Recording raw signal

Other Hardware Storage
1

Hello,
I will order a device for recording raw signal from 2 to 6 channels. Sampling frequency from about 3kHz to 10kHz per channel. Record data is best on SD or another device.
Best on Arduino, but maybe another uC.
Details on priv esox11 (at) interia.pl
Regards
Maciej from Poland

2

varo1978:
Hello,
I will order a device for recording raw signal from 2 to 6 channels. Sampling frequency from about 3kHz to 10kHz per channel. Record data is best on SD or another device.
Best on Arduino, but maybe another uC.
Details on priv esox11 (at) interia.pl
Regards
Maciej from Poland

Sounds like you want multiple cassette recorders.

You need to expand your requirements:
How deep does each channel need to be? (length of recording in seconds, minutes, hours, days, years?)
What resolution do you need? (on/off 1bit, 24bit?)
What is the signals range?( 0..1v)

No one can guess what you want.

Chuck.

3

Hi Chuck,

  • the resolution can be 10 bits or 12 bits - depends of arduino, external ADC is not required.
  • hardware I can do myself, I will use voltage divider so that it can be measured from eg +/-1V to +/- 10V. I will change the divider with a jumper,
  • recording length about 2-3 minutes,
  • number od channels - 2 but 1 channel is tachometer and second is to vibration sensor,
  • because vibration sensor measure to 8kHz so frquency sampling should be 8*2.56=20.48kHz, tachometer is DC signal,

The system would record every 2-3 minutes every day, and when the card is full, the diode should lights on. Next I write data to PC and the rest I do in Matlab.
One more thing, each record should be in a separate file with the recording time information.

Is it possible?
Regards
Maciej

4

varo1978:
Hi Chuck,

  • the resolution can be 10 bits or 12 bits - depends of arduino, external ADC is not required.
  • hardware I can do myself, I will use voltage divider so that it can be measured from eg +/-1V to +/- 10V. I will change the divider with a jumper,
  • recording length about 2-3 minutes,
  • number od channels - 2 but 1 channel is tachometer and second is to vibration sensor,
  • because vibration sensor measure to 8kHz so frquency sampling should be 8*2.56=20.48kHz, tachometer is DC signal,

The system would record every 2-3 minutes every day, and when the card is full, the diode should lights on. Next I write data to PC and the rest I do in Matlab.
One more thing, each record should be in a separate file with the recording time information.

Is it possible?
Regards
Maciej

The AtMel chips(Arduinos cpu) has multiple analog inputs, 6 on the Uno, 16 on the Mega2560, but only ONE ADC per chip. Max hardware sample freq is about 100k, but, you have limited RAM 2k or 8k, and you would have to both sample and store the data in real time.

Moving 40kbytes /second for 180 seconds get tough.

Do a search on highspeed data logger: AdaFruit data logger

Chuck.

5

Hi Chuck,
I found something like this:

I will try to do the same and next change code to my application :slight_smile:
Best Regards
Maciej