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How can I use an Arduino to record the voltage of an RC circuit?? Answered

Complete noob here.  I would like to lay a simple RC circuit out on a breadboard, and use the Arduino's analog input to look at how the voltage changes across the capacitor as the capacitor charges.  I've studied the theory -- I know the graphs and the how to calculate theoretical results, but I want to see real data so I can work with my own numbers.  (I have already used the analog input to measure voltage from sensors so I feel as if I have a decent understanding of what is required for that)  Of course I could go buy a voltmeter, but where's the fun of that?  Thank you in advance for any help.

2 Replies

steveastrouk (author)2010-08-05

You're short of memory to hold much data, so adding an external memory would be a good thing to do, then you sample the analog in, save the data to memory and send it out through the serial port

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txrx (author)2010-08-05

You can use the pulseIn() function to determine when a input pin on the arduino goes high.

See http://arduino.cc/en/Reference/PulseIn for more info

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