March 3, 2021 - Implemented the recommendation from @moononournation that changes the variant.cpp file to be compatible with the SPI1 pin definition in the SPI.cpp file. This simplifies the sketches ...

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.

We all know of the wired doorbell systems which require wires and suitable outlets for it to work satisfactorily. As the wired doorbell system needs complicated wiring, it requires an experienced ...