diff --git a/datasheet load_cell.jpg b/datasheet/datasheet load_cell.jpg similarity index 100% rename from datasheet load_cell.jpg rename to datasheet/datasheet load_cell.jpg diff --git a/datasheet/hx711_english.pdf b/datasheet/hx711_english.pdf new file mode 100644 index 0000000..b55347a Binary files /dev/null and b/datasheet/hx711_english.pdf differ diff --git a/load_cell.jpg b/datasheet/load_cell.jpg similarity index 100% rename from load_cell.jpg rename to datasheet/load_cell.jpg diff --git a/mechanical load_cell.jpg b/datasheet/mechanical load_cell.jpg similarity index 100% rename from mechanical load_cell.jpg rename to datasheet/mechanical load_cell.jpg diff --git a/library/HX711-master/.gitignore b/library/HX711-master/.gitignore new file mode 100755 index 0000000..620d3dc --- /dev/null +++ b/library/HX711-master/.gitignore @@ -0,0 +1,13 @@ +# Compiled Object files +*.slo +*.lo +*.o + +# Compiled Dynamic libraries +*.so +*.dylib + +# Compiled Static libraries +*.lai +*.la +*.a diff --git a/library/HX711-master/HX711.cpp b/library/HX711-master/HX711.cpp new file mode 100755 index 0000000..804c01b --- /dev/null +++ b/library/HX711-master/HX711.cpp @@ -0,0 +1,127 @@ +#include +#include + +HX711::HX711(byte dout, byte pd_sck, byte gain) { + PD_SCK = pd_sck; + DOUT = dout; + + pinMode(PD_SCK, OUTPUT); + pinMode(DOUT, INPUT); + + set_gain(gain); +} + +HX711::~HX711() { + +} + +bool HX711::is_ready() { + return digitalRead(DOUT) == LOW; +} + +void HX711::set_gain(byte gain) { + switch (gain) { + case 128: // channel A, gain factor 128 + GAIN = 1; + break; + case 64: // channel A, gain factor 64 + GAIN = 3; + break; + case 32: // channel B, gain factor 32 + GAIN = 2; + break; + } + + digitalWrite(PD_SCK, LOW); + read(); +} + +long HX711::read() { + // wait for the chip to become ready + while (!is_ready()); + + unsigned long value = 0; + byte data[3] = { 0 }; + byte filler = 0x00; + + // pulse the clock pin 24 times to read the data + data[2] = shiftIn(DOUT, PD_SCK, MSBFIRST); + data[1] = shiftIn(DOUT, PD_SCK, MSBFIRST); + data[0] = shiftIn(DOUT, PD_SCK, MSBFIRST); + + // set the channel and the gain factor for the next reading using the clock pin + for (unsigned int i = 0; i < GAIN; i++) { + digitalWrite(PD_SCK, HIGH); + digitalWrite(PD_SCK, LOW); + } + + // Datasheet indicates the value is returned as a two's complement value + // Flip all the bits + data[2] = ~data[2]; + data[1] = ~data[1]; + data[0] = ~data[0]; + + // Replicate the most significant bit to pad out a 32-bit signed integer + if ( data[2] & 0x80 ) { + filler = 0xFF; + } else if ((0x7F == data[2]) && (0xFF == data[1]) && (0xFF == data[0])) { + filler = 0xFF; + } else { + filler = 0x00; + } + + // Construct a 32-bit signed integer + value = ( static_cast(filler) << 24 + | static_cast(data[2]) << 16 + | static_cast(data[1]) << 8 + | static_cast(data[0]) ); + + // ... and add 1 + return static_cast(++value); +} + +long HX711::read_average(byte times) { + long sum = 0; + for (byte i = 0; i < times; i++) { + sum += read(); + } + return sum / times; +} + +double HX711::get_value(byte times) { + return read_average(times) - OFFSET; +} + +float HX711::get_units(byte times) { + return get_value(times) / SCALE; +} + +void HX711::tare(byte times) { + double sum = read_average(times); + set_offset(sum); +} + +void HX711::set_scale(float scale) { + SCALE = scale; +} + +float HX711::get_scale() { + return SCALE; +} + +void HX711::set_offset(long offset) { + OFFSET = offset; +} + +long HX711::get_offset() { + return OFFSET; +} + +void HX711::power_down() { + digitalWrite(PD_SCK, LOW); + digitalWrite(PD_SCK, HIGH); +} + +void HX711::power_up() { + digitalWrite(PD_SCK, LOW); +} diff --git a/library/HX711-master/HX711.h b/library/HX711-master/HX711.h new file mode 100755 index 0000000..f5fe8b6 --- /dev/null +++ b/library/HX711-master/HX711.h @@ -0,0 +1,72 @@ +#ifndef HX711_h +#define HX711_h + +#if ARDUINO >= 100 +#include "Arduino.h" +#else +#include "WProgram.h" +#endif + +class HX711 +{ + private: + byte PD_SCK; // Power Down and Serial Clock Input Pin + byte DOUT; // Serial Data Output Pin + byte GAIN; // amplification factor + long OFFSET; // used for tare weight + float SCALE; // used to return weight in grams, kg, ounces, whatever + + public: + // define clock and data pin, channel, and gain factor + // channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B + // gain: 128 or 64 for channel A; channel B works with 32 gain factor only + HX711(byte dout, byte pd_sck, byte gain = 128); + + virtual ~HX711(); + + // check if HX711 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. + bool is_ready(); + + // 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 + void set_gain(byte gain = 128); + + // waits for the chip to be ready and returns a reading + long read(); + + // returns an average reading; times = how many times to read + long read_average(byte times = 10); + + // returns (read_average() - OFFSET), that is the current value without the tare weight; times = how many readings to do + double get_value(byte times = 1); + + // returns get_value() divided by SCALE, that is the raw value divided by a value obtained via calibration + // times = how many readings to do + float get_units(byte times = 1); + + // set the OFFSET value for tare weight; times = how many times to read the tare value + void tare(byte times = 10); + + // set the SCALE value; this value is used to convert the raw data to "human readable" data (measure units) + void set_scale(float scale = 1.f); + + // get the current SCALE + float get_scale(); + + // set OFFSET, the value that's subtracted from the actual reading (tare weight) + void set_offset(long offset = 0); + + // get the current OFFSET + long get_offset(); + + // puts the chip into power down mode + void power_down(); + + // wakes up the chip after power down mode + void power_up(); +}; + +#endif /* HX711_h */ diff --git a/library/HX711-master/LICENSE b/library/HX711-master/LICENSE new file mode 100755 index 0000000..d7f1051 --- /dev/null +++ b/library/HX711-master/LICENSE @@ -0,0 +1,339 @@ +GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/library/HX711-master/README.md b/library/HX711-master/README.md new file mode 100755 index 0000000..0122596 --- /dev/null +++ b/library/HX711-master/README.md @@ -0,0 +1,30 @@ +HX711 +===== + +An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for Weight Scales. + +This is my humble attempt at creating an Arduino library for this ADC: +http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf + +Other libraries exist, including this very good one, which I first used and which is the starting point for my library: +https://github.com/aguegu/ardulibs/tree/master/hx711 + +Although other libraries exist, I needed a slightly different approach, so here's how my library is different than others: + +1. It provides a tare() function, which "resets" the scale to 0. Many other implementations calculate the tare weight when the ADC is initialized only. I needed a way to be able to set the tare weight at any time. Use case: place an empty container on the scale, call tare() to reset the readings to 0, fill the container and get the weight of the content. + +2. It provides a power_down() function, to put the ADC into a low power mode. According to the datasheet, "When PD_SCK pin changes from low to high and stays at high for longer than 60μs, HX711 enters power down mode". Use case: battery powered scales. Accordingly, there is a power_up() function to get the chip out of the low power mode. + +3. It has a set_gain(byte gain) function that allows you to set the gain factor and select the channel. According to the datasheet, "Channel A can be programmed with a gain of 128 or 64, corresponding to a full-scale differential input voltage of ±20mV or ±40mV respectively, when a 5V supply is connected to AVDD analog power supply pin. Channel B has a fixed gain of 32.". The same function is used to select the channel A or channel B, by passing 128 or 64 for channel A, or 32 for channel B as the parameter. The default value is 128, which means "channel A with a gain factor of 128", so one can simply call set_gain(). Also, the function is called from the constructor. + +4. The constructor has an extra parameter "gain" that allows you to set the gain factor and channel. The constructor calls the "set_gain" function mentioned above. + +5. The "get_value" and "get_units" functions can receive an extra parameter "times", and they will return the average of multiple readings instead of a single reading. + +How to Calibrate Your Scale + +1. Call set_scale() with no parameter. +2. Call tare() with no parameter. +3. Place a known weight on the scale and call get_units(10). +4. Divide the result in step 3 to your known weight. You should get about the parameter you need to pass to set_scale. +5. Adjust the parameter in step 4 until you get an accurate reading. diff --git a/library/HX711-master/examples/HX711Serial/HX711Serial.ino b/library/HX711-master/examples/HX711Serial/HX711Serial.ino new file mode 100755 index 0000000..dbb6436 --- /dev/null +++ b/library/HX711-master/examples/HX711Serial/HX711Serial.ino @@ -0,0 +1,56 @@ +#include "HX711.h" + +// HX711.DOUT - pin #A1 +// HX711.PD_SCK - pin #A0 + +HX711 scale(A1, A0); // parameter "gain" is ommited; the default value 128 is used by the library + +void setup() { + Serial.begin(38400); + Serial.println("HX711 Demo"); + + Serial.println("Before setting up the scale:"); + Serial.print("read: \t\t"); + Serial.println(scale.read()); // print a raw reading from the ADC + + Serial.print("read average: \t\t"); + Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC + + Serial.print("get value: \t\t"); + Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) + + Serial.print("get units: \t\t"); + Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided + // by the SCALE parameter (not set yet) + + scale.set_scale(2280.f); // this value is obtained by calibrating the scale with known weights; see the README for details + scale.tare(); // reset the scale to 0 + + Serial.println("After setting up the scale:"); + + Serial.print("read: \t\t"); + Serial.println(scale.read()); // print a raw reading from the ADC + + Serial.print("read average: \t\t"); + Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC + + Serial.print("get value: \t\t"); + Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() + + Serial.print("get units: \t\t"); + Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided + // by the SCALE parameter set with set_scale + + Serial.println("Readings:"); +} + +void loop() { + Serial.print("one reading:\t"); + Serial.print(scale.get_units(), 1); + Serial.print("\t| average:\t"); + Serial.println(scale.get_units(10), 1); + + scale.power_down(); // put the ADC in sleep mode + delay(5000); + scale.power_up(); +} \ No newline at end of file diff --git a/library/HX711-master/library.json b/library/HX711-master/library.json new file mode 100755 index 0000000..d4c9452 --- /dev/null +++ b/library/HX711-master/library.json @@ -0,0 +1,17 @@ +{ + "name": "HX711", + "keywords": "hx711, scale, weight", + "description": "An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for Weight Scales.", + "repository": { + "type": "git", + "url": "https://github.com/bogde/HX711.git" + }, + "version": "0.1", + "exclude": "tests", + "examples": "examples/*/*.ino", + "frameworks": "arduino", + "platforms": [ + "atmelavr", + "espressif" + ] +}