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Topic: arduino mega 2560 samples per second (Read 766 times) previous topic - next topic

husnalraikumar

Hi,

does any one knows how much samples arduino mega 2560 takes per second ?
whats the rate?

thank you

AWOL

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

husnalraikumar

both.
and can you help me how the sampling on digital output works ?

AWOL

Out-of-the box analogue, around 9000 samples per second.
Digital? Depends on how you sample (parallel or bitwise), and what you do with it.

What are you trying to do?
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

husnalraikumar

Basically I am planning to feed it 2-3 analog signals, do the sorting and get 2-3 digital out put and storing that data on a SD card

AWOL

Quote
Basically I am planning to feed it 2-3 analog signals

There's only one ADC, so sharing it three ways reduces your per-channel sample rate to around 3000 samples per second, so a bandwidth of 1500Hz.
That's pretty poor quality, around half the bandwidth of a standard speech channel.

You can increase the rate, at the expense of resolution.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

husnalraikumar

#6
Feb 07, 2013, 03:47 pm Last Edit: Feb 07, 2013, 03:49 pm by husnalraikumar Reason: 1
can you please explain what do you mean by ' expense of resolution '?
and what about the digital output rate ?

AWOL

By default, analogRead returns 10 bit samples.
If you can accept eight bit samples, your can increase the sample rate.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

husnalraikumar

and what about the digital output ?

AWOL

Depends on how much processing you're doing.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

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