Category Archives: Arduino

In this video lesson we show you how to measure temperature and humidity using the DHT11 sensor. For your convenience, we include the code below which we develop in the above video. Enjoy!

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

int br=115200;
int setUpDelay=1000;
int measDelay=1000;

float tempC;
float tempF;
float hum;
float HIF;
float HIC;

String message;

void setup() {
  // put your setup code here, to run once:
Serial.begin(br);
myDHT.begin();
delay(setUpDelay);
}

void loop() {
  // put your main code here, to run repeatedly:
tempC=myDHT.readTemperature(false);
tempF=myDHT.readTemperature(true);
hum=myDHT.readHumidity();
if (isnan(tempC) || isnan(tempF) || isnan(hum)){
  Serial.println("Failed to Read Data on DHT11");
  return;
}
HIC=myDHT.computeHeatIndex(tempC,hum,false);
HIF=myDHT.computeHeatIndex(tempF,hum,true);
message="Temp: "+String(tempC)+" deg C "+String(tempF)+" deg F Humidity: "+String(hum)+" % Heat Index: "+String(HIC)+" deg C "+String(HIF)+" deg F.";
Serial.println(message);
// Serial.print("Temp: ");
// Serial.print(tempC);
// Serial.print(" deg C ");
// Serial.print(tempF);
// Serial.print(" deg F ");
// Serial.print("Humidity: ");
// Serial.print(hum);
// Serial.print(" % ");
// Serial.print("Heat Index: ");
// Serial.print(HIC);
// Serial.print(" deg C ");
// Serial.print(HIF);
// Serial.println(" deg F ");


delay(measDelay);
}

#include <DHT.h>

#define DHTPIN 11

#define DHTTYPE DHT11

DHT myDHT(DHTPIN,DHTTYPE);

int br=115200;

int setUpDelay=1000;

int measDelay=1000;

float tempC;

float tempF;

float hum;

float HIF;

float HIC;

String message;

void setup() {

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

Serial.begin(br);

myDHT.begin();

delay(setUpDelay);

}

void loop() {

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

tempC=myDHT.readTemperature(false);

tempF=myDHT.readTemperature(true);

hum=myDHT.readHumidity();

if (isnan(tempC) || isnan(tempF) || isnan(hum)){

Serial.println("Failed to Read Data on DHT11");

return;

}

HIC=myDHT.computeHeatIndex(tempC,hum,false);

HIF=myDHT.computeHeatIndex(tempF,hum,true);

message="Temp: "+String(tempC)+" deg C "+String(tempF)+" deg F Humidity: "+String(hum)+" % Heat Index: "+String(HIC)+" deg C "+String(HIF)+" deg F.";

Serial.println(message);

// Serial.print("Temp: ");

// Serial.print(tempC);

// Serial.print(" deg C ");

// Serial.print(tempF);

// Serial.print(" deg F ");

// Serial.print("Humidity: ");

// Serial.print(hum);

// Serial.print(" % ");

// Serial.print("Heat Index: ");

// Serial.print(HIC);

// Serial.print(" deg C ");

// Serial.print(HIF);

// Serial.println(" deg F ");

delay(measDelay);

}

Arduino

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

August 8, 2024 admin

In this video lesson we create a bouncing pixel on the Arduino Uno R4 LED Matrix. For your convenience we include the code developed in the video below.

#include "Arduino_LED_Matrix.h"
ArduinoLEDMatrix matrix;

int br=115200;
int dt=50;
int xPos=3;
int yPos=2;
int deltaX=1;
int deltaY=1;

int i;
int j;

byte frame[8][12];

void setup() {
  // put your setup code here, to run once:
Serial.begin(br);
matrix.begin();
}
void loop() {
  // put your main code here, to run repeatedly:
for ( i=0;i<=11;i=i+1){
  for (j=0;j<=7;j=j+1){
    frame[j][i]=0;
    if (i==xPos && j==yPos){
      frame[j][i]=1;
    }
  }
}
matrix.renderBitmap(frame,8,12);
if (xPos>=11 || xPos<=0){
  deltaX=-deltaX;
}
if (yPos>=7 || yPos<=0){
  deltaY=-deltaY;
}
xPos=xPos+deltaX;
yPos=yPos+deltaY;
delay(dt);
}

#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

int br=115200;

int dt=50;

int xPos=3;

int yPos=2;

int deltaX=1;

int deltaY=1;

int i;

int j;

byte frame[8][12];

void setup() {

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

Serial.begin(br);

matrix.begin();

}

void loop() {

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

for ( i=0;i<=11;i=i+1){

for (j=0;j<=7;j=j+1){

frame[j][i]=0;

if (i==xPos && j==yPos){

frame[j][i]=1;

}

matrix.renderBitmap(frame,8,12);

if (xPos>=11 || xPos<=0){

deltaX=-deltaX;

}

if (yPos>=7 || yPos<=0){

deltaY=-deltaY;

}

xPos=xPos+deltaX;

yPos=yPos+deltaY;

delay(dt);

}

3D Graphics with Visual Python, Arduino, Arduino with Python

Using an Arduino with Python LESSON 15: Model of Bouncing Marble in 3D Room

April 19, 2022 admin

In this video lesson we model a 3D room, and have a marble bouncing around in the room, off of each of the six walls. Below we include the code we develop in the video above

from vpython import *
roomX=12
roomY=10
roomZ=16
wallT=.5
wallColor=vector(1,1,1)
wallOpacity=.8
frontOpacity=.1
marbleR=.5
ballColor=vector(0,0,1)

myFloor=box(size=vector(roomX,wallT,roomZ),pos=vector(0,-roomY/2,0),color=wallColor,opacity=wallOpacity)
myCeiling=box(size=vector(roomX,wallT,roomZ),pos=vector(0,roomY/2,0),color=wallColor,opacity=wallOpacity)
leftWall=box(size=vector(wallT,roomY,roomZ),pos=vector(-roomX/2,0,0),color=wallColor,opacity=wallOpacity)
rightWall=box(size=vector(wallT,roomY,roomZ),pos=vector(roomX/2,0,0),color=wallColor,opacity=wallOpacity)
backWall=box(size=vector(roomX,roomY,wallT),pos=vector(0,0,-roomZ/2),color=wallColor,opacity=wallOpacity)
frontWall=box(size=vector(roomX,roomY,wallT),pos=vector(0,0,roomZ/2),color=wallColor,opacity=frontOpacity)
marble=sphere(color=ballColor,radius=marbleR)

marbleX=0
deltaX=.1

marbleY=0
deltaY=.1

marbleZ=0
deltaZ=.1

while True:
    rate(20)

    marbleX=marbleX+deltaX
    marbleY=marbleY+deltaY
    marbleZ=marbleZ+deltaZ


    if marbleX+marbleR>(roomX/2-wallT/2) or marbleX-marbleR<(-roomX/2+wallT/2):
        deltaX=deltaX*(-1)
        marbleX=marbleX+deltaX

    if marbleY+marbleR>(roomY/2-wallT/2) or marbleY-marbleR<(-roomY/2+wallT/2):
        deltaY=deltaY*(-1)
        marbleY=marbleY+deltaY

    if marbleZ+marbleR>(roomZ/2-wallT/2) or marbleZ-marbleR<(-roomZ/2+wallT/2):
        deltaZ=deltaZ*(-1)
        marbleZ=marbleZ+deltaZ

    marble.pos=vector(marbleX,marbleY,marbleZ)

from vpython import *

roomX=12

roomY=10

roomZ=16

wallT=.5

wallColor=vector(1,1,1)

wallOpacity=.8

frontOpacity=.1

marbleR=.5

ballColor=vector(0,0,1)

myFloor=box(size=vector(roomX,wallT,roomZ),pos=vector(0,-roomY/2,0),color=wallColor,opacity=wallOpacity)

myCeiling=box(size=vector(roomX,wallT,roomZ),pos=vector(0,roomY/2,0),color=wallColor,opacity=wallOpacity)

leftWall=box(size=vector(wallT,roomY,roomZ),pos=vector(-roomX/2,0,0),color=wallColor,opacity=wallOpacity)

rightWall=box(size=vector(wallT,roomY,roomZ),pos=vector(roomX/2,0,0),color=wallColor,opacity=wallOpacity)

backWall=box(size=vector(roomX,roomY,wallT),pos=vector(0,0,-roomZ/2),color=wallColor,opacity=wallOpacity)

frontWall=box(size=vector(roomX,roomY,wallT),pos=vector(0,0,roomZ/2),color=wallColor,opacity=frontOpacity)

marble=sphere(color=ballColor,radius=marbleR)

marbleX=0

deltaX=.1

marbleY=0

deltaY=.1

marbleZ=0

deltaZ=.1

while True:

rate(20)

marbleX=marbleX+deltaX

marbleY=marbleY+deltaY

marbleZ=marbleZ+deltaZ

if marbleX+marbleR>(roomX/2-wallT/2) or marbleX-marbleR<(-roomX/2+wallT/2):

deltaX=deltaX*(-1)

marbleX=marbleX+deltaX

if marbleY+marbleR>(roomY/2-wallT/2) or marbleY-marbleR<(-roomY/2+wallT/2):

deltaY=deltaY*(-1)

marbleY=marbleY+deltaY

if marbleZ+marbleR>(roomZ/2-wallT/2) or marbleZ-marbleR<(-roomZ/2+wallT/2):

deltaZ=deltaZ*(-1)

marbleZ=marbleZ+deltaZ

marble.pos=vector(marbleX,marbleY,marbleZ)

3D Graphics with Visual Python, Arduino, Arduino with Python, Python

Using an Arduino with Python LESSON 8: Live Thermometer 3D Visual Using DHT11

March 1, 2022 admin

In this video lesson we connect the Arduino to a DHT11 temperature and humidity sensor. We show how to wire the device up, and then how to code the Arduino. The data is passed from the Arduino to python. We then create a live 3D thermometer model that updates as the temperature changes.

On the arduino side, this is the code which we use:

#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT11

float tempF;
float tempC;
float humidity;

int setTime=500;
int dt=1000;

DHT TH(DHTPIN,DHTTYPE);

void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
TH.begin();
delay(setTime);
}
void loop() {
  // put your main code here, to run repeatedly:
tempC=TH.readTemperature();
tempF=TH.readTemperature(true);
humidity=TH.readHumidity();


Serial.print(tempF);
Serial.print(",");
Serial.println(humidity);

delay(dt);
}

#include "DHT.h"

#define DHTPIN 2

#define DHTTYPE DHT11

float tempF;

float tempC;

float humidity;

int setTime=500;

int dt=1000;

DHT TH(DHTPIN,DHTTYPE);

void setup() {

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

Serial.begin(115200);

TH.begin();

delay(setTime);

}

void loop() {

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

tempC=TH.readTemperature();

tempF=TH.readTemperature(true);

humidity=TH.readHumidity();

Serial.print(tempF);

Serial.print(",");

Serial.println(humidity);

delay(dt);

}

Then on the python side, we use the following code:

import time
import serial
from vpython import *

arduinoData=serial.Serial('com3',115200)
time.sleep(.5)
digValue=label(text='50',height=20,box=False,pos=vector(0,-2.5,2))
bulb=sphere(radius=1,color=color.red,pos=vector(0,-3,0))
cyl=cylinder(radius=.6,color=color.red,axis=vector(0,1,0),length=6,pos=vector(0,-3,0))
bulbGlass=sphere(radius=1.2,color=color.white,opacity=.25,pos=vector(0,-3,0))
cylGlass=cylinder(radius=.8,color=color.white,axis=vector(0,1,0),opacity=.25,length=6,pos=vector(0,-3,0))
for temp in range(0,115,10):
    tickPos=4.5/115*temp+1.5
    tick=cylinder(radius=.7,color=color.black,length=.1,axis=vector(0,1,0),pos=vector(0,tickPos-3,0))
    label=text(text=str(temp),color=color.white,pos=vector(-2,tickPos-3,0),height=.3)
while True:
    while arduinoData.in_waiting==0:
        pass
    dataPacket=arduinoData.readline()
    dataPacket=str(dataPacket,'utf-8')
    dataPacket=dataPacket.strip('\r\n')
    dataPacket=dataPacket.split(',')
    temp=float(dataPacket[0])
    hum=float(dataPacket[1])
    len=(4.5/115)*temp+1.5
    cyl.length=len
    digValue.text=str(temp)

import time

import serial

from vpython import *

arduinoData=serial.Serial('com3',115200)

time.sleep(.5)

digValue=label(text='50',height=20,box=False,pos=vector(0,-2.5,2))

bulb=sphere(radius=1,color=color.red,pos=vector(0,-3,0))

cyl=cylinder(radius=.6,color=color.red,axis=vector(0,1,0),length=6,pos=vector(0,-3,0))

bulbGlass=sphere(radius=1.2,color=color.white,opacity=.25,pos=vector(0,-3,0))

cylGlass=cylinder(radius=.8,color=color.white,axis=vector(0,1,0),opacity=.25,length=6,pos=vector(0,-3,0))

for temp in range(0,115,10):

tickPos=4.5/115*temp+1.5

tick=cylinder(radius=.7,color=color.black,length=.1,axis=vector(0,1,0),pos=vector(0,tickPos-3,0))

label=text(text=str(temp),color=color.white,pos=vector(-2,tickPos-3,0),height=.3)

while True:

while arduinoData.in_waiting==0:

pass

dataPacket=arduinoData.readline()

dataPacket=str(dataPacket,'utf-8')

dataPacket=dataPacket.strip('\r\n')

dataPacket=dataPacket.split(',')

temp=float(dataPacket[0])

hum=float(dataPacket[1])

len=(4.5/115)*temp+1.5

cyl.length=len

digValue.text=str(temp)

3D Graphics with Visual Python, Arduino, Arduino with Python

Using an Arduino with Python LESSON 5: Analog Voltage Meter in vPython

February 8, 2022 admin

In this lesson we begin coding a 3D analog voltmeter model in vPython. We begin by connecting a potentiometer to an arduino to create a voltage divider. The voltage is read from the center tap of the potentiometer by the arduino, and then the arduino passes the data to python. Then, we animate the analog voltmeter based on the readings passed from the Arduino. Enjoy!

int potPin=A0;
int DL=100;
int potVal;
void setup() {
  // put your setup code here, to run once:
pinMode(potPin,INPUT);
Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
potVal=analogRead(potPin);
Serial.println(potVal);
delay(DL);
}

int potPin=A0;

int DL=100;

int potVal;

void setup() {

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

pinMode(potPin,INPUT);

Serial.begin(115200);

}

void loop() {

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

potVal=analogRead(potPin);

Serial.println(potVal);

delay(DL);

}

Then this is the code we developed for the Python side.

import time
import serial
from vpython import *
import numpy as np

arrowLength=1
arrowWidth=.02
myArrow=arrow(length=arrowLength,shaftwidth=arrowWidth,color=color.red,axis=vector(1,1,0))

tickL=.1
tickW=.02
tickH=.02

for theta in np.linspace(5*np.pi/6,np.pi/6,6):
    tickMajor=box(color=color.black,pos=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0),size=vector(tickL,tickW,tickH),axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0))


boxX=2.5
boxY=1.5
boxZ=.1
myCase=box(color=color.white,size=vector(boxX,boxY,boxZ),pos=vector(0,.9*boxY/2,-boxZ))

arduinoData=serial.Serial('com3',115200)
time.sleep(1)
while True:
    while arduinoData.in_waiting==0:
        pass
    dataPacket=arduinoData.readline()
    dataPacket=str(dataPacket,'utf-8')
    dataPacket=dataPacket.strip('\r\n')
    dataPacket=int(dataPacket)
    potVal=dataPacket
    theta=-2*np.pi/3069*potVal+5*np.pi/6
    myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)

    # for theta in np.linspace(5*np.pi/6,np.pi/6,150):
    #     rate(25)
    #     myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)
    
    # for theta in np.linspace(np.pi/6,5*np.pi/6,150):
    #     rate(25)
    #     myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)

import time

import serial

from vpython import *

import numpy as np

arrowLength=1

arrowWidth=.02

myArrow=arrow(length=arrowLength,shaftwidth=arrowWidth,color=color.red,axis=vector(1,1,0))

tickL=.1

tickW=.02

tickH=.02

for theta in np.linspace(5*np.pi/6,np.pi/6,6):

tickMajor=box(color=color.black,pos=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0),size=vector(tickL,tickW,tickH),axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0))

boxX=2.5

boxY=1.5

boxZ=.1

myCase=box(color=color.white,size=vector(boxX,boxY,boxZ),pos=vector(0,.9*boxY/2,-boxZ))

arduinoData=serial.Serial('com3',115200)

time.sleep(1)

while True:

while arduinoData.in_waiting==0:

pass

dataPacket=arduinoData.readline()

dataPacket=str(dataPacket,'utf-8')

dataPacket=dataPacket.strip('\r\n')

dataPacket=int(dataPacket)

potVal=dataPacket

theta=-2*np.pi/3069*potVal+5*np.pi/6

myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)

# for theta in np.linspace(5*np.pi/6,np.pi/6,150):

# rate(25)

# myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)

# for theta in np.linspace(np.pi/6,5*np.pi/6,150):

# rate(25)

# myArrow.axis=vector(arrowLength*np.cos(theta),arrowLength*np.sin(theta),0)

Technology Tutorials

Category Archives: Arduino

Using the Arduino Uno R4 Wifi to Measure Temperature and Humidity With the DHT11

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

Using an Arduino with Python LESSON 15: Model of Bouncing Marble in 3D Room

Using an Arduino with Python LESSON 8: Live Thermometer 3D Visual Using DHT11

Using an Arduino with Python LESSON 5: Analog Voltage Meter in vPython

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