int pinled = 4;
int pininput = 0;
int periksa = 0;

void setup() {
  pinMode(pinled, OUTPUT);
  pinMode(pininput, INPUT);
}

void loop() {
  periksa = digitalRead(pininput);
  if(periksa == HIGH){
    digitalWrite(pinled, HIGH);
    delay(100);
  }else{
    digitalWrite(pinled, LOW);
    delay(100);
  }
}
esp:0
esp:2
esp:4
esp:5
esp:12
esp:13
esp:14
esp:15
esp:16
esp:17
esp:18
esp:19
esp:21
esp:22
esp:23
esp:25
esp:26
esp:27
esp:32
esp:33
esp:34
esp:35
esp:3V3
esp:EN
esp:VP
esp:VN
esp:GND.1
esp:D2
esp:D3
esp:CMD
esp:5V
esp:GND.2
esp:TX
esp:RX
esp:GND.3
esp:D1
esp:D0
esp:CLK
led1:A
led1:C
r1:1
r1:2
r2:1
r2:2
btn1:1.l
btn1:2.l
btn1:1.r
btn1:2.r