Nano-485/Software/Sender/Sender.ino

/*
 *  Demonstrates how to use LCDisplay in conjunction with SoftRS485:
 *
 *  The main _loop_ of this program listens on the RS485 bus.
 *  Whenever a message is received from the bus, it is displayed on the LCD.
 */

// include the library code:
#include <SoftRS485.h>

#define PROGRAM "RS485-Nano 2.0 / Sender 1.0"

#define BTN_INT 2 // button interrupt pin
#define Max485_RO 3 // read-output of Max485
#define Max485_RE 5 // not-read-enable of Max485
#define Max485_DE 9 // data enable of Max485
#define Max485_DI 8 // data input of Max485

#define TRESHOLD 100000 // 100ms
#define ID 0
// 0=Test
// 1=Arbeitszimmer
// 2=Küche
// 3=Bad

//#define LOG_TO_SERIAL
#define SEND_485

boolean states[8];
unsigned long times[8];



void setup() {
  Serial.begin(115200);
  init485(Max485_RO,Max485_RE,Max485_DE,Max485_DI); // library initialization:
  pinMode(BTN_INT,INPUT_PULLUP);
  pinMode(14,INPUT_PULLUP);
  pinMode(15,INPUT_PULLUP);
  pinMode(16,INPUT_PULLUP);
  pinMode(17,INPUT_PULLUP);
  pinMode(18,INPUT_PULLUP);
  pinMode(19,INPUT_PULLUP);
  pinMode(20,INPUT_PULLUP);
  pinMode(21,INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(2),isr,CHANGE);
  // Print a message to the LCD.
  Serial.println(PROGRAM);
#ifdef LOG_TO_SERIAL
  Serial.println("14 15 16 17 18 19 20 21");
#endif
}

void isr(){
  states[0] = !digitalRead(14);
  states[1] = !digitalRead(15);
  states[2] = !digitalRead(16);
  states[3] = !digitalRead(17);

  states[4] = !digitalRead(18);
  states[5] = !digitalRead(19);
  states[6] = !(analogRead(20)>200);
  states[7] = !(analogRead(21)>200);
#ifdef LOG_TO_SERIAL
  for (int i=0;i<8;i++){
    Serial.print(" "); Serial.print(states[i]); Serial.print(" ");
  }
  Serial.println();
#endif
}

#ifdef SEND_485
void send(int btn){
  String s = "{nano:"+String(ID)+",btn:"+String(btn)+"}";
  for (int i = 0; i<10; i++){    
    if (send485(s.c_str())) break;
    Serial.println("collision detected, trying again:");
  }
}
#endif

void loop(){
  unsigned long now = micros();
  for (int i=0;i<8;i++){
    if (states[i]){
      if (now - times[i] > TRESHOLD){
#ifdef SEND_485
        send(i+1);
#endif
        times[i] = now;
      }
      states[i] = 0;
    }
  }
}