I wish to build a datalogger for a geophysics project.
The logger would be used to store and measure potential difference ranging between +/- 1 mV to +/- 2.5 V DC, with a resolution of <1 mV. (1 amp max).
I have built temperature loggers before, so most of the build I can understand. Capturing the Voltage (range and step value) is tripping me up right now.
My question is this:
Rather than reinvent the voltmeter, can I take off the reading from the LCD of a multimeter so I can parse the data with software to the logged string on the Auduino?