sleep_iot.ino

#include <Wire.h>

#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>

#define USE_SERIAL Serial

ESP8266WiFiMulti WiFiMulti;

#define DEVICE (0x53)      //ADXL345 device address
#define TO_READ (6)        //num of bytes we are going to read each time (two bytes for each axis)

byte buff[TO_READ] ;        //6 bytes buffer for saving data read from the device
char str[512];              //string buffer to transform data before sending it to the serial port
int regAddress = 0x32;      //first axis-acceleration-data register on the ADXL345
int x, y, z;                //three axis acceleration data
int xBias, yBias, zBias;
const int LED_PIN = 9;
const int BUTTON_PIN = 10;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);

  Wire.begin();         // join i2c bus (address optional for master)
    
  //Turning on the ADXL345
  writeTo(DEVICE, 0x2D, 0);      
  writeTo(DEVICE, 0x2D, 16);
  writeTo(DEVICE, 0x2D, 8);
  writeTo(DEVICE, 0x31, 11);

  USE_SERIAL.begin(115200);
  // USE_SERIAL.setDebugOutput(true);

  USE_SERIAL.println();
  USE_SERIAL.println();
  USE_SERIAL.println();

  for(uint8_t t = 4; t > 0; t--) {
    USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
    USE_SERIAL.flush();
    delay(1000);
  }

  WiFiMulti.addAP("McDonan", "21091996");
  xBias = 0;
  yBias=0;
  zBias=0;
  for(int i = 0; i<30; i++){
    calibrateAccelerometer();
  }
  xBias /= 30;
  yBias /= 30;
  zBias /= 30;

  if((WiFiMulti.run() == WL_CONNECTED)) {
    HTTPClient http;

    USE_SERIAL.print("[HTTP] begin...\n");
    // configure traged server and url
    //http.begin("https://192.168.1.12/test.html", "7a 9c f4 db 40 d3 62 5a 6e 21 bc 5c cc 66 c8 3e a1 45 59 38"); //HTTPS
    http.begin("http://172.20.10.3/startSleepRound.php"); //HTTP

    USE_SERIAL.print("[HTTP] GET startSleepRound...\n");
    // start connection and send HTTP header
    int httpCode = http.GET();

    // httpCode will be negative on error
    if(httpCode > 0) {
      // HTTP header has been send and Server response header has been handled
      USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);

      // file found at server
      if(httpCode == HTTP_CODE_OK) {
        String payload = http.getString();
        USE_SERIAL.println(payload);
      }
    } else {
      USE_SERIAL.printf("[HTTP] GET... startSleepRound failed, error: %s\n", http.errorToString(httpCode).c_str());
    }
    http.end();
  }
}

void loop() {
  readFrom(DEVICE, regAddress, TO_READ, buff); //read the acceleration data from the ADXL345
                                              //each axis reading comes in 10 bit resolution, ie 2 bytes.  Least Significat Byte first!!
                                              //thus we are converting both bytes in to one int

  for(int i = 0; i < 6; i++){
    USE_SERIAL.print(buff[i],BIN);
    USE_SERIAL.print(" ");
  }
  USE_SERIAL.println("");

  x = (((int)buff[1]) << 8) | buff[0];   
  y = (((int)buff[3])<< 8) | buff[2];
  z = (((int)buff[5]) << 8) | buff[4];
  short xx =(short)x;
  short yy = (short)y;
  short zz = (short)z;

  //we send the x y z values as a string to the serial port
  USE_SERIAL.print("The acceleration info of x, y, z are:");
  sprintf(str, "%d %d %d", x, y, z);  
  USE_SERIAL.print(str);
  USE_SERIAL.write(10);
  //Roll & Pitch calculate
  RP_calculate();
  USE_SERIAL.println("");
  USE_SERIAL.print(xx);
  USE_SERIAL.print(" ");
  USE_SERIAL.print(yy);
  USE_SERIAL.print(" ");
  USE_SERIAL.print(zz);
  //It appears that delay is needed in order not to clog the port

  USE_SERIAL.print(" ");
  USE_SERIAL.print(xx,BIN);
  USE_SERIAL.print(" ");
  USE_SERIAL.print(yy,BIN);
  USE_SERIAL.print(" ");
  USE_SERIAL.print(zz,BIN);
  USE_SERIAL.println("");
  
  USE_SERIAL.print("two's complements are : ");
  sprintf(str, "%d %d %d", xx, yy, zz);  
  USE_SERIAL.print(str);
  USE_SERIAL.write(10);
  //Roll & Pitch calculate
  RP_calculate();
  USE_SERIAL.println("");
  delay(1000);
  // wait for WiFi connection
  String link1 = "http://172.20.10.3/sqlAddData.php?ax=";
  String link2 = "&ay=";
  String link3 = "&az=";
  String ax = (String) (xx-xBias);
  String ay = (String) (yy-yBias);
  String az = (String) (zz-zBias);
  if((WiFiMulti.run() == WL_CONNECTED)) {

    HTTPClient http;

    USE_SERIAL.print("[HTTP] begin...\n");
    // configure traged server and url
    //http.begin("https://192.168.1.12/test.html", "7a 9c f4 db 40 d3 62 5a 6e 21 bc 5c cc 66 c8 3e a1 45 59 38"); //HTTPS
    http.begin(link1+ax+link2+ay+link3+az); //HTTP
    USE_SERIAL.print("[HTTP] GET...\n");
    // start connection and send HTTP header
    int httpCode = http.GET();

    // httpCode will be negative on error
    if(httpCode > 0) {
      // HTTP header has been send and Server response header has been handled
      USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);

      // file found at server
      if(httpCode == HTTP_CODE_OK) {
        String payload = http.getString();
        USE_SERIAL.println(payload);
      }
    } else {
      USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }
    http.end();
  }
  delay(1000);
}

void writeTo(int device, byte address, byte val) {
  Wire.beginTransmission(device); //start transmission to device 
  Wire.write(address);        // send register address
  Wire.write(val);        // send value to write
  Wire.endTransmission(); //end transmission
}

//reads num bytes starting from address register on device in to buff array
void readFrom(int device, byte address, int num, byte buff[]) {
  Wire.beginTransmission(device); //start transmission to device 
  Wire.write(address);        //sends address to read from
  Wire.endTransmission(); //end transmission

  Wire.beginTransmission(device); //start transmission to device
  Wire.requestFrom(device, num);    // request 6 bytes from device

  int i = 0;
  while(Wire.available()) {   //device may send less than requested (abnormal)
    buff[i] = Wire.read(); // receive a byte
    i++;
  }
  Wire.endTransmission(); //end transmission
}

//calculate the Roll&Pitch
void RP_calculate(){
  double x_Buff = float(x);
  double y_Buff = float(y);
  double z_Buff = float(z);
}

void calibrateAccelerometer() {
  //Take a number of readings and average them
  //to calculate any bias the accelerometer may have.
  readFrom(DEVICE, regAddress, TO_READ, buff);
  x = (((int)buff[1]) << 8) | buff[0];   
  y = (((int)buff[3])<< 8) | buff[2];
  z = (((int)buff[5]) << 8) | buff[4];
  short xx =(short)x;
  short yy = (short)y;
  short zz = (short)z;
  xBias = xx+xBias;
  yBias = yy+yBias;
  zBias = zz+zBias;
}