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Topic: Analog-to-digital conversion on Arduino Uno R3 and Arduino Mega 2560? (Read 834 times) previous topic - next topic

ilyakh

I've heard rumors that Mega has a higher precision, though I do not understand how this can be true if the scale of analogRead is still from 0 to 1024.

How can I argue for use of digital data-over-I2C (13-16 bit data) versus analog accelerometers from the ADC standpoint?

68tjs

No it's false.
As for every AVR you can enhance the AtMega328p ADC resolution. See Atmel Application Note : AVR121.

Uno board is for initiation only, she does it well, it was not expected for professionnal use.
I don't know the Mega layout but Uno layout is very poor concerning analogical signals.
No analogical ground near A0-A5 pins, the layout of Aref line is an horror : I have to sold 100nF capacitor directly on the micro socket to have stable measurment, and so on ............

Magician

Quote
How can I argue for use of digital data-over-I2C (13-16 bit data) versus analog accelerometers from the ADC standpoint?
I'd vote on digital-over-I2C, just note arduino has slow I2C < 400kHz

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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