Published July 17, 2022 © CC BY

Multiple switches to single analogRead

This tutorial we will learn how to use multiple switches and output a single signal to be analogRead by an Arduino.

BeginnerFull instructions provided1 hour158

Things used in this project

Hardware components

Arduino Nano R3

SparkFun Pushbutton switch 12mm

Resistor 1k ohm

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Breadboard, 830 Tie Points

Story

We will learn how to use multiple switches and output to single analogRead in an Arduino.

We will be using same resistance resistors for this project.

This attached Arduino code is only for 12 switches.

To do other number of switches, we will test the voltages across the switches using the analogRead function in an Arduino.

Schematic for 12 switches

An Arduino analogRead a voltage from 0 Volt to 5 Volts with a scale from 0 to 1023.

When no switch is pressed, it reads 1023.

When switch 1 is pressed, it reads 0.

When switch 2 is pressed, it reads 512.

When switch 3 is pressed, it reads 682.

When switch 4 is pressed, it reads 767.

When switch 5 is pressed, it reads 819. And so forth.

We will give some buffer for the voltage in the scale. For example, for 512, we will give a range from 510 to 514.

Hope you enjoy this tutorial.

Code

Multiple switches to single analogRead

int pin = A0;

void setup()
{
  pinMode (pin, INPUT);
  Serial.begin (9600);
}

void loop()
{
  int volt = analogRead (pin);
  Serial.println(volt);
  if (volt >= 0 && volt <= 2)
  {
    Serial.println("1");
  }
  if (volt >= 510 && volt <= 514)
  {
    Serial.println("2");
  }
  if (volt >= 680 && volt <= 684)
  {
    Serial.println("3");
  }
  if (volt >= 765 && volt <= 769)
  {
    Serial.println("4");
  }
  if (volt >= 817 && volt <= 821)
  {
    Serial.println("5");
  }
  if (volt >= 851 && volt <= 855)
  {
    Serial.println("6");
  }
  if (volt >= 875 && volt <= 879)
  {
    Serial.println("7");
  }
  if (volt >= 893 && volt <= 897)
  {
    Serial.println("8");
  }
  if (volt >= 908 && volt <= 912)
  {
    Serial.println("9");
  }
  if (volt >= 919 && volt <= 923)
  {
    Serial.println("10");
  }
  if (volt >= 929 && volt <= 933)
  {
    Serial.println("11");
  }
  if (volt >= 936 && volt <= 940)
  {
    Serial.println("12");
  }
  delay (500);
}