What is the voltage on a AA battery? It would be around 1:30PM if you were using this voltmeter! A PICAXE 18M2 microcontroller is used to read an analog value, calculate what time it represents and then uses a stepper motor to spin the adjustment knob to have the clock show the voltage using the hour and minute hands.
“The max input voltage for the ADC on the PICAXE 18M2 is about 5VDC. To tame the input signal for the PICAXE a simple 3:1 voltage divider (10K, 10K, 10K) was implemented. This limited the input voltage into the PICAXE to 4VDC. A trim pot was also used to adjust for the input impedance of the PICAXE and to help calibrate the measurement results.”
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