555 Timer as an A/D converter

  
I had a Basic Stamp project that needed to measure a nominal 12 volt battery, and I wanted a simple solution. This is the simplest I could come up with. The 555 timer will put out positive pulses. The pulse width is inversely proportional to the difference in voltage between the voltage at `ANALOG IN` and the voltage of the 4.7uF capacitor(let`s say 2.5 volts). To calibrate this circuit, hook it up to a Basic Stamp measuring positive pulses, and give the circuit a known voltage.
555 Timer as an A/D converter - schematic




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