Timer Issue With HX711 - Stopped By Vector Catch Error

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

MikeLemon — Wed, 01 Jan 2020 21:10:28 GMT

Hii Vidar,

I'm trying to run your example(and this issue is consistent across most example) using the nordic SDK15

and it simply prints me this error saying it can't find the file after literally opening the .emProject file in text editor and changing the directories "../../../../../../" to my SDK directory: "C:/Nrf_Env/nRF5_SDK_15" and there is the first error:

C:/Nrf_Env/nRF5_SDK_15/components/libraries/log/src/nrf_log_backend_serial.c: No such file or directory

What am I doing wrong? how do you make such "project" compatible generally?

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

JWCode — Thu, 15 Aug 2019 20:53:23 GMT

Did you simply extract the zip file and run it? I am unable to get anything other than 0's in my TX characteristic values. Help would be much appreciated

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

JWCode — Thu, 15 Aug 2019 19:33:48 GMT

I believe that is simply the weight sensor output. You need to calibrate the scale to get useful values

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Pepam — Mon, 12 Aug 2019 08:38:23 GMT

Hi Vidar Berg,

I tried this ble_app_uart_w_hx711 example you provided, but when I start debuging I can see just this number -8388608 in debug terminal. Please see attached screenshot. In hx711 chip is not the problem, I tried this hx711 on Arduino and it worked.

thank you for your answer

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

FiL0 — Fri, 29 Mar 2019 20:55:48 GMT

Hi Vidar, That did the trick! Thanks for the quick and helpful answer!

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Fri, 29 Mar 2019 07:03:58 GMT

Hi,

I'm glad to hear that the sample code worked. The hx711 driver would need to be modified a bit to work together with the PWM library because they both use TIMER->PPI->GPIOTE for generating the output signal. I.e., make sure they don't share the same timer instance or gpiote channels. However, I would instead recommend you to use the PWM driver which uses the dedicated PWM HW. This should work fine with the hx driver.

The library was initially made for the 51 series that didn't have a PWM peripheral.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

FiL0 — Thu, 28 Mar 2019 19:05:42 GMT

Hi Vidar,

Thanks for the code example. I tried it on my NRF52 dev kit and it worked no issues.

However, Once I add the PWM library example, then it falls over. It just doesn't want to run at all. I've debugged it, and the gpiote_evt_handler is not called.

Can you maybe help me through this issue?

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Germàn — Tue, 12 Mar 2019 13:58:49 GMT

Thank you very much for answering Vidar Berg, I did what you asked with ble_app_uart_w_hx711 in my NRF52DK and it worked perfectly with nRF UART V2.0 for Android. The HX711 was sending but maybe I have a problem in the baud rate because they only see symbols question mark in black. 
In Windows7, via PuTTy I can not open port COM4, I guess that the code example is only for Ble. Now, if you could help me to use the code without Ble? Many thanks for your attention Vidar.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Tue, 12 Mar 2019 12:19:06 GMT

You should start with the ble_app_uart_w_hx711 project I included the accepted answer above.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Germàn — Tue, 12 Mar 2019 12:03:34 GMT

Good morning Mbards, 
I need to read data hx711 in nrf52dk but I have no experience in programming. 
I have read your thread and tried to schedule my nrf52dk in the example twi_master_using_nrf_twi_mngr using SDK v15.2.0, hx711.h and hx711.c 
I would appreciate if you could show me all the main.c for the example in nrf52dk. 
Many thanks for your help.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Thu, 21 Feb 2019 13:57:13 GMT

hello. I've been powering the hx711 with the VDD pin, which I saw supplies about 3V on my board. I have then been using the hx711 to supply the excitation voltage to the load cell. I realised that this reduces the sensitivity greatly. My question is if I was to externally excite the load cell, with, say 5V, would it affect my readings with the nrf52840, given that i saw the absolute maximum Vi/o rating is 3.9V?

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

MGK — Wed, 20 Feb 2019 11:32:06 GMT

I am working with a nRF52840 DK with SES. The examples work fine on the board. Can i use the SES project in the pca10056 folder of the ble_app_uart example?

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Tue, 19 Feb 2019 13:25:25 GMT

Ok. Thank you very much for all the help you've offered me.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Tue, 19 Feb 2019 13:20:08 GMT

Calibration is not included in this code unfortunately. You need to implement it in your app. E.g., implement BLE commands to set calibration points, do linear regression, and store the curve to flash.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Tue, 19 Feb 2019 13:16:58 GMT

I'd like to ask, when I went through the hx711 code written for Arduino, there was the issue of calibrating the hx711. Maybe it has already been done in the program. If so, I kindly ask for your direction to that section of the program.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Tue, 19 Feb 2019 12:58:20 GMT

Thanks. I switched from the 5V pin to VDD pin and now I am getting the values

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Tue, 19 Feb 2019 11:50:59 GMT

You will exceed the maximum rating for I/O pin voltage on the chip if you supply 5v, which may damage the chip. The digital logic should be equal to VDD.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Tue, 19 Feb 2019 10:34:31 GMT

I am using optimization level -o3and I am powering the hx711 through the 5V pin provided by the nrf52840

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Tue, 19 Feb 2019 09:27:28 GMT

It shouldn't be a problem to use pin 5 and 4 as long as they are not used for anything else in your code. Have you tried compiling with code optimization enabled? It may be necessary to read out the DOUT pin fast enough. Are you powering the hx711 through another GPIO?

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Tue, 19 Feb 2019 09:07:20 GMT

which pins of your nrf dev kit did you use, cause I'm using Arduino pin 5 and 4 and I only seem to be reading 0 values. any help would be greatly appreciated.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Fri, 15 Feb 2019 10:03:18 GMT

Yes, it should work with the nRF52840

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

MGK — Thu, 14 Feb 2019 20:18:08 GMT

Hi, Do you know if the example will work with the nrf52840? Would like to implement the coded phy long range feature in my project which only is supported by the nrf52840.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Wed, 13 Feb 2019 10:08:37 GMT

Sorry for the bother, but looking at the thingy SDK, I see that there is a specific way the thingy pins have been defined. So, when connecting the hx711 to the thingy, can I still use the pins defined in your code and am I supposed to change the pin configurations in the code that you've provided.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Eugene0469 — Wed, 13 Feb 2019 07:42:50 GMT

Thanks. Will try it then get back to you.

RE: Timer Issue With HX711 - Stopped By Vector Catch Error

Vidar Berg — Tue, 12 Feb 2019 16:29:51 GMT

It should work with SDK 12, I just haven't tried it. There may be some minor API differences.

You are correct in that the thingy FW is based on SDK 12. However, if you are developing new FW you should consider using the latest SDK (currently 15.2)