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Looking for an HX711 ADC alternative. Sparkfun sells a pricey breakout board with the chip, but I cannot source the IC anywhere online for some reason 🤷‍♂️. Are there any ADCs out there that have a built-in instrumentation op-amp?

My current plan is to hook-up my load cell to a stand-alone instrumentation op-amp and funnel that into the ADC of my MCU. However, since my design requires 4x of this circuit, I would much rather free up some MCU cycles and off-load these duties to a dedicated IC. Any ideas?

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    \$\begingroup\$ Look for an ADC with an inbuilt PGS. Shopping is off-topic BTW. \$\endgroup\$
    – Andy aka
    Commented Jul 22, 2020 at 14:03
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    \$\begingroup\$ They're a Chinese part so look at Chinese distributors. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Jul 22, 2020 at 14:47
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    \$\begingroup\$ @Andyaka thanks for the suggestion 👍. I know its off-topic but HX711 + strain gauge seems like the suggested solution via google, so others might find this thread useful if they need an alternative (as it can't be easily sourced) \$\endgroup\$
    – scottc11
    Commented Jul 22, 2020 at 14:52
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    \$\begingroup\$ This is not that sort of site and "others" are to be cautioned that this site is not for shopping. \$\endgroup\$
    – Andy aka
    Commented Jul 22, 2020 at 15:01

2 Answers 2

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You can do a parametric search at a distributor such as Digikey for various 24-bit ADCs that work down to DC. Expect to pay 10-100x more than the Avia part.

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Question

How to use a cheap HX711 module?

Answer

I have been using cheap cheap US$1 HX711 modules like this (Ref 1):

References

(1) AliExpress HX711 WeighingPressure Sensor Dual Channel 24 Bit Precision ADC Module - US$1

(2) HX711 Forum Discussion - rpi.org.forum, 2018nov17

Appendices

Appendix A - HX711 Module Wiring and Configuration

hx711 1

hx711 2

End of answer

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