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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
#ifndef HX711_h
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#define HX711_h
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#if ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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class HX711
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{
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private:
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byte PD_SCK; // Power Down and Serial Clock Input Pin
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byte DOUT; // Serial Data Output Pin
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byte GAIN; // amplification factor
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long OFFSET = 0; // used for tare weight
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float SCALE = 1; // used to return weight in grams, kg, ounces, whatever
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public:
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// define clock and data pin, channel, and gain factor
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// channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B
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// gain: 128 or 64 for channel A; channel B works with 32 gain factor only
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HX711(byte dout, byte pd_sck, byte gain = 128);
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HX711();
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virtual ~HX711();
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// Allows to set the pins and gain later than in the constructor
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void begin(byte dout, byte pd_sck, byte gain = 128);
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// check if HX711 is ready
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// from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high. Serial clock
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// input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval.
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bool is_ready();
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// set the gain factor; takes effect only after a call to read()
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// channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain
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// depending on the parameter, the channel is also set to either A or B
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void set_gain(byte gain = 128);
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// waits for the chip to be ready and returns a reading
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long read();
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// returns an average reading; times = how many times to read
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long read_average(byte times = 10);
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// returns (read_average() - OFFSET), that is the current value without the tare weight; times = how many readings to do
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double get_value(byte times = 1);
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// returns get_value() divided by SCALE, that is the raw value divided by a value obtained via calibration
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// times = how many readings to do
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float get_units(byte times = 1);
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// set the OFFSET value for tare weight; times = how many times to read the tare value
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void tare(byte times = 10);
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// set the SCALE value; this value is used to convert the raw data to "human readable" data (measure units)
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void set_scale(float scale = 1.f);
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// get the current SCALE
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float get_scale();
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// set OFFSET, the value that's subtracted from the actual reading (tare weight)
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void set_offset(long offset = 0);
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// get the current OFFSET
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long get_offset();
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// puts the chip into power down mode
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void power_down();
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// wakes up the chip after power down mode
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void power_up();
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};
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#endif /* HX711_h */
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