hx711.hpp

/*
 * Author: Rafael da Mata Neri <rafael.neri@gmail.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#pragma once

#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <mraa/gpio.h>

namespace upm {
      class HX711 {
      public:
            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);
       private:
            mraa_gpio_context m_sckPinCtx; // Power Down and Serial Clock Input Pin
            mraa_gpio_context m_dataPinCtx; // Serial Data Output Pin

            uint8_t GAIN; // amplification factor
            unsigned long OFFSET; // used for tare weight
            float SCALE; // used to return weight in grams, kg, ounces, whatever


            void setOffset(long offset = 0);
     };

}