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I am using raspberry pi 3 B+ board. I have to acquire analog voltage signal having both positive and negative parts, i.e. a bipolar signal How can i acquire this signal with the R-pi?

I have tried with High precision AD/DA ADS 1256 board and ArPy extension boards. However none of them is capable of acquiring bipolar input analog signal.

Anwesha Khasnobish
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  • I think ADS1256 can convert bipolar signals: Waveshare ADC Board negative value issue https://raspberrypi.stackexchange.com/questions/95843/waveshare-adc-board-negative-value-issue – tlfong01 Sep 06 '19 at 13:15
  • And yes, ArPy's TCL2543 can only convert unipolar analogue signal, V+ to V- full scale, Vcc to Gnd max range only. – tlfong01 Sep 06 '19 at 14:18
  • Nothing to do with the Raspberry Pi. – joan Sep 06 '19 at 14:36
  • @Anwesha Khasnobish, BTW, your WaveShare board looks like his more intelligent elder sister Jetson: (1) Get Started with NVIDIA Jetson Nano Developer Kit https://www.youtube.com/watch?v=Uvu6NNOvhg4

    (2) Waveshare Rpi AD/DA Board https://www.waveshare.com/High-Precision-AD-DA-Board.htm

     – tlfong01 Sep 07 '19 at 01:38
  • I am using waveshare.com/High-Precision-AD-DA-Board board itself. ADs1256 is not able to read signals less than 0.1V. Thus most part of the negative signal is lost. – Anwesha Khasnobish Sep 09 '19 at 11:11
  • Is there any ADC expansion available for raspberry pi which can acquire bipolar analog signals – Anwesha Khasnobish Sep 09 '19 at 11:11
  • This question is not Pi specific, and no ADC can convert voltages exceeding its supply voltage, although there are established offsetting techniques and some which generate a negative reference. – Milliways Sep 09 '19 at 11:38

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