Web-site: https://gra-afch.com Direct link to category: https://gra-afch.com/product-category/rf-units/ GA_Flasher can be used to upload compiled firmware from ...

1. Arduino (any Arduino will do). 2. Keypad (it can be 4x4 or 4x3. I have used a 4x4 keypad). 3. Processing Software. 4. Keypad library Here are the links if you don ...