Slave

/*-----( Import needed libraries )-----*/
#include <SoftwareSerial.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define SSerialRX        10  //Serial Receive pin
#define SSerialTX        11  //Serial Transmit pin

#define SSerialTxControl 3   //RS485 Direction control
#define RS485Transmit   HIGH
#define RS485Receive     LOW

#define Pin13LED         13
int rele1 = 7;
/*-----( Declare objects )-----*/
SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX

/*-----( Declare Variables )-----*/
int byteReceived;
int byteSend;
int botao = 6;

void setup()   /****** SETUP: RUNS ONCE ******/
{
  // Start the built-in serial port, probably to Serial Monitor
  Serial.begin(9600);
  Serial.println("SerialRemote");  // Can be ignored
  pinMode(rele1, OUTPUT);
  pinMode(botao, INPUT_PULLUP);
  pinMode(Pin13LED, OUTPUT);
  pinMode(SSerialTxControl, OUTPUT);

  digitalWrite(SSerialTxControl, RS485Receive);  // Init Transceiver

  // Start the software serial port, to another device
  RS485Serial.begin(4800);   // set the data rate
}//--(end setup )---


void loop()   /****** LOOP: RUNS CONSTANTLY ******/
{
  int ler = digitalRead(botao);
  //Copy input data to output

  if (RS485Serial.available())
  {
    byteSend = RS485Serial.read();   // Read the byte

    digitalWrite(Pin13LED, HIGH);  // Show activity
    delay(10);
    digitalWrite(Pin13LED, LOW);

    if(byteSend == '1'){
      digitalWrite(rele1, HIGH);
    }
    if(byteSend == 'a'){
      digitalWrite(rele1, LOW);
    }
    digitalWrite(SSerialTxControl, RS485Transmit);  // Enable RS485 Transmit
    RS485Serial.write(byteSend); // Send the byte back
    delay(10);
    digitalWrite(SSerialTxControl, RS485Receive);  // Disable RS485 Transmit
//    delay(100);
  }// End If RS485SerialAvailable

}//--(end main loop )---

/*-----( Declare User-written Functions )-----*/
//NONE

//*********( THE END )***********