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#include <bluefruit.h> |
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#include <Adafruit_LittleFS.h> |
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#include <InternalFileSystem.h> |
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#include "HX711.h" |
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//#define calibration_factor -6980.0 // black wired load cell
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#define calibration_factor -5760.0 // orange wired load cell
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#define DOUT 30 |
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#define CLK 27 |
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HX711 scale; |
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// BLE Service
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BLEDfu bledfu; // OTA DFU service
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BLEDis bledis; // device information
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BLEUart bleuart; // uart over ble
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BLEBas blebas; // battery
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void setup() |
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{ |
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Serial.begin(115200); |
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scale.begin(DOUT, CLK); |
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digitalWrite(CLK, LOW); // hangs without this
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scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
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scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
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Serial.println(""); |
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Serial.println(""); |
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Serial.println("Load Cell Demo"); |
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Serial.println("--------------\n"); |
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Bluefruit.autoConnLed(true); |
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Bluefruit.configPrphBandwidth(BANDWIDTH_MAX); |
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Bluefruit.begin(); |
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Bluefruit.setTxPower(4); |
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Bluefruit.Periph.setConnectCallback(connect_callback); |
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Bluefruit.Periph.setDisconnectCallback(disconnect_callback); |
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bledfu.begin(); |
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bledis.setManufacturer("Odai"); |
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bledis.setModel("TUT Load Cell"); |
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bledis.begin(); |
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bleuart.begin(); |
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blebas.begin(); |
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blebas.write(100); |
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startAdv(); |
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Serial.println("Please use Adafruit's Bluefruit LE app to connect in UART mode"); |
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} |
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void startAdv(void) |
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{ |
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// Advertising packet
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Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE); |
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Bluefruit.Advertising.addTxPower(); |
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// Include bleuart 128-bit uuid
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Bluefruit.Advertising.addService(bleuart); |
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// Secondary Scan Response packet (optional)
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// Since there is no room for 'Name' in Advertising packet
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Bluefruit.ScanResponse.addName(); |
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/* Start Advertising
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* - Enable auto advertising if disconnected |
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* - Interval: fast mode = 20 ms, slow mode = 152.5 ms |
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* - Timeout for fast mode is 30 seconds |
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* - Start(timeout) with timeout = 0 will advertise forever (until connected) |
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*
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* For recommended advertising interval |
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* https://developer.apple.com/library/content/qa/qa1931/_index.html
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*/ |
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Bluefruit.Advertising.restartOnDisconnect(true); |
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Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
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Bluefruit.Advertising.setFastTimeout(30); // number of seconds in fast mode
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Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds
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} |
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void loop() |
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{ |
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char buf[100] = ""; |
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int reading = (int) scale.get_units(); |
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String message = String(reading) + "\n"; |
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message.toCharArray(buf, message.length()+1); |
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bleuart.write(buf, message.length()+1); |
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delay(50); |
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} |
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// callback invoked when central connects
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void connect_callback(uint16_t conn_handle) |
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{ |
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// Get the reference to current connection
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BLEConnection* connection = Bluefruit.Connection(conn_handle); |
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char central_name[32] = { 0 }; |
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connection->getPeerName(central_name, sizeof(central_name)); |
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Serial.print("Connected to "); |
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Serial.println(central_name); |
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} |
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/**
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* Callback invoked when a connection is dropped |
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* @param conn_handle connection where this event happens |
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* @param reason is a BLE_HCI_STATUS_CODE which can be found in ble_hci.h |
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*/ |
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void disconnect_callback(uint16_t conn_handle, uint8_t reason) |
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{ |
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(void) conn_handle; |
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(void) reason; |
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Serial.println(); |
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Serial.print("Disconnected, reason = 0x"); |
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Serial.println(reason, HEX); |
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} |
@ -0,0 +1,80 @@ |
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/*
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Example using the SparkFun HX711 breakout board with a scale |
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By: Nathan Seidle |
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SparkFun Electronics |
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Date: November 19th, 2014 |
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License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license). |
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This is the calibration sketch. Use it to determine the calibration_factor that the main example uses. It also |
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outputs the zero_factor useful for projects that have a permanent mass on the scale in between power cycles. |
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Setup your scale and start the sketch WITHOUT a weight on the scale |
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Once readings are displayed place the weight on the scale |
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Press +/- or a/z to adjust the calibration_factor until the output readings match the known weight |
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Use this calibration_factor on the example sketch |
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This example assumes pounds (lbs). If you prefer kilograms, change the Serial.print(" lbs"); line to kg. The |
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calibration factor will be significantly different but it will be linearly related to lbs (1 lbs = 0.453592 kg). |
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Your calibration factor may be very positive or very negative. It all depends on the setup of your scale system |
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and the direction the sensors deflect from zero state |
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This example code uses bogde's excellent library: https://github.com/bogde/HX711
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bogde's library is released under a GNU GENERAL PUBLIC LICENSE |
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Arduino pin 2 -> HX711 CLK |
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3 -> DOUT |
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5V -> VCC |
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GND -> GND |
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Most any pin on the Arduino Uno will be compatible with DOUT/CLK. |
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The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine. |
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*/ |
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#include "HX711.h" |
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#define DOUT 30 |
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#define CLK 27 |
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HX711 scale; |
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float calibration_factor = -7050; //-7050 worked for my 440lb max scale setup
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void setup() { |
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Serial.begin(115200); |
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Serial.println("HX711 calibration sketch"); |
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Serial.println("Remove all weight from scale"); |
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Serial.println("After readings begin, place known weight on scale"); |
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Serial.println("Press + or a to increase calibration factor"); |
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Serial.println("Press - or z to decrease calibration factor"); |
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scale.begin(DOUT, CLK); |
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digitalWrite(CLK, LOW); // hangs without this
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scale.set_scale(); |
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scale.tare(); //Reset the scale to 0
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long zero_factor = scale.read_average(); //Get a baseline reading
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Serial.print("Zero factor: "); //This can be used to remove the need to tare the scale. Useful in permanent scale projects.
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Serial.println(zero_factor); |
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} |
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void loop() { |
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scale.set_scale(calibration_factor); //Adjust to this calibration factor
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Serial.print("Reading: "); |
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Serial.print(scale.get_units(), 1); |
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Serial.print(" lbs"); //Change this to kg and re-adjust the calibration factor if you follow SI units like a sane person
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Serial.print(" calibration_factor: "); |
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Serial.print(calibration_factor); |
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Serial.println(); |
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if(Serial.available()) |
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{ |
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char temp = Serial.read(); |
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if(temp == '+' || temp == 'a') |
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calibration_factor += 10; |
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else if(temp == '-' || temp == 'z') |
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calibration_factor -= 10; |
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} |
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} |
@ -0,0 +1,51 @@ |
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/*
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Example using the SparkFun HX711 breakout board with a scale |
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By: Nathan Seidle |
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SparkFun Electronics |
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Date: November 19th, 2014 |
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License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license). |
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This example demonstrates basic scale output. See the calibration sketch to get the calibration_factor for your |
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specific load cell setup. |
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This example code uses bogde's excellent library: https://github.com/bogde/HX711
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bogde's library is released under a GNU GENERAL PUBLIC LICENSE |
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The HX711 does one thing well: read load cells. The breakout board is compatible with any wheat-stone bridge |
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based load cell which should allow a user to measure everything from a few grams to tens of tons. |
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Arduino pin 2 -> HX711 CLK |
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3 -> DAT |
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5V -> VCC |
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GND -> GND |
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The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine. |
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*/ |
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#include "HX711.h" |
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#define calibration_factor -10160.0 //This value is obtained using the SparkFun_HX711_Calibration sketch
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#define DOUT 3 |
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#define CLK 2 |
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HX711 scale; |
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void setup() { |
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Serial.begin(9600); |
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Serial.println("HX711 scale demo"); |
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scale.begin(DOUT, CLK); |
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scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
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scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
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Serial.println("Readings:"); |
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} |
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void loop() { |
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//Serial.print("Reading: ");
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//Serial.print(scale.get_units(), 1); //scale.get_units() returns a float
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//Serial.print(" lbs"); //You can change this to kg but you'll need to refactor the calibration_factor
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//Serial.println();
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Serial.println(scale.get_units(), 1); |
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} |
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