Can anyone tell me if I can capture the volt and amp readings from a multimeter . I have the BOE ,BS2,and Eb500 Bluetooth sending data to StampPlot. I would like to be able read volts and amps from my robot to StampPlot.
Theoretically you could do it, but practically it may not be worth it compared to reading the values directly with an external analog to digital converter. If you have a digital multimeter, it's probably a single chip device that directly drives an LCD display. You could theoretically tap into the display connections, but they're probably hard to reach and connect to. If it's an analog multimeter, you have the issue of changing the selection dial. The meter movement is very sensitive and you'd have to very carefully amplify and digitize the meter movement current.
Download a copy of the Basic Analog and Digital tutorial (www.parallax.com/detail.asp?product_id=28155). Chapter 3 talks about analog to digital conversion. To measure current, you'll have to insert a small value resistor in the lead you're interested in, then use an op amp to amplify the voltage across the resistor and present it to an A/D converter.
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Download a copy of the Basic Analog and Digital tutorial (www.parallax.com/detail.asp?product_id=28155). Chapter 3 talks about analog to digital conversion. To measure current, you'll have to insert a small value resistor in the lead you're interested in, then use an op amp to amplify the voltage across the resistor and present it to an A/D converter.