Physical Controllers

Hand holding sensor

Measure the voltage - could be a chain of humans that hold hands, Arduino measure the voltage and smoothes it out with a capacitor. The LED is just to show the difference in voltage:

The Arduino connects to 5Volts, Ground and Analog 0

The Breadboard, purple wires are for holding in your hands. Capacitor to smooth out the voltage.

The code

void setup() {

 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 pinMode(LED_BUILTIN, OUTPUT);

}

void loop() {

 // read the input on analog pin 0:
 int sensorValue = analogRead(A0);
 // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
 float voltage = sensorValue * (5.0 / 1023.0);
 // print out the value you read:
 Serial.println(voltage);
 digitalWrite(LED_BUILTIN, HIGH);
 delay(voltage * 10);
 digitalWrite(LED_BUILTIN, LOW);
 delay(voltage * 10);

}