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Kod: Markera allt

#include <Wire.h>
#include <Adafruit_MCP23X17.h>
#include <U8g2lib.h>

Adafruit_MCP23X17 mcp0;
Adafruit_MCP23X17 mcp1;

//U8G2_SH1106_128X64_NONAME_F_HW_I2C oled(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); // Full buffer, 0x3C
U8G2_SH1106_128X64_NONAME_1_HW_I2C oled(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); // Page buffer, 0x3C

void setup() {
  delay(1000);
  Serial1.begin(115200);
  Wire.begin();
  Wire.setClock(50000); // i2c bus speed
 
  if (!mcp0.begin_I2C(0x20)) {
      Serial1.println("Error.");
    while (1);
  }


  if (!mcp1.begin_I2C(0x21)) {
      Serial1.println("Error.");
    while (1);
  }

  mcp0.pinMode(7,OUTPUT);
  mcp1.pinMode(7,OUTPUT);

  // Start sequence, 3 blink
  digitalWrite(7,LOW);
  for(int i=0;i<4;i++)
  {
    digitalWrite(7,HIGH);
    delay(100);  
    digitalWrite(7,LOW);
    delay(100);  
  }
  Serial1.println("ready");

  oled.begin();
  //oled.clearBuffer();
}

void loop() {
  mcp0.digitalWrite(7, HIGH);    // Orsakar låsning
  delay(200);
  //mcp1.digitalWrite(7, LOW);
  //delay(200);
  drawOLED(false);
  delay(200);
  Serial1.println("tick");

  digitalWrite(7,HIGH); // Heartbeat, pin 7 on uC

  mcp0.digitalWrite(7, LOW);     // Orsakar låsning
  delay(200);
  //mcp1.digitalWrite(7, HIGH);
  //delay(200);
  drawOLED(true);
  delay(200);
  Serial1.println("tack");

  digitalWrite(7,LOW); // Heartbeat, pin 7 on uC
}

void drawOLED(bool state)
{
    oled.firstPage();
    do {
      oled.setFont(u8g2_font_helvB08_tf); // // helvB08, 10, 12, 14, 18, 24 (helvb = bold, helvR = normal)
      if(state) {
        // MON
        oled.drawFrame(-1, 10, 13, 33);
        oled.drawStr(0, 20, "M");
        oled.drawStr(1, 30, "O");
        oled.drawStr(1, 40, "N");
        // MEM
        oled.drawFrame(116, 10, 13, 33);
        oled.drawStr(119, 20, "M");
        oled.drawStr(121, 30, "E");
        oled.drawStr(119, 40, "M");
        oled.drawHLine(0, 50, 128);
      }
      else {
      // MON
      oled.drawFrame(-1, 10, 13, 33);
      oled.drawStr(0, 20, "M");
      oled.drawStr(1, 30, "E");
      oled.drawStr(1, 40, "M");
      // MEM
      oled.drawFrame(116, 10, 13, 33);
      oled.drawStr(119, 20, "M");
      oled.drawStr(121, 30, "O");
      oled.drawStr(119, 40, "N");
      oled.drawHLine(0, 50, 128);        
      }
    } while (oled.nextPage());
}