ใช้โวลุ่มเปิดปิด

#define LED_PIN A0 int value = 0; void setup() { pinMode(LED_PIN,INPUT); pinMode(D3,OUTPUT); Serial.begin(115200); } void loop() { value = analogRead(LED_PIN); delay(30); if(value>520) { digitalWrite(D3,1); delay(100); } if(value<=520) { digitalWrite(D3,0); delay(100); } int sensorvalue = value; Serial.println(sensorvalue); }