A pic might do providing the crystal oscillator is acurate enough, but a 555 timer certainly isn't. The timing capacitor will have a tollerance of 10% before we even consider the long term stability.
A pic might do providing the crystal oscillator is acurate enough, but a 555 timer certainly isn't. The timing capacitor will have a tollerance of 10% before we even consider the long term stability.
I know the 555 timer is crapy but it's quite ok for a DIY project. It wont require a programer and some know how about PIC's. Older cheap quartz clocks (70') used 1 transistor oscilator and a simple motor with some gearing.