KC868A-4 RF433MHz decoding.

[franco.demei@gmail.com]

press remote's button, is code can be detected, will print by serial port.

Hi Master,
I probably have a problem. I uploaded the belove  code. It's like a loop, I should read what i'm transmitting.

Code:

#include "BluetoothSerial.h"
#include <RCSwitch.h>
BluetoothSerial SerialBT;
RCSwitch mySwitch = RCSwitch();
#define Key1 36
#define Key2 39
#define Key3 27
#define Key4 14
#define RELAY1 2
#define RELAY2 15
#define RELAY3 5
#define RELAY4 4
int incoming;
void setup() {
     
  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, OUTPUT);
  pinMode(Key1, INPUT);
  pinMode(Key2, INPUT);
  pinMode(Key3, INPUT);
  pinMode(Key4, INPUT);
Serial.begin(9600);   // Serial monitor
mySwitch.enableReceive(19);
mySwitch.enableTransmit(21);
SerialBT.begin(9600); // Bluetooth serial communication
Serial.print("Bluetooth Control for KC868-A4 Relays");
 
}
void loop() {
 
      mySwitch.send("000000000001010100010001");
       delay(1000);
      mySwitch.send("000000000001010100010100");
        delay(1000);
 //if (mySwitch.available())
    // Read the received data
    Serial.print("Received ");
    Serial.print( mySwitch.getReceivedValue() );
    Serial.print(" / ");
    Serial.print( mySwitch.getReceivedBitlength() );
    Serial.print("bit ");
    Serial.print("Protocol: ");
    Serial.println( mySwitch.getReceivedProtocol() );
    mySwitch.resetAvailable();
      delay(1000);
   
  ScanKey1();
  ScanKey2();
  ScanKey3();
  ScanKey4();
if (SerialBT.available()) {
    char command = SerialBT.read();
   
    // Controlla il comando ricevuto e attiva o disattiva il relè corrispondente
    switch(command) {
      case '1':
        digitalWrite(RELAY1, HIGH);
        break;
      case '2':
        digitalWrite(RELAY1, LOW);
        break;
      case '3':
        digitalWrite(RELAY2, HIGH);
        break;
      case '4':
        digitalWrite(RELAY2, LOW);
        break;
      case '5':
        digitalWrite(RELAY3, HIGH);
        break;
      case '6':
        digitalWrite(RELAY3, LOW);
        break;
      case '7':
        digitalWrite(RELAY4, HIGH);
        break;
      case '8':
        digitalWrite(RELAY4, LOW);
        break;
      default:
        break;
    }
  }
}
int KEY_NUM1;
int KEY_NUM2;
int KEY_NUM3;
int KEY_NUM4;
void ScanKey1() {
  KEY_NUM1 = 1;
  if (digitalRead(Key1) == LOW) {
    delay(20);
    if (digitalRead(Key1) == LOW) {
      KEY_NUM1 = 0;
      digitalWrite(RELAY1, HIGH);
    } else {
      digitalWrite(RELAY1, LOW);
    }
  }
}
void ScanKey2() {
  KEY_NUM2 = 1;
  if (digitalRead(Key2) == LOW) {
    delay(20);
    if (digitalRead(Key2) == LOW) {
      KEY_NUM2 = 0;
      digitalWrite(RELAY2, HIGH);
    } else {
      digitalWrite(RELAY2, LOW);
    }
  }
}
void ScanKey3() {
  KEY_NUM3 = 1;
  if (digitalRead(Key3) == LOW) {
    delay(20);
    if (digitalRead(Key3) == LOW) {
      KEY_NUM3 = 0;
      digitalWrite(RELAY3, HIGH);
    } else {
      digitalWrite(RELAY3, LOW);
    }
  }
}
void ScanKey4() {
  KEY_NUM4 = 1;
  if (digitalRead(Key4) == LOW) {
    delay(20);
    if (digitalRead(Key4) == LOW) {
      KEY_NUM4 = 0;
      digitalWrite(RELAY4, HIGH);
    } else {
      digitalWrite(RELAY4, LOW);
    }
  }
}

With my oscilloscope, I made picture. The down CH, is what I'm sending (P4,Pin3). The upper CH is The out from U8, pin4 (RX Amplifier) That is connected straight to esp32 pin 31 (IO19).
As we can see from pictures There is not any output to the seial monitor.
Any suggestion to solve this issue ?