555 Timer as an A/D converter


Posted on Jan 31, 2013

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
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Christmas Star with LEDs
15 x 7 LED display with PIC16F628
High-Gain Current Sensor
Energy Saver Relay Coil circuit and explanation
Silent Radio LED sign to Arduino
repeating interval timer
using doorbell circuit control things radio control
Low-Power Voltage Reference
Transcutaneous Electrical Nerve Stimulator (TENS)
Oscillator
AMP-04 0 F 400 temperature measurement circuit
Driving circuit schematic



Top