Description: The membrane keypad has keys 0-9, which play notes C4, D4, E4, F4, G4, A4, B4, C5, E5, and D5. The * and # keys are used to change the duration from 2/10 of a second and 8/10 of a second.
When we are talking about the MAX7219-based dot matrix display module, it consists of 64 LEDs connected in a row-column format so that we could easily control them with the multiplexing technique.
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