don’t get me wrong, i have and use arduionos. but an arduino for an alarm clock isn’t much of a hack. go with bcd counters and some dip-switches. use 74266 to compare set time with current ...

Or perhaps you can combine both worlds, which is what [oldmaninSC] did with his digital clock ... with each LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino, along with ...