A technique for drastically reducing the pins required by a matrix keypad is described.
Project tutorial by Giovanni Carrera
A voltage to frequency converter can realize an opto-isolated analog input for Arduino or other microcontroller systems.
A simple and inexpensive solution is to use a 'mobile power bank'
by Giovanni Carrera
This interesting project will cover all things required for the ultimate goal of building a mobile remote surveillance camera.
Project tutorial by danionescu
The robot navigates indoor, in a pre-defined path, with high accuracy, and allows its real-time tracking on a phone. No GPS, No WiFi, No Map
Project tutorial by Team oblu
A tiny telegraph that can write any text messages that look like a telegrammes. This project made of oak plywood.
Project showcase by Yegor_A
You will find more details and also other examples of keypads in my blog: ardupiclab.blogspot.com
In the text I clearly explain that the goal is to extend the output range to 0 .. 3.3 V. The DAC converter of Arduino DUE generates as many as 4096 steps (12 bits) in this output range.
See also my answers to the previous questions to improve the response to values close to zero.
Hi, C2 is a by.pass capacitor to reduce noise.
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