Nano-485/Software/TempSender/TempSender.ino

/*
 *  Demonstrates how to use Read Buttons in conjunction with SoftRS485:
 *
 * If a button is pressed, a corresponding flag is set.
 * The main loop checks for the state of those flags and
 * sends a message on the RS485 bus whenever a flag is set.
 */

// include the library code:
#include <SoftRS485.h>
#include <AM2302-Sensor.h>

#define PROGRAM "RS485-Nano 2.1 / TempSender 1.1"

#define BTN_INT 3 // button interrupt pin
#define Max485_RO 2 // read-output of Max485
#define Max485_RE 3 // not-read-enable of Max485
#define Max485_DE 8 // data enable of Max485
#define Max485_DI 9 // data input of Max485
#define DHT_PIN 4
#define TRESHOLD 100000 // 100ms
#define PERIOD   100000000 // 100s
#define ID 3
// 0=Test
// 1=Arbeitszimmer
// 2=Küche
// 3=Bad

//#define LOG_TO_SERIAL
#define SEND_485

AM2302::AM2302_Sensor am2302{DHT_PIN};

boolean states[8];
unsigned long times[8];
unsigned long sensor_time = PERIOD;


void setup(){
  Serial.begin(115200);
  am2302.begin();
  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,FALLING);
  // 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]){
      delay(1);
      if (now - times[i] > TRESHOLD){
#ifdef SEND_485
        send(i+1);
#endif
        times[i] = now;
      }
      states[i] = 0;
    }
  }

  if (now - sensor_time > PERIOD){
    sensor_time = now;
    auto status = am2302.read();
    if (status == 0){
      String s = "{nano:"+String(ID)+",temp:"+String(am2302.get_Temperature())+",humi:"+String(am2302.get_Hunidity())+"}";
      send485(s.c_str());
#ifdef LOG_TO_SERIAL
      Serial.println(s);
#endif
    }
  }
  
}