pin,0)
    label("land")
    in_(pins,1) # 1 Cycle
    mov(y,isr)  # 1 Cycle
    jmp(not_y,"moveOn") # 1 Cycle
    jmp(x_dec,"land")  # 1 Cycle
    label("moveOn")
    mov(isr,invert(x))
    push()
    wrap()
triggerPin = Pin(18,Pin.OUT)
echoPin = Pin(19, Pin.IN)
sm=rp2.StateMachine(0,pulse_program, freq=1000000, set_base=triggerPin,in_base=echoPin)
sm.active(1)
while True:
    sm.put(0xFFFFFFFF)
    print("Pulse Launched")
    clockCycles=(sm.get())*4/2
    distance=clockCycles*.0342
    print("Distance to Target: ",distance)
    dsp.text("Distance: "+str(distance),0,16)
    dsp.show()
    dsp.fill(0)
    ts=.25
    time.sleep(ts)

# ====================================================================

# DISCLAIMER:

# This code is provided as-is for educational and experimental

# purposes only. The author makes no representations or warranties of

# any kind concerning the safety, suitability, or accuracy of this

# code. Use at your own risk. The author assumes no liability for any

# damages, system failures, security breaches, or network issues

# resulting from the use or implementation of this script.

# ====================================================================

import rp2

from machine import Pin,I2C #***************

import time

from ssd1306 import SSD1306_I2C #**************

i2c2=I2C(1,sda=Pin(2), scl=Pin(3), freq=400000)

dsp=SSD1306_I2C(128,64,i2c2)

@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)

def pulse_program():

wrap_target()

pull(block)

mov(x,osr)

set(pins,1)[31-1]

set(pins,0)

wait(1,pin,0)

label("land")

in_(pins,1) # 1 Cycle

mov(y,isr) # 1 Cycle

jmp(not_y,"moveOn") # 1 Cycle

jmp(x_dec,"land") # 1 Cycle

label("moveOn")

mov(isr,invert(x))

push()

wrap()

triggerPin = Pin(18,Pin.OUT)

echoPin = Pin(19, Pin.IN)

sm=rp2.StateMachine(0,pulse_program, freq=1000000, set_base=triggerPin,in_base=echoPin)

sm.active(1)

while True:

sm.put(0xFFFFFFFF)

print("Pulse Launched")

clockCycles=(sm.get())*4/2

distance=clockCycles*.0342

print("Distance to Target: ",distance)

dsp.text("Distance: "+str(distance),0,16)

dsp.show()

dsp.fill(0)

ts=.25

time.sleep(ts)

Arduino

Arduino Project for a Portable Ultrasonic Distance Sensor

January 30, 2025 admin

In this video lesson we create a portable distance measuring prototype, using an Arduino Uno R4 WiFi. This project incorporates a HC-SR04 Ultrasonic Sensor, a ‘Go’ button, and the SSD1306 OLED Display. The project is powered by the Sunfounder Breadboard power bank. The arduino is powered by the power bank as well, so the project can operate totally portable. When the device is turned on, the OLED prompts the user to position the device. When the ‘Go’ button is pushed, the device measures the distance to the target, then displays the distance on the OLED display.

Schematic of the Portable Arduino Uno R4 WiFi Distance Sensor

The video above gives all the details of the project, with step-by-step instructions.

For your convenience, the code developed in the video is presented below. Enjoy!

// ====================================================================
// DISCLAIMER:
// This code is provided as-is for educational and experimental 
// purposes only. The author makes no representations or warranties of 
// any kind concerning the safety, suitability, or accuracy of this 
// code. Use at your own risk. The author assumes no liability for any 
// damages, system failures, security breaches, or network issues 
// resulting from the use or implementation of this script.
// ====================================================================

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

int butPin = 2;
int butVal = 1;
int butValOld = 1;

int trigPin = 4;
int echoPin = 3;
int pingTime;
float targDist;
int ft;
float in;

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);
  pinMode(butPin, INPUT_PULLUP);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  oled.clearDisplay();
  oled.display();
}
void loop() {
  // put your main code here, to run repeatedly:
  oled.setCursor(0, 12);
  oled.setTextColor(WHITE);
  oled.setTextSize(1);
  oled.println("Point the ");
  oled.println("DistoMatic at");
  oled.println("Target and Press");
  oled.println("Go");
  oled.display();
  butVal = digitalRead(butPin);
  if (butValOld == 0 && butVal == 1) {
    targDist = findDistance();
    ft = targDist/12;
    in = targDist - ft*12;
    oled.clearDisplay();
    oled.setCursor(0, 0);
    oled.setTextColor(WHITE);
    oled.setTextSize(2);
    Serial.println(targDist);
    Serial.println(ft);
    Serial.println(in);
    oled.println(String(ft)+" Ft.");
    oled.println(String(in)+" In.");
    oled.display();
    delay(5000);
    oled.clearDisplay();
    oled.display();
  }
  butValOld = butVal;
}

float findDistance() {
  float d;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  d = pulseIn(echoPin, HIGH) / 2. * .0135;
  return d;
}

// ====================================================================

// DISCLAIMER:

// This code is provided as-is for educational and experimental

// purposes only. The author makes no representations or warranties of

// any kind concerning the safety, suitability, or accuracy of this

// code. Use at your own risk. The author assumes no liability for any

// damages, system failures, security breaches, or network issues

// resulting from the use or implementation of this script.

// ====================================================================

#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

int butPin = 2;

int butVal = 1;

int butValOld = 1;

int trigPin = 4;

int echoPin = 3;

int pingTime;

float targDist;

int ft;

float in;

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);

pinMode(butPin, INPUT_PULLUP);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

oled.clearDisplay();

oled.display();

}

void loop() {

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

oled.setCursor(0, 12);

oled.setTextColor(WHITE);

oled.setTextSize(1);

oled.println("Point the ");

oled.println("DistoMatic at");

oled.println("Target and Press");

oled.println("Go");

oled.display();

butVal = digitalRead(butPin);

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

targDist = findDistance();

ft = targDist/12;

in = targDist - ft*12;

oled.clearDisplay();

oled.setCursor(0, 0);

oled.setTextColor(WHITE);

oled.setTextSize(2);

Serial.println(targDist);

Serial.println(ft);

Serial.println(in);

oled.println(String(ft)+" Ft.");

oled.println(String(in)+" In.");

oled.display();

delay(5000);

oled.clearDisplay();

oled.display();

}

butValOld = butVal;

}

float findDistance() {

float d;

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

d = pulseIn(echoPin, HIGH) / 2. * .0135;

return d;

}

Technology Tutorials

Tag Archives: OLED

Parsing GPS NMEA Sentences With the Raspberry Pi Pico W

Portable Arduino Weather Station Project

Plot any Data or Graph on any OLED

Portable Distance Measurement Project With HC-SR04 Ultrasonic Sensor

Arduino Project for a Portable Ultrasonic Distance Sensor

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