Introduction: Multiple Buttons With a Single Pin
A lot of us happen to end the PIN analog on our board, to avoid this you can create a circuit that depending on the voltage varies Arduino decide which button was pressed.
Step 1: The Circuit
First we need to:
- Arduino Uno
- A resistor 4.7 KOhm
- Three resistors 1 Kohm
- Four buttons
- Wires for links
Mounted the circuit as described in the picture or ".fzz" file.
Step 2: The Sketch
After mounting the circuit we go to the sketch:
// Created by //
// Alessio Bigini 2015 //
// http://alessiobigini.it //
Serial.begin(9600); //Valore seriale
int sensorValue = analogRead(A0); //Lettura Analogica
float voltage = sensorValue * (5.0 / 1023.0); //Conversione in Volt
Serial.println(voltage); //Stampo nel monitor seriale la tensione
Copied and uploaded the sketch on our board, opening the serial monitor, we can see the different voltage values depending on the button pressed.
Step 3: Some Pictures of the Project
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