datasheet & lib

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

library/HX711-master/HX711.cpp

@@ -0,0 +1,127 @@
+#include <Arduino.h>
+#include <HX711.h>
+
+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<unsigned long>(filler) << 24
+            | static_cast<unsigned long>(data[2]) << 16
+            | static_cast<unsigned long>(data[1]) << 8
+            | static_cast<unsigned long>(data[0]) );
+
+    // ... and add 1
+    return static_cast<long>(++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);
+}

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 */

library/HX711-master/LICENSE

@@ -0,0 +1,339 @@
+GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
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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.

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();
+}

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"
+    ]
+}