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Old Mar 24, 2009, 05:54 PM
zitron is offline
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United States, OH, Columbus
Joined Apr 2007
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Originally Posted by MGeo
Wow, thanks Zitron, you are my hero. Just a couple of questions if I may:

- Is the board V_in really +3V? I would have thought it was +5V (it must get regulated down somewhere on the processor board?)
- Is Ref Voltage (V_ref) output generated on board, or is it an input generated external to the board?
- What does the 103 trimmer you added do (does it divide down V_in to set V_ref?)

Thanks again.
You can power it with 5V from the servo lead, there is a regulator thingie on the sensor board. I think both the processor and the analogue parts run on 3V (or maybe 3.3V).

Yeah you are right. The Vref is apparently generated on the processor board, and is fed into the sensor board, I'm using the pot to send ~1.5V to Vref.

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