Getting 0.000 grams when using nrf52840dk with NRF Connect SDK (2.6.1)

[amudhan-rkr]

I am new to Embeded programming and starting with NRF connect SDK.

I followed the steps and configured this as a module in my project and able to compile. But the reading always comes a 0.00 grams.

I used 907 gram as a calibration weight.

This is the weight sensor setup.

As this board don't have rate GPIO so here is my overlay file setting

/{ hx711 { compatible = "avia,hx711"; status = "okay"; //label = "HX711"; dout-gpios = <&gpio0 26 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>; sck-gpios = <&gpio0 27 GPIO_ACTIVE_HIGH>; //rate-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>; }; };

[nobodyguy]

Hello, NRF Connect SDK 2.6.1 (Zephyr 3.5.99) is not tested and supported. Can you post logs with CONFIG_SENSOR_LOG_LEVEL=4 configured?

[amudhan-rkr]

Here is the log:

[00:00:00.366,302] <dbg> HX711: hx711_init: Initialising HX711

[00:00:00.366,333] <dbg> HX711: hx711_init: SCK GPIO port : gpio@50000000

[00:00:00.366,363] <dbg> HX711: hx711_init: SCK Pin : 27

[00:00:00.366,394] <dbg> HX711: hx711_init: DOUT GPIO port : gpio@50000000

[00:00:00.366,424] <dbg> HX711: hx711_init: DOUT Pin : 26

[00:00:00.366,424] <dbg> HX711: hx711_init: Gain : 1

[00:00:00.366,455] <dbg> HX711: hx711_init: Offset : 0

[00:00:00.366,455] <dbg> HX711: hx711_init: Slope : 1.0

[00:00:00.366,485] <dbg> HX711: hx711_init: SCK pin controller is 0xa558, name is gpio@50000000

[00:00:00.366,546] <dbg> HX711: hx711_init: DOUT pin controller is 0xa558, name is gpio@50000000

[00:00:00.366,577] <dbg> HX711: hx711_init: Set DOUT pin : 26

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***
[00:02:05.180,999] <inf> main: Device is 0xa580, name is hx711
[00:02:05.181,030] <inf> main: Calculating offset...
[00:02:05.522,979] <dbg> HX711: avia_hx711_tare: Average before division : 41943040
[00:02:05.523,010] <dbg> HX711: avia_hx711_tare: Average after division : 8388608
[00:02:05.523,040] <inf> main: Waiting for known weight of 100 grams...
[00:02:05.523,040] <inf> main:  10..
[00:02:06.523,162] <inf> main:  9..
[00:02:07.523,254] <inf> main:  8..
[00:02:08.523,437] <inf> main:  7..
[00:02:09.523,620] <inf> main:  6..
[00:02:10.523,803] <inf> main:  5..
[00:02:11.523,986] <inf> main:  4..
[00:02:12.524,169] <inf> main:  3..
[00:02:13.524,353] <inf> main:  2..
[00:02:14.524,536] <inf> main:  1..
[00:02:15.524,719] <inf> main:  0..
[00:02:16.524,902] <inf> main: Calculating slope...
[00:02:16.811,889] <dbg> HX711: avia_hx711_calibrate: Average before division : 41943040
[00:02:16.811,920] <dbg> HX711: avia_hx711_calibrate: Average after division : 8388608
[00:02:16.811,950] <dbg> HX711: avia_hx711_calibrate: Slope set to : 1.000000
[00:02:28.658,691] <inf> main: Weight: 0.000000 grams
[00:02:40.212,493] <inf> main: Weight: 0.000000 grams
[00:02:41.212,890] <inf> main: Weight: 0.000000 grams
[00:02:42.213,256] <inf> main: Weight: 0.000000 grams
[00:02:43.213,623] <inf> main: Weight: 0.000000 grams
[00:02:44.213,989] <inf> main: Weight: 0.000000 grams
[00:02:45.214,355] <inf> main: Weight: 0.000000 grams
[00:02:46.214,721] <inf> main: Weight: 0.000000 grams
[00:02:47.215,087] <inf> main: Weight: 0.000000 grams
[00:02:48.215,454] <inf> main: Weight: 0.000000 grams
[00:02:49.215,820] <inf> main: Weight: 0.000000 grams
[00:02:50.216,186] <inf> main: Weight: 0.000000 grams
[00:02:51.216,552] <inf> main: Weight: 0.000000 grams
[00:02:52.216,918] <inf> main: Weight: 0.000000 grams
[00:02:53.217,285] <inf> main: Weight: -65536.000000 grams
[00:02:54.217,651] <inf> main: Weight: 0.000000 grams
[00:02:55.218,017] <inf> main: Weight: 0.000000 grams
[00:02:56.218,383] <inf> main: Weight: 0.000000 grams
[00:02:57.218,750] <inf> main: Weight: 0.000000 grams
[00:02:58.219,116] <inf> main: Weight: 0.000000 grams
[00:02:59.219,482] <inf> main: Weight: 0.000000 grams
[00:03:00.219,848] <inf> main: Weight: 0.000000 grams
[00:03:01.220,214] <inf> main: Weight: 0.000000 grams
[00:03:02.220,581] <inf> main: Weight: 0.000000 grams
[00:03:03.220,947] <inf> main: Weight: 0.000000 grams
[00:03:04.221,313] <inf> main: Weight: 0.000000 grams
[00:03:05.221,679] <inf> main: Weight: 0.000000 grams
[00:03:06.222,045] <inf> main: Weight: 0.000000 grams
[00:03:07.222,412] <inf> main: Weight: 0.000000 grams
[00:03:08.222,778] <inf> main: Weight: 0.000000 grams
[00:03:09.223,144] <inf> main: Weight: 0.000000 grams
[00:03:10.223,510] <inf> main: Weight: 0.000000 grams
[00:03:11.223,876] <inf> main: Weight: 0.000000 grams
[00:03:12.224,243] <inf> main: Weight: 0.000000 grams
[00:03:13.224,609] <inf> main: Weight: 0.000000 grams
[00:03:14.224,975] <inf> main: Weight: 0.000000 grams
[00:03:15.225,341] <inf> main: Weight: 0.000000 grams
[00:03:16.225,708] <inf> main: Weight: 0.000000 grams
[00:03:17.226,074] <inf> main: Weight: 0.000000 grams
[00:03:18.226,440] <inf> main: Weight: 0.000000 grams
[00:03:19.226,806] <inf> main: Weight: 0.000000 grams
[00:03:20.227,172] <inf> main: Weight: 0.000000 grams
[00:03:21.227,539] <inf> main: Weight: 0.000000 grams
[00:03:22.227,905] <inf> main: Weight: 0.000000 grams
[00:03:23.228,271] <inf> main: Weight: 0.000000 grams
[00:03:24.228,637] <inf> main: Weight: 0.000000 grams
[00:03:25.229,003] <inf> main: Weight: 0.000000 grams
[00:03:26.229,370] <inf> main: Weight: 0.000000 grams
[00:03:27.229,736] <inf> main: Weight: 0.000000 grams
[00:03:28.230,102] <inf> main: Weight: 0.000000 grams
[00:03:29.230,468] <inf> main: Weight: 0.000000 grams

[nobodyguy]

Thank you. Can you describe your setup? (HW connection, other peripherals, basic firmware flow...) You can also try this config option if there are some higher priority interrupts (radio stack, etc.) messing up the HX711 communication: CONFIG_HX711_DISABLE_INTERRUPTS_WHILE_POLLING=y

[nobodyguy]

Feel free to reopen it with more info.