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Topic: Question about the analog input of "Arduino mega 2560 " (Read 1 time) previous topic - next topic

class

Hi guys

i want to use "Arduino mega 2560 " as data acquisition,
but the analog signal is bipolar(ECG signal)

so can i direct measure this signal or i need signal conditioning circuit?

retrolefty


Hi guys

i want to use "Arduino mega 2560 " as data acquisition,
but the analog signal is bipolar(ECG signal)

so can i direct measure this signal or i need signal conditioning circuit?


You will need some form of external signal conditioning as the arduino analog inputs cannot safety handle negative voltages (below -0.5vdc) or positive voltages about Vcc + 0.5vdc. This same voltage limit applies to the digital input pins also.

Lefty

class

#2
Feb 05, 2013, 05:53 pm Last Edit: Feb 05, 2013, 05:56 pm by class Reason: 1
thank you(retrolefty)

are there datasheet for analog input?

retrolefty


thank you(retrolefty)

are there datasheet for analog input?


Well there is a Atmel datasheet avalible that covers the complete mega2560 chip that has sections covering the build in ADC.
http://www.atmel.com/images/doc2549.pdf
Lefty



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