Here I'll try to explain and show how I made this custom alarm panel for Home Assistant with a NodeMCU ESP8266. We'll start with the Keypad, in this case, I will be using a 4x4 one, you can use a 4x3 ...
This is one way to complete a homework assignment that implements much of the elemental functions to interface an Hitachi HD44780 LCD module for ASCII character display, a 3x4 telephone style keypad ...
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