I'm using this ADC with a load cell for weight measurement, I had 4 strain gauges and mounted them on a cantilever structure that I made out of acrylic sheet, used calibration program from here: https://github.com/olkal/HX711_ADC/blob/master/examples/Calibration/Calibration.ino,

followed the steps but it gave calibration factor as 0.00 and the output was NaN or inf . I used another program from here: https://github.com/queuetue/Q2-HX711-Arduino-Library/tree/master/examples/simple_scale and the output was just hovering around 83868. So I thought that the mounting was the problem and used a load cell (green label, CZL 601) with the above and found the same results by doing the above.

Then I thought maybe the ADC is at fault , measured the power output from Arduino to the board and it was around 5 V , but when I measured between the E+ and E- , I got 0 V. Since it is the excitation voltage to the bridge, it should be around 5V too right?

Is this the right way of checking the board?

P.S. I measured the four wires of the load cell and connected the opp. ends of the bridge to the E+ , E- , A+ , A- (order doesn't matter here right? connected the pairs that showed the rated resistance to E's and A's separately)

Here's a [pic][1] of the connections

Between White and green wire the Resistance is 350 ohm Between Bk( connected in the board ) and the red it is 408 ohm Between White and red it was 263 ohm Between white and bk it is 320 ohm

Between bk(not connected in the board) and all others it is around 1 MOhm (so ignored that) [1]: https://photos.app.goo.gl/4HEmZaN1EwZ7Mjur7

  • Start by checking the communication between the Arduino and the HX711. If that isn't working then you won't see anything useful. E+ won't be 5V until told to be by the Arduino.
    – Majenko
    Oct 7, 2020 at 10:46
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    I don't have those things , its actually a small project that I'm doing for my home! Any other method, that doesn't require more electronics!! Really appreciate the help, it's just that it's not a practical option for me! Thanks Oct 7, 2020 at 13:31
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    Yes I did! I have gn it as 8 and 9 ! Oct 7, 2020 at 14:39
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    Although... looking more closely at your photo - you haven't soldered the headers to your HX711 breakout board. You need to do that or they won't be making a good contact.
    – Majenko
    Oct 7, 2020 at 14:58
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    Thank you for your I/p. Since I just bought it , I thought I'll plug and see! I'll try to test out other possible causes and let you know! Oct 7, 2020 at 15:00

1 Answer 1


Looking closely at the photo of your setup I can see that you haven't soldered the header to the breakout board. Whilst there are headers available that don't require soldering, and ways of making header connections that don't require soldering, this isn't either of those.

Without solder the connection to the board will be intermittent at best and non-existent in general.

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