Thanks, but after i remove the first if statement serial monitor displayed single analogvalue same the old.
const int ledPin = 13;
void setup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
pinMode(9, OUTPUT);
}
void loop() {
int sensorValue1 = analogRead(A0);
int sensorValue2 = analogRead(A1);
int sensorValue3 = analogRead(A2);
int light_sensitivity = 500;
int incomingByte;
// read the oldest byte in the serial buffer:
incomingByte = Serial.read();
switch (incomingByte) {
case 'a':
Serial.println(sensorValue1);
break;
case 'b':
Serial.println(sensorValue2);
break;
case 'c':
Serial.println(sensorValue3);
break;
case 'H':
digitalWrite(ledPin, HIGH);
break;
case 'L':
digitalWrite(ledPin, LOW);
break;
}
if (sensorValue3 < light_sensitivity)
{
digitalWrite(9, HIGH);
}
else
{
digitalWrite(9, LOW);
}
delay(300);
}