#include <Wire.h>

void setup()
{
  Wire.begin();
 
  Serial.begin(115200);
  Serial.println("\nI2C Scanner");
}
 
 
void loop()
{
  byte error, address;
  int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");
 
      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknow error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
 
  delay(5000);           // wait 5 seconds for next scan
}

// Wiring (Arduino UNO): VCC->5V, GND->GND, SDA->A4, SCL->A5
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// UNO I2C pins are fixed: SDA = A4, SCL = A5 (Wire uses them automatically)
const int SCREEN_WIDTH = 128;       // OLED width in pixels
const int SCREEN_HEIGHT = 32;       // OLED height in pixels - this module is 128x32
const uint8_t OLED_ADDRESS = 0x3C;  // ✏️ I2C address - if "not found", try 0x3D

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);  // -1 = no reset pin

int count = 0;

void setup() {
  Serial.begin(115200);                       // talk to the computer at 115200 baud
  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
    Serial.println("OLED not found - check wiring");
    while (true) { delay(10); }               // stop here
  }
  Serial.println("OK - epartners.co.nz test");

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);                     // small text: 21 characters x 4 lines
  display.setCursor(0, 0);
  display.println("Hello!");
  display.println("epartners.co.nz");
  display.display();                          // send the picture to the screen
  delay(5000);  // show epartners.co.nz for about 5 seconds
}

void loop() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("Counter");
  display.setTextSize(2);                     // ✏️ bigger text: 10 characters x 2 lines
  display.setCursor(0, 14);
  display.println(count);
  display.display();

  Serial.print("Count: ");
  Serial.println(count);
  count++;
  delay(1000);                                // ✏️ update every 1 second
}

// Wiring (ESP32 DevKitC): VCC->3V3, GND->GND, SDA->GPIO21, SCL->GPIO22
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const int SDA_PIN = 21;             // GPIO21 = SDA (I2C data)
const int SCL_PIN = 22;             // GPIO22 = SCL (I2C clock)
const int SCREEN_WIDTH = 128;       // OLED width in pixels
const int SCREEN_HEIGHT = 32;       // OLED height in pixels - this module is 128x32
const uint8_t OLED_ADDRESS = 0x3C;  // ✏️ I2C address - if "not found", try 0x3D

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);  // -1 = no reset pin

int count = 0;

void setup() {
  Serial.begin(115200);                       // talk to the computer at 115200 baud
  Wire.begin(SDA_PIN, SCL_PIN);               // start I2C on the pins above
  // last 'false' = Wire is already started, keep our pins
  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS, true, false)) {
    Serial.println("OLED not found - check wiring");
    while (true) { delay(10); }               // stop here
  }
  Serial.println("OK - epartners.co.nz test");

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);                     // small text: 21 characters x 4 lines
  display.setCursor(0, 0);
  display.println("Hello!");
  display.println("epartners.co.nz");
  display.display();                          // send the picture to the screen
  delay(5000);  // show epartners.co.nz for about 5 seconds
}

void loop() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("Counter");
  display.setTextSize(2);                     // ✏️ bigger text: 10 characters x 2 lines
  display.setCursor(0, 14);
  display.println(count);
  display.display();

  Serial.print("Count: ");
  Serial.println(count);
  count++;
  delay(1000);                                // ✏️ update every 1 second
}

from machine import Pin, I2C
i2c = I2C(0, sda=Pin(4), scl=Pin(5))  # GP4 = SDA, GP5 = SCL
print(i2c.scan())  # expect [60] - 60 is 0x3C

# Wiring (Pico): VCC->3V3(OUT) pin 36, GND->GND pin 38, SDA->GP4 pin 6, SCL->GP5 pin 7
from machine import Pin, I2C
import sys
import time
import ssd1306          # driver from micropython-lib, saved on the Pico as ssd1306.py

SDA_PIN = 4             # GP4 (pin 6) = SDA (I2C data)
SCL_PIN = 5             # GP5 (pin 7) = SCL (I2C clock)
WIDTH = 128             # OLED width in pixels
HEIGHT = 32             # OLED height in pixels - this module is 128x32
OLED_ADDRESS = 0x3C     # ✏️ I2C address - if "not found", try 0x3D

i2c = I2C(0, sda=Pin(SDA_PIN), scl=Pin(SCL_PIN), freq=400_000)

if OLED_ADDRESS not in i2c.scan():
    print("OLED not found - check wiring")
    sys.exit()

oled = ssd1306.SSD1306_I2C(WIDTH, HEIGHT, i2c, addr=OLED_ADDRESS)
print("OK - epartners.co.nz test")

oled.fill(0)                          # clear the screen
oled.text("Hello!", 0, 0)             # 8x8 font: 16 characters x 4 lines
oled.text("epartners.co.nz", 0, 10)
oled.show()                           # send the picture to the screen
time.sleep(5)  # show epartners.co.nz for about 5 seconds

count = 0
try:
    while True:
        oled.fill(0)
        oled.text("Counter", 0, 0)
        oled.text(str(count), 0, 16)
        oled.show()
        print("Count:", count)
        count += 1
        time.sleep(1)                 # ✏️ update every 1 second
except KeyboardInterrupt:
    oled.fill(0)                      # clear the screen when you press Stop
    oled.show()