Martijn Grootens
Library to read out HX711 24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales by AVIA Semiconductor. Tested with K22F with SCK pint at D13 and DT pin at D12
Hx711 Class Reference
Class for communication with the HX711 24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales by AVIA Semiconductor. More...
#include <Hx711.h>
Public Member Functions | |
| Hx711 (PinName pin_sck, PinName pin_dt, int offset, float scale, uint8_t gain=128) | |
| Create an Hx711 ADC object. | |
| Hx711 (PinName pin_sck, PinName pin_dt, uint8_t gain=128) | |
| Create an Hx711 ADC object with zero offset and unit scaling. | |
| bool | is_ready () |
| Check if the sensor is ready from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high. | |
| uint32_t | readRaw () |
| Waits for the chip to be ready and returns a raw int reading. | |
| float | read () |
| Obtain offset and scaled sensor output; i.e. | |
| float | convert_to_real (int val) |
| Convert integer value from chip to offset and scaled real value. | |
| void | power_down () |
| Puts the chip into power down mode. | |
| void | power_up () |
| Wakes up the chip after power down mode. | |
| void | set_gain (uint8_t gain=128) |
| Set the gain factor; takes effect only after a call to read() channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain depending on the parameter, the channel is also set to either A or B Ensures that gain_ = 128, 64 or 32. | |
| uint8_t | get_gain () |
| Obtain current gain. | |
| void | set_scale (float scale=1.0f) |
| Set the scale factor. | |
| float | get_scale () |
| Get sensor scale factor. | |
| void | set_offset (int offset=0) |
| Set the sensor offset. | |
| int | get_offset () |
| Get current sensor offset. | |
Detailed Description
Class for communication with the HX711 24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales by AVIA Semiconductor.
This library is a port of the Arduino library at https://github.com/bogde/HX711 It works with the FRDM K22F.
Definition at line 11 of file Hx711.h.
Constructor & Destructor Documentation
| Hx711 | ( | PinName | pin_sck, |
| PinName | pin_dt, | ||
| int | offset, | ||
| float | scale, | ||
| uint8_t | gain = 128 |
||
| ) |
Create an Hx711 ADC object.
- Parameters:
-
pin_sck PinName of the clock pin (digital output) pin_dt PinName of the data pin (digital input) offset offset for sensor values scale scale factor to obtain real values gain channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B
| Hx711 | ( | PinName | pin_sck, |
| PinName | pin_dt, | ||
| uint8_t | gain = 128 |
||
| ) |
Create an Hx711 ADC object with zero offset and unit scaling.
- Parameters:
-
pin_sck PinName of the clock pin (digital output) pin_dt PinName of the data pin (digital input) gain channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B TODO: constructor overloading is not allowed?
Member Function Documentation
| float convert_to_real | ( | int | val ) |
Convert integer value from chip to offset and scaled real value.
- Parameters:
-
val integer value
- Returns:
- (val - get_offset()) * get_scale()
| int get_offset | ( | ) |
| bool is_ready | ( | ) |
Check if the sensor is ready from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high.
Serial clock input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval.
- Returns:
- true if dt_.read() == LOW TODO: this is not ideal; the programm will hang if the chip never becomes ready...
| float read | ( | ) |
| uint32_t readRaw | ( | ) |
| void set_gain | ( | uint8_t | gain = 128 ) |
Set the gain factor; takes effect only after a call to read() channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain depending on the parameter, the channel is also set to either A or B Ensures that gain_ = 128, 64 or 32.
- Parameters:
-
gain 128, 64 or 32
| void set_offset | ( | int | offset = 0 ) |
Generated on Tue Jul 12 2022 23:49:57 by
1.7.2