If you use a Pro Mini (or similar) you could use and ST7805 regulator which will take up to 35 Volts in. Add some capacitors to filter 0.1µF out the very high spike and you should be good.
If you use a Pro Mini (or similar) you could use and ST7805 regulator which will take up to 35 Volts in. Add some capacitors to filter 0.1µF out the very high spike and you should be good.