The following tutorials cover the Arduino’s ability to sense digital and analog inputs and to respond to these inputs. The upcoming tutorials introduces techniques that you can use for these inputs. We explore the use of a digital input by using the example of a button. Furthermore, we will look…

In this tutorial, you will learn how to control a LED by pushing a button. We have learned in earlier tutorials. how to automatically blink an LED with Arduino. That program will run as long as there is a power for the Arduino. Let’s go a bit further and try…

In the previous tutorial, we already learned how to turn a LED on with a button. The problem arises that if the button is unpressed the LED turns off. If you would like to keep the LED on after the button is pressed we need to remember the state of…

In this tutorial, we will control 3 LEDs with a single button switch. I have added 2 new LEDs to pins 9 and 8. Every time the button is pressed the switch is closed and sends a HIGH signal. If this happens, the LED will light up in a row.…

In this Arduino tutorial, you will learn how to reliable detect if a pushbutton is open or closed. Pushbuttons can generate spurious open/close transitions when they are pressed due to mechanical or physical issues. These transistion may be read by the Arduino as multiple presses. To overcome this problem we…

In this tutorial, we will read the values of a keypad without using libraries. This tutorial is for those who want to understand how the keypad works. Firstly, we will learn how the keypad works. In other words, how a keypad detects key presses. An easy example is given by…

In this tutorial, we will use the analogRead() function to read the voltage on a potentiometer.  All Arduino Boards have a 10-bit analog to the digital converter. This means that it will map input voltages between 0 and the operating voltage (5V or 3.3V) into integers between 0 and 1023.…

Recall that analogRead() returns a value between 0 and 1023. If you don’t then please read Reading analog values. We will use the input value we are going to read from a potentiometer as the output value for the analogWrite() function. In the last tutorial, we divided the value received…