Tag Archives: Arduino

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);

}

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.

#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);
  }
}

#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);

}

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)

Technology Tutorials

Tag Archives: Arduino

Portable Arduino Barometric Weather Station

Plot any Data or Graph on any OLED

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

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