Tag Archives: Arduino

Arduino Uno R4 WiFi LESSON 36: Finding Average of an Array of Numbers on Arduino

September 25, 2024 admin

Below is the code we develop in the video above. It inputs an array of grades, it averages the grades, and then finds the High and Low Grades.

float grades[25];
int numGrades;
int i;
String myPrompt;

float bucket;
float avg;
float highGrade = 0;
float lowGrade = 100;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}
void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("How Many Grades? ");
  while (Serial.available() == 0) {
  }
  numGrades = Serial.parseInt();
  for (i = 0; i < numGrades; i = i + 1) {
    myPrompt = "Please Input Grade: " + String(i + 1);
    Serial.println(myPrompt);
    while (Serial.available() == 0) {
    }
    grades[i] = Serial.parseFloat();
  }
  Serial.println();
  Serial.println("Your Grades Are: ");
  for (i = 0; i < numGrades; i = i + 1) {
    Serial.println(grades[i]);
  }
  bucket=0;
  for (i = 0; i < numGrades; i = i + 1) {
    bucket = bucket + grades[i];
  }
  avg = bucket / numGrades;
  Serial.println("Your Average is: " + String(avg));
  highGrade=0;
  lowGrade=100;
  for (i=0;i<numGrades;i=i+1){
    if(grades[i]>highGrade){
      highGrade=grades[i];
    }
    if(grades[i]<lowGrade){
      lowGrade=grades[i];
    }
  }
  Serial.println("Your High Grade is: "+String(highGrade));
  Serial.println("Your Low Grade is: "+String(lowGrade));
  Serial.println();
}

float grades[25];

int numGrades;

int i;

String myPrompt;

float bucket;

float avg;

float highGrade = 0;

float lowGrade = 100;

void setup() {

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

Serial.begin(9600);

}

void loop() {

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

Serial.println("How Many Grades? ");

while (Serial.available() == 0) {

}

numGrades = Serial.parseInt();

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

myPrompt = "Please Input Grade: " + String(i + 1);

Serial.println(myPrompt);

while (Serial.available() == 0) {

}

grades[i] = Serial.parseFloat();

}

Serial.println();

Serial.println("Your Grades Are: ");

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

Serial.println(grades[i]);

}

bucket=0;

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

bucket = bucket + grades[i];

}

avg = bucket / numGrades;

Serial.println("Your Average is: " + String(avg));

highGrade=0;

lowGrade=100;

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

if(grades[i]>highGrade){

highGrade=grades[i];

}

if(grades[i]<lowGrade){

lowGrade=grades[i];

}

Serial.println("Your High Grade is: "+String(highGrade));

Serial.println("Your Low Grade is: "+String(lowGrade));

Serial.println();

}

Arduino

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

August 22, 2024 admin

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);

}

3D Graphics with Visual Python, Arduino with Python

Using an Arduino with Python LESSON 14: Model a Moving Marble in a Room Using Parameters

April 12, 2022 admin

In this lesson we show how to model a moving marble in vPython. We show how to create an animation where the marble bounces off the left and righty walls of our virtual room. For your convenience, we include the code below:

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

while True:
    rate(20)
    marbleX=marbleX+deltaX
    if marbleX+marbleR>(roomX/2-wallT/2) or marbleX-marbleR<(-roomX/2+wallT/2):
        deltaX=deltaX*(-1)
        marbleX=marbleX+deltaX
    marble.pos=vector(marbleX,0,0)

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

while True:

rate(20)

marbleX=marbleX+deltaX

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

deltaX=deltaX*(-1)

marbleX=marbleX+deltaX

marble.pos=vector(marbleX,0,0)

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)

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

Using an Arduino with Python LESSON 4: Visual Display of Measured Voltage in Visual Python

February 1, 2022 admin

In this lesson we show how you can measure a voltage from a potentiometer using Arduino, and then pass that data to Visual Python over the serial port. Then we use visual python to create a 3D model that is animated by the live data.

On the Arduino side we use the following code to measure the voltage from the potentiometer:

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 on the python side we read and display the data with the following code:

import time
import serial
from vpython import *
tube=cylinder(color=color.blue, radius=1, length=5, axis=vector(0,1,0))
lab=label(text='0 Volts',box=False)
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
    vol=(5./1023.)*potVal
    if vol==0:
        vol=.0001
    tube.length=vol
    vol=round(vol,1)
    lab.text=str(vol)+' Volts'

import time

import serial

from vpython import *

tube=cylinder(color=color.blue, radius=1, length=5, axis=vector(0,1,0))

lab=label(text='0 Volts',box=False)

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

vol=(5./1023.)*potVal

if vol==0:

vol=.0001

tube.length=vol

vol=round(vol,1)

lab.text=str(vol)+' Volts'

Watch the video for a complete explanation of the code.

Technology Tutorials

Tag Archives: Arduino

Arduino Uno R4 WiFi LESSON 36: Finding Average of an Array of Numbers on Arduino

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

Using an Arduino with Python LESSON 14: Model a Moving Marble in a Room Using Parameters

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

Using an Arduino with Python LESSON 4: Visual Display of Measured Voltage in Visual Python

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