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HX711_zephyr_driver

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Out of tree HX711 weight sensor driver for Zephyr RTOS

// repository documentation

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# Out of tree HX711 sensor driver module for Zephyr RTOS
*HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weigh scale applications.*

## Supported and tested Zephyr versions
* 3.3.0 (February 2023)
* 3.2.0 (September 2022)
* 2.7.0 LTS2 Release (October 2021)
## Usage
### Module installation for projects using west modules
Add this project to your `west.yml` manifest:
```yaml
- name: HX711
  path: modules/HX711
  revision: refs/tags/zephyr-v3.2.0
  url: https://github.com/nobodyguy/HX711_zephyr_driver
```

So your projects should look something like this:
```yaml
manifest:
  projects:
    - name: zephyr
      url: https://github.com/zephyrproject-rtos/zephyr
      revision: refs/tags/zephyr-v3.2.0
      import: true
    - name: HX711
      path: modules/HX711
      revision: refs/tags/zephyr-v3.2.0
      url: https://github.com/nobodyguy/HX711_zephyr_driver
```

This will import the driver and allow you to use it in your code.

Additionally make sure that you run `west update` when you've added this entry to your `west.yml`.

### Module installation for projects not using west modules directly
1) Create directory named `modules` inside project root directory.
2) Clone this repository into `modules` as `HX711` directory
3) Edit `CMakeLists.txt` in your project's root directory:
```CMake
set(ZEPHYR_EXTRA_MODULES "${CMAKE_SOURCE_DIR}/modules/HX711")
find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
```

### Driver configuration
Enable sensor driver subsystem and HX711 driver by adding these entries to your `prj.conf`:
```ini
CONFIG_SENSOR=y
CONFIG_HX711=y
```

Define HX711 in your board `.overlay` like this example:
```dts
/{
	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>;
	};
};
```

There are also optional output filters that you can enable and configure.
The first one is a median filter to discard any peak values.
```ini
CONFIG_HX711_ENABLE_MEDIAN_FILTER=y
CONFIG_HX711_MEDIAN_FILTER_WINDOW_SIZE=3
```

The second one is an exponential moving average (EMA) to smooth out the output.
```ini
CONFIG_HX711_ENABLE_EMA_FILTER=y
CONFIG_HX711_EMA_FILTER_ALPHA_FACTOR=50
```

### Driver usage
```c
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/util.h>
#include <zephyr/types.h>

#include <sensor/hx711/hx711.h>
#include <stddef.h>

LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);

const struct device *hx711_dev;

void set_rate(enum hx711_rate rate)
{
	static struct sensor_value rate_val;

rate_val.val1 = rate;
	sensor_attr_set(hx711_dev,
			HX711_SENSOR_CHAN_WEIGHT,
			SENSOR_ATTR_SAMPLING_FREQUENCY,
			&rate_val);
}

void measure(void)
{
	static struct sensor_value weight;
	int ret;

ret = sensor_sample_fetch(hx711_dev);
	if (ret != 0) {
		LOG_ERR("Cannot take measurement: %d", ret);
	} else {
		sensor_channel_get(hx711_dev, HX711_SENSOR_CHAN_WEIGHT, &weight);
		LOG_INF("Weight: %d.%06d grams", weight.val1, weight.val2);
	}
}

void main(void)
{
	int calibration_weight = 100; // grams
	hx711_dev = DEVICE_DT_GET_ANY(avia_hx711);
	__ASSERT(hx711_dev == NULL, "Failed to get device binding");

LOG_INF("Device is %p, name is %s", hx711_dev, hx711_dev->name);
	LOG_INF("Calculating offset...");
	avia_hx711_tare(hx711_dev, 5);

LOG_INF("Waiting for known weight of %d grams...",
		calibration_weight);

for (int i = 5; i >= 0; i--) {
		LOG_INF(" %d..", i);
		k_msleep(1000);
	}

LOG_INF("Calculating slope...");
	avia_hx711_calibrate(hx711_dev, calibration_weight, 5);

while (true) {
		k_msleep(1000);
		LOG_INF("== Test measure ==");
		LOG_INF("= Setting sampling rate to 10Hz.");
		set_rate(HX711_RATE_10HZ);
		measure();

k_msleep(1000);
		LOG_INF("= Setting sampling rate to 80Hz.");
		set_rate(HX711_RATE_80HZ);
		measure();
	}
}
```
Relevant `prj.conf`:
```ini
CONFIG_SENSOR=y
CONFIG_HX711=y
CONFIG_LOG=y
```

HX711_zephyr_driver

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