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I’ve used “keypads” for Arduino in the past, but only numerical and with maybe 9 or 16 buttons, nothing more. In this tutorial I’ll show you how I’ve made this PCB, how it works to detect all of the 40 buttons and how it will be the serial output. Once we have the keyboard we will be able to send to any microcontroller any character in lowcase, upercase, numbers and special characters such as question mark, exclamation, etc. I hope you will like this project and maybe it will be usefull for your projects where you need a full alphabet keybaord.”

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