[riot-notifications] [RIOT-OS/RIOT] Add hx711 ADC driver and saul (#14039)

Philipp-Alexander Blum notifications at github.com
Thu May 7 12:34:51 CEST 2020

### Contribution description
HX711 ADC driver for weigh scales. Including SAUL implementation.

### Testing procedure
# `tests/driver_hx711`
1. Connect a [HX711 board](https://www.aliexpress.com/item/32860114708.html?spm=a2g0o.productlist.0.0.4be040a8DVInYv&algo_pvid=27c0c163-55f8-456b-8499-f39d9c0b1a3a&algo_expid=27c0c163-55f8-456b-8499-f39d9c0b1a3a-1&btsid=0ab6f83115888462128168492e1b17&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_) to a load cell on channel A. 
2. Connect DT (DOUT) and SCK to a GPIO pin of your board.
3. Go into `tests/drvier_hx711` and change the values of `HX711_PARAM_SCK`, `HX711_PARAM_DOUT`. If you use another board, change it as well.
4. Execute the test 

1. Connect the HX711 board to a weigh scale on channel A. Connect the hx711 breakout board to your microcontroller board.
2. Go into `examples/saul` and add the following to the Makefile. Change the values accordingly. 
USEMODULE += hx711
3. Flash the saul example and also use the target `term`.
4. Use `saul write [ID] 200` to tare the scale. 
5. Place a weight on your scale and execute `saul read [TIMES]` where `[TIMES]` is the number of reads. It should show the correct weight. If not, you have to adapt the divider. It is the value of `HX711_PARAM_DIVIDER`. If the weight result is too high, set a higher divider. If it is too low, you have to lower the divider. Until you have the correct value. You should use standardized weights in order to get precise results.

### Issues/PRs references
Previous PR: #11416

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-- Commit Summary --

  * Add hx711 ADC driver and saul

-- File Changes --

    M drivers/Makefile.dep (4)
    M drivers/Makefile.include (4)
    A drivers/hx711/Makefile (1)
    A drivers/hx711/hx711.c (136)
    A drivers/hx711/hx711_saul.c (49)
    A drivers/hx711/include/hx711_params.h (97)
    A drivers/include/hx711.h (122)
    M drivers/include/saul.h (3)
    A drivers/saul/init_devs/auto_init_hx711.c (67)
    M drivers/saul/init_devs/init.c (4)
    M drivers/saul/saul_str.c (1)
    A tests/driver_hx711/Makefile (9)
    A tests/driver_hx711/main.c (51)

-- Patch Links --


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