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Topic: Using small voltage for Aref (Read 525 times) previous topic - next topic

Deeksie

Hi guys,

If I use a voltage divider to get maybe 0.05v on the aref pin, in theory I should be able to measure voltages down to around +/-0.0001v kind of range (ball park figure). Is this genuinely possible? It sounds to good to be true, and I can't find any literature in the datasheet to either confirm or deny it.

Thanks in advance,
Deeksie

Nick Gammon

Page 323.

ADC Characteristics

Reference Voltage: minimum: 1V
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

smeezekitty

I dont know just how good the ADC is but with 1v reference, you should be able to achieve .001v precision.
Avoid throwing electronics out as you or someone else might need them for parts or use.
Solid state rectifiers are the only REAL rectifiers.
Resistors for LEDS!

Deeksie

Just noticed I hadn't replied much earlier, how rude of me! Thanks for your help, you cleared up the question for me. :-)

wanderson

The only way to measure voltages (with an a2d) down to the tenth of a millivolt range with any accuracy is to use an amplifier and measure the amplified voltage
New true random number library available at: http://code.google.com/p/avr-hardware-random-number-generation/

Current version 1.0.1

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