Recording a raw analog signal

  • #1
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Greetings. I have a system that is powered by 5V . You will see below in the image. The system displays the difference between the Hi and Lo signal digitally, on the display which the board is plugged into. However. I want to store the data maybe in a SD card? Using Arduino? How do I harness the Hi Lo signal?

I am looking for circuit board recommendations i think.



upload_2018-10-17_9-53-34.png

upload_2018-10-17_9-53-49.png
 

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  • #2
phyzguy
Science Advisor
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You probably want an Analog-Digital Converter(ADC) that will convert the analog signal to digital at some fixed time interval. Then you can store the digital data as you would any other digital data.
 
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  • #3
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What is the voltage range of the two input signals? And what is the input source?

If the input voltage is less or equal to 5V you could use the built-in ADC in an Arduino or similar. How much circuitry you need in front of the ADC pins on the Arduino depends on the source of yhe hi/lo sigal.
 
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  • #4
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What you want (I think) is a data logger. LabJack makes some nice ones that are in the ~$300 - $500 range. I use the U6 Pro because it has a nice instrumentation amplifier and variable ADC resolution. Works +/-10V down to micro volts. Small USB powered unit. Plenty of digital IO timers etc.
 
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  • #5
66
7
What is the voltage range of the two input signals? And what is the input source?

If the input voltage is less or equal to 5V you could use the built-in ADC in an Arduino or similar. How much circuitry you need in front of the ADC pins on the Arduino depends on the source of yhe hi/lo sigal.
Thanks! The voltage range of the two input signals is 0-2V. The input source is 5V I think, what exactly do you mean by this? Sorry :D
 

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