#define TX_PIN 21
#define RX_PIN 20
int ir=6;
void setup() {
    Serial.begin(115200);     
    Serial1.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN); 

pinMode(ir,INPUT);
}

void loop() {
 int value= digitalRead(ir);
    Serial1.println(value); 
    Serial.print("Sent:ir value=");
    Serial.println(value);

    delay(1000);
}