HX711 Class Reference

API for the HX711 Analog-to-Digital Converter. More...

Detailed Description

• ID: hx711
• Name: HX711 Analog-to-Digital Converter
• Category: electric
• Manufacturer: generic
• Link: http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf
• Connection: gpio

HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weight scales and industrial control applications to interface directly with a bridge sensor. This module was tested on the Intel(R) Galileo Gen 2 board.

#include "hx711.hpp"

int
main(int argc, char **argv)
{
    upm::HX711 *scale = new upm::HX711(3, 2);

    // 2837: value obtained via calibration
    scale->setScale(2837);
    scale->tare();
    std::cout << scale->getUnits() << std::endl;

    return 0;
}

Public Member Functions
	HX711 (int data, int sck, uint8_t gain=128)
	~HX711 ()
unsigned long	read ()
void	setGain (uint8_t gain=128)
unsigned long	readAverage (uint8_t times=10)
double	getValue (uint8_t times=10)
float	getUnits (uint8_t times=1)
void	tare (uint8_t times=10)
void	setScale (float scale=1.f)

Constructor & Destructor Documentation

HX711	(	int	data,
		int	sck,
		uint8_t	gain = 128
	)

HX711 constructor

Parameters

data	Defines the data pin
sck	Defines the clock pin
gain	Defines the gain factor Valid values are 128 or 64 for channel A; channel B works with a 32-gain factor only

~HX711

(

)

HX711 destructor

Member Function Documentation

unsigned long read

(

)

Waits for the chip to be ready and returns a reading

Returns

Raw ADC reading

void setGain

(

uint8_t

gain = 128

)

Sets 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 factor depending on the parameter; the channel is also set to either A or B

Parameters

gain	Defines the gain factor

unsigned long readAverage

(

uint8_t

times = 10

)

Returns an average reading

Parameters

times

Defines how many reading to do

Returns

Average reading

double getValue

(

uint8_t

times = 10

)

Returns (readAverage() - OFFSET)

Parameters

times

Defines how many readings to do

Returns

Current value without the tare weight

float getUnits

(

uint8_t

times = 1

)

Returns getValue() divided by SCALE

Parameters

times

Defines how many readings to do

Returns

Raw value divided by a value obtained via calibration

void tare

(

uint8_t

times = 10

)

Sets the OFFSET value for the tare weight

Parameters

times

Defines how many times to read the tare value

void setScale

(

float

scale = 1.f

)

Sets the SCALE value This value is used to convert the raw data to human-readable data (measurement units)

Parameters

scale

Value obtained via calibration

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The documentation for this class was generated from the following files:

• /iotdk/jenkins/workspace/upm-doc-stable/src/hx711/hx711.hpp
• /iotdk/jenkins/workspace/upm-doc-stable/src/hx711/hx711.cxx