125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
#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 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("Tanner");
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bledis.setModel("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());
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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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}
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