Need help. Similer to LIN but not LIN?

Projects Networking, Protocols, and Devices
5

Looks like 7 LOW bits, 1 HIGH bit, and 6 bits of data. Or possibly 7 LOW bits and 7 bits of data.

You should get
7F (1111111) if there is a timeout.
49 (1001001) for the red oval button
6E (1101110) for the grey oval button
5B (1011011) for the grey round button

const byte CommPin = 4; // Pick a data pin

byte Receive()
{
  byte value = 0;
  unsigned long waitStart = millis();
  // Wait for the pin to go low or a timeout
  while (digitalRead(CommPin) == HIGH &&
         millis() - waitStart < 5000) {};

  // Since the non-delay() code takes some
  // time, we aim to start sampling a little
  // before the cengter of the 8th bit.
  delay(74);

  for (int i = 0; i < 7; i++)
  {
    value <<= 1;
    value += digitalRead(CommPin);
    delay(10);
  }
  return value;
}

void Send(byte value)
{
  // Send the 70ms of LOW
  pinMode(CommPin, OUTPUT);
  delay(70);

  for (int i = 6; i >= 0; i--)
  {
    if (value & _BV(i))
      pinMode(CommPin, INPUT); // HIGH
    else
      pinMode(CommPin, OUTPUT); // LOW
    delay(10);
  }

  pinMode(CommPin, INPUT); // idle HIGH
}

void setup()
{
  Serial.begin(115200);
  delay(200);

  pinMode(CommPin, INPUT);
  digitalWrite(CommPin, LOW);
}

void loop()
{
  Serial.println(Receive(), HEX);
}