Tag Archives: OLED

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:

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)

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!

#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;
}

#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;

}

Arduino

Using the SSD1306 OLED With an Arduino

January 23, 2025 admin

In this Video Tutorial we show you how to incorporate the SSD1306 OLED into your Arduino project. This is a versatile, low power display that makes it easy for you to incorporate a nice display into your Arduino projects. For this project, we connect the OLED via I2C. The schematic for our project is presented below:

Our physical build looked like this:

The video above shows in depth description of the code development, but for your convenience, we include the code below.

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

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);
oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
}

void loop() {
  // put your main code here, to run repeatedly:
oled.clearDisplay();
oled.display();
oled.setCursor(0,12);
oled.setTextColor(WHITE);
oled.setTextSize(3);
oled.println(" Hello");
oled.println(" World!");
oled.display();
delay(1000);
oled.invertDisplay(1);
delay(1000);
oled.invertDisplay(0);
delay(1000);

oled.clearDisplay();
oled.drawPixel(64,32,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.drawLine(0,0,127,63,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.drawLine(0,32,127,32,WHITE);
oled.drawLine(64,0,64,63,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.drawRect(0,0,128,64,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.fillRect(0,0,128,64,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.fillRect(0,0,128,64,WHITE);
oled.fillRect(5,5,118,54,BLACK);
oled.display();
delay(1000);

oled.clearDisplay();
oled.drawCircle(64,32,31,WHITE);
oled.display();
delay(1000);

oled.clearDisplay();
oled.fillCircle(64,32,31,WHITE);
oled.fillCircle(64,32,24,BLACK);
oled.display();
delay(1000);

}

#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

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);

oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

}

void loop() {

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

oled.clearDisplay();

oled.display();

oled.setCursor(0,12);

oled.setTextColor(WHITE);

oled.setTextSize(3);

oled.println(" Hello");

oled.println(" World!");

oled.display();

delay(1000);

oled.invertDisplay(1);

delay(1000);

oled.invertDisplay(0);

delay(1000);

oled.clearDisplay();

oled.drawPixel(64,32,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.drawLine(0,0,127,63,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.drawLine(0,32,127,32,WHITE);

oled.drawLine(64,0,64,63,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.drawRect(0,0,128,64,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.fillRect(0,0,128,64,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.fillRect(0,0,128,64,WHITE);

oled.fillRect(5,5,118,54,BLACK);

oled.display();

delay(1000);

oled.clearDisplay();

oled.drawCircle(64,32,31,WHITE);

oled.display();

delay(1000);

oled.clearDisplay();

oled.fillCircle(64,32,31,WHITE);

oled.fillCircle(64,32,24,BLACK);

oled.display();

delay(1000);

}

Arduino

Scan Arduino to Find I2C Addresses

November 26, 2024 admin

A challenge in many Arduino projects is that it can be difficult to get I2C components working properly. Many times the libraries and demonstration code indicate a certain I2C address for the component, but the Arduino is unable to find the component at that Address. This can be a challenge, because often times we might not have the exact same version of the component that is assumed in the libraries and code. A perfect example of this are the SSD1306 OLED displays. Many of the components look identical, but they can have different I2C addresses. In order to overcome this challenge, the following code allows you to scan your I2C Bus, and list the address of all the components found. Simply attach the component as instructed in the component documentation. Then run the following code. It will list the address of the I2C components it finds. Then you can edit the sample code to use the proper address. Enjoy!

#include <Wire.h>
#define myWire Wire
int numDevices;
byte error, address;
void setup() {
  myWire.begin();
  Serial.begin(9600);
  Serial.println("Find I2C Devices: ");
}
void loop() {
  Serial.println("Scanning...");
  numDevices = 0;
  for (address = 1; address < 127; address=address+1) {
    myWire.beginTransmission(address);
    error = myWire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println("  !");
      numDevices = numDevices + 1;
    } else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (numDevices == 0)
    Serial.println("No I2C devices found");
  delay(5000);  
}

#include <Wire.h>

#define myWire Wire

int numDevices;

byte error, address;

void setup() {

myWire.begin();

Serial.begin(9600);

Serial.println("Find I2C Devices: ");

}

void loop() {

Serial.println("Scanning...");

numDevices = 0;

for (address = 1; address < 127; address=address+1) {

myWire.beginTransmission(address);

error = myWire.endTransmission();

if (error == 0) {

Serial.print("I2C device found at address 0x");

if (address < 16)

Serial.print("0");

Serial.print(address, HEX);

Serial.println(" !");

numDevices = numDevices + 1;

} else if (error == 4) {

Serial.print("Unknown error at address 0x");

if (address < 16)

Serial.print("0");

Serial.println(address, HEX);

}

if (numDevices == 0)

Serial.println("No I2C devices found");

delay(5000);

}

Technology Tutorials

Tag Archives: OLED

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

Using the SSD1306 OLED With an Arduino

Scan Arduino to Find I2C Addresses

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