Tiny basic PWM The ATtiny85 microcontroller allows us to generate an analog output using PWM. The ATtiny85 microcontroller has two timers that can be used to generate PWM signals. The first is Timer 0 ...

To that end, [Josh] wanted to try using a rather famous IC with his Arduino to build a viable timepiece. [Josh]’s idea was straightforward—employ a 555 timer IC to generate a square wave at 1 Hz.