A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad wired as an X-Y switch matrix, normally-open switches connect a row to a column when ...
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 ...
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