Capacitive Sensing

Albert Hodo. Tangible UI, Fall 2022

Prompt:Make a capacitive sensor using a different material, not aluminum foil. Hint: try things that are conductive, like metal or things containing water like fruits and vegetables. Take pictures!

Components Used

1. Bread Board
2. Esp 32
3. Jump Wires
4. 1 10K Resister
5. 1 LED

Process

I took input from the capacitive touch input from the lead from the pencil marking and used the input to turn an LED on and off.

Code

bool lightOn=false;
void setup()
{
  Serial.begin(115200);
  delay(1000); // give me time to bring up serial monitor
//  Serial.println("ESP32 Touch Test");
//  pinMode(34, OUTPUT);//buzzer
  pinMode(13, OUTPUT);//led indicator when singing a note
}
void loop()
{
  Serial.println(touchRead(4));
  if(touchRead(4)<45){
    lightOn=!lightOn;
    Serial.print(lightOn);
    }
    
  Serial.print("light: ");
  if (lightOn){
    digitalWrite(13,HIGH);
    }else{
      digitalWrite(13,LOW);}
//    }
delay(1000);
}

Demo

Using Pencil Lead as Capacitive Input Arduino