調光電路

int led=3;
int sensor_val;
int delaytime=1;
void setup()
{
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  // put your main code here, to run repeatedly:
  sensor_val = analogRead(0);//0~1023
  sensor_val = map(sensor_val, 0, 1023, 0, 255);
  Serial.print("sensor_val=");
  Serial.println(sensor_val);
  analogWrite(led, sensor_val);//0~255
  delay(delaytime);
}