Tag Archives: SSD1306

Gearing Up for the Ultimate GPS Challenge

Guys in this class we will be building the Ultimate GPS Tracker. This will build on all you learned in our most excellent Raspberry Pi Pico W class, and now we will begin working on a real project. Hopefully most of the gear you will already have from the various kits you already have, but I give amazon links to the gear we will be using in the project. You Will Need:

Raspberry Pi Pico W: ORDER HERE
Adafruit Ultimate GPS: ORDER HERE
External Antenna (OPTIONAL): ORDER HERE
Button Battery For Quicker Fix: ORDER HERE
Soldering Iron: ORDER HERE
Solder Practice Components: ORDER HERE
Extra Solder: ORDER HERE
Safety Glasses: ORDER HERE
Breadvolt Power Supply (OPTIONAL): ORDER HERE
Charging Cable (If You Don’t Have): ORDER HERE
OLED SSD1306: (ORDER HERE)
Breadboard and Wires (If You Don’t Have): ORDER HERE

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

}

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.

Schematic for the Portable Arduino Barometric Pressure Sensor

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.

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);

}

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:

Schematic for Portable Distance Sensor Project

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:

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)
    time.sleep(.25)

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)

time.sleep(.25)

Technology Tutorials

Tag Archives: SSD1306

Getting Geared Up for the Ultimate GPS Tracker with Raspberry Pi Pico W

Portable Arduino Weather Station Project

Portable Arduino Barometric Weather Station

Plot any Data or Graph on any OLED

Portable Distance Measurement Project With HC-SR04 Ultrasonic Sensor

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