Gert Lauritsen / Hx711

Libery for HX711 sensor. This is for measureing the weigth of the keg

Dependents:   Brew_Keg

Hx711.h@0:52c805a049c4, 2016-02-21 (annotated)

Committer:
gert_lauritsen
Date:
Sun Feb 21 11:01:00 2016 +0000
Revision:
0:52c805a049c4
A lib for hx711 SG sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gert_lauritsen 0:52c805a049c4 1 #ifndef HX711_h
gert_lauritsen 0:52c805a049c4 2 #define HX711_h
gert_lauritsen 0:52c805a049c4 3 //Translatet module from arduino to mbed https://codebender.cc/library/HX711#HX711.h
gert_lauritsen 0:52c805a049c4 4
gert_lauritsen 0:52c805a049c4 5 #include "mbed.h"
gert_lauritsen 0:52c805a049c4 6
gert_lauritsen 0:52c805a049c4 7 class HX711
gert_lauritsen 0:52c805a049c4 8 {
gert_lauritsen 0:52c805a049c4 9 private:
gert_lauritsen 0:52c805a049c4 10 DigitalOut _pin_slk; // Power Down and Serial Clock Input Pin
gert_lauritsen 0:52c805a049c4 11 DigitalIn _pin_dout; // Serial Data Output Pin
gert_lauritsen 0:52c805a049c4 12 char GAIN; // amplification factor
gert_lauritsen 0:52c805a049c4 13 long OFFSET; // used for tare weight
gert_lauritsen 0:52c805a049c4 14 float SCALE; // used to return weight in grams, kg, ounces, whatever
gert_lauritsen 0:52c805a049c4 15 public:
gert_lauritsen 0:52c805a049c4 16 // define clock and data pin, channel, and gain factor
gert_lauritsen 0:52c805a049c4 17 // channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B
gert_lauritsen 0:52c805a049c4 18 // gain: 128 or 64 for channel A; channel B works with 32 gain factor only
gert_lauritsen 0:52c805a049c4 19 HX711(PinName pin_dout, PinName pin_slk);
gert_lauritsen 0:52c805a049c4 20
gert_lauritsen 0:52c805a049c4 21 virtual ~HX711();
gert_lauritsen 0:52c805a049c4 22
gert_lauritsen 0:52c805a049c4 23 // check if HX711 is ready
gert_lauritsen 0:52c805a049c4 24 // from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high. Serial clock
gert_lauritsen 0:52c805a049c4 25 // input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval.
gert_lauritsen 0:52c805a049c4 26
gert_lauritsen 0:52c805a049c4 27
gert_lauritsen 0:52c805a049c4 28 // set the gain factor; takes effect only after a call to read()
gert_lauritsen 0:52c805a049c4 29 // channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain
gert_lauritsen 0:52c805a049c4 30 // depending on the parameter, the channel is also set to either A or B
gert_lauritsen 0:52c805a049c4 31 void set_gain(char gain = 128);
gert_lauritsen 0:52c805a049c4 32
gert_lauritsen 0:52c805a049c4 33 // waits for the chip to be ready and returns a reading
gert_lauritsen 0:52c805a049c4 34 long read();
gert_lauritsen 0:52c805a049c4 35
gert_lauritsen 0:52c805a049c4 36 // returns an average reading; times = how many times to read
gert_lauritsen 0:52c805a049c4 37 long read_average(char times = 10);
gert_lauritsen 0:52c805a049c4 38
gert_lauritsen 0:52c805a049c4 39 // returns (read_average() - OFFSET), that is the current value without the tare weight; times = how many readings to do
gert_lauritsen 0:52c805a049c4 40 double get_value(char times = 1);
gert_lauritsen 0:52c805a049c4 41
gert_lauritsen 0:52c805a049c4 42 // returns get_value() divided by SCALE, that is the raw value divided by a value obtained via calibration
gert_lauritsen 0:52c805a049c4 43 // times = how many readings to do
gert_lauritsen 0:52c805a049c4 44 float get_units(char times = 1);
gert_lauritsen 0:52c805a049c4 45
gert_lauritsen 0:52c805a049c4 46 // set the OFFSET value for tare weight; times = how many times to read the tare value
gert_lauritsen 0:52c805a049c4 47 void tare(char times = 10);
gert_lauritsen 0:52c805a049c4 48
gert_lauritsen 0:52c805a049c4 49 // set the SCALE value; this value is used to convert the raw data to "human readable" data (measure units)
gert_lauritsen 0:52c805a049c4 50 void set_scale(float scale = 1.f);
gert_lauritsen 0:52c805a049c4 51
gert_lauritsen 0:52c805a049c4 52 // set OFFSET, the value that's subtracted from the actual reading (tare weight)
gert_lauritsen 0:52c805a049c4 53 void set_offset(long offset = 0);
gert_lauritsen 0:52c805a049c4 54
gert_lauritsen 0:52c805a049c4 55 // puts the chip into power down mode
gert_lauritsen 0:52c805a049c4 56 void power_down();
gert_lauritsen 0:52c805a049c4 57
gert_lauritsen 0:52c805a049c4 58 // wakes up the chip after power down mode
gert_lauritsen 0:52c805a049c4 59 void power_up();
gert_lauritsen 0:52c805a049c4 60 };
gert_lauritsen 0:52c805a049c4 61
gert_lauritsen 0:52c805a049c4 62 #endif /* HX711_h */