Хүний гар хүрэхийг мэдэрж гэрэл асах

#include <CapacitiveSensor.h>CapacitiveSensor   cs_4_2 = CapacitiveSensor(4,2);        
// 10M resistor between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desiredint threshold = 20;
void setup()                    
{
  cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
}void loop()                    
{
  long capVal =  cs_4_2.capacitiveSensor(30);
  Serial.println(capVal);if ( capVal > threshold ) {
    digitalWrite(LED_BUILTIN, HIGH);
  } else {
    digitalWrite(LED_BUILTIN, LOW);
  }

}