# HX711 Module

This module provides access to an HX711 load cell amplifier/ADC.  The HX711 is an inexpensive 24bit ADC with programmable 128x, 64x, and 32x gain.  Currently only channel A at 128x gain is supported.

Note: To save ROM image space, the hx711 module is not compiled into the firmware by default.


## hx711.init()

Initialize io pins for hx711 clock and data.

#### Syntax
`hx711.init(clk,data)`

#### Parameters
- `clk` pin the hx711 clock signal is connected to.
- `data` pin the hx711 data signal is connected to.

#### Returns
`nil`

#### Example
```lua
-- Initialize the hx711 with clk on pin 5 and data on pin 6
hx711.init(5,6)
```
## hx711.read()

Read digital loadcell ADC value.

#### Syntax
`hx711.read(mode)`

#### Parameters
- `mode` ADC mode.  This parameter is currently ignored and reserved to ensure backward compatability if support for additional modes is added.  Currently only channel A @ 128 gain is supported.

|mode | channel | gain |
|-----|---------|------|
| 0   | A       | 128  |

#### Returns
a number (24 bit signed ADC value extended to the machine int size.)

#### Example
```lua
-- Read ch A with 128 gain.
raw_data = hx711.read(0)
```