// 8-channel relay on arduino serial control with permanent led blinking
// v0.1 under dwtwl 2.55
// ch1 = pin2; ch2 = pin3; ch3 = pin4; ch4 = pin5;
// ch5 = pin6; ch6 = pin7; ch7 = pin8; ch8 = pin9; led = pin13;
// send: switch on = 1X; switch off = 2X; get status = 3X;
// codes: in = init; eX = enabled; dX = disabled; tX = power on; fX = off;
#include <Thread.h>
Thread ledThread = Thread();

int incomingNumber = 0;

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  for(int i=2;i<10;i++){
    pinMode(i, OUTPUT);
    digitalWrite(i, HIGH);
  }
  Serial.println("in");

  ledThread.onRun(ledBlink);
  ledThread.setInterval(1000);
}

void ledBlink() {
  static bool ledStatus = false;
  ledStatus = !ledStatus;
  digitalWrite(13, ledStatus);
}

void loop() {
  // Thread init:
  if (ledThread.shouldRun())
    ledThread.run();
  
  if (Serial.available() > 0) {
    int incomingByte = Serial.read()-48;
    if (incomingByte>=0 && incomingByte<=9) {
      incomingNumber=incomingNumber*10+incomingByte;
    } else {
      if (incomingNumber>=10 && incomingNumber<=19) {
        delay(500);
        int currentPin = incomingNumber - 9;
        char currentChannel[] = "e0";
        currentChannel[1] = '0' + (currentPin - 1);
        digitalWrite(currentPin, LOW);
        Serial.println(currentChannel);
        delay(500);
      }
      
      if (incomingNumber>=20 && incomingNumber<=29) {
        delay(500);
        int currentPin = incomingNumber - 19;
        char currentChannel[] = "d0";
        currentChannel[1] = '0' + (currentPin - 1);
        digitalWrite(currentPin, HIGH);
        Serial.println(currentChannel);
        delay(500);
      }
      
      if (incomingNumber>=30 && incomingNumber<=39) {
        delay(500);
        int currentPin = incomingNumber - 29;
        if (digitalRead(currentPin)==HIGH) {
          char currentChannel[] = "f0";
          currentChannel[1] = '0' + (currentPin - 1);
          Serial.println(currentChannel);
        } else {
          char currentChannel[] = "t0";
          currentChannel[1] = '0' + (currentPin - 1);
          Serial.println(currentChannel);
        }
        delay(500);
      }
      incomingNumber = 0;
    }
  }
}