Safe & Sound Wearables - Trackable Safety Helmet for Miners #6: Sensor Board

I was absent last two weeks, I hope I will catch up the following weeks In the last post, I have written about the socket programming and wifi boosterpack. The next think I need to hook up the sensor boosterpack but there were problems. Although bare-metal code for sensor boosterpack works, the sample code for the TI-RTOS didn't work. I didn't want to use the bare-metal code because it was pretty long and timing can be a problem if I combine wifi module and some other stuff. Also, I don't have much time so I came up with separating the sensor board and create sensor board with Arduino.

I have used TMP102 digital temperature sensor and ADXL345 accelerometer. ADXL345 makes things easier because it has an Arduino library wich can detect the inactivity. The code below is getting sensors data and send temperature and activity/inactivity over the serial port. I will connect the serial port to MSP432 and send the data over Wi-Fi boosterpack. I will add a pressure sensor and buzzer to warn the user.

I also got the helmet. I hope this week I will do more work and catch up.

/*  ********************************************* 
 *  SparkFun_ADXL345_Example
 *  Triple Axis Accelerometer Breakout - ADXL345 
 *  Hook Up Guide Example 
 *  
 *  Utilizing Sparkfun's ADXL345 Library
 *  Bildr ADXL345 source file modified to support 
 *  both I2C and SPI Communication
 *  
 *  E.Robert @ SparkFun Electronics
 *  Created: Jul 13, 2016
 *  Updated: Sep 06, 2016
 *  
 *  Development Environment Specifics:
 *  Arduino 1.6.11
 *  
 *  Hardware Specifications:
 *  SparkFun ADXL345
 *  Arduino Uno
 *  *********************************************/


#include <SparkFun_ADXL345.h>  // SparkFun ADXL345 Library
#include <Wire.h>             // Used to establied serial communication on the I2C bus
#include "SparkFunTMP102.h"  // Used to send and recieve specific information from our sensor




/*********** COMMUNICATION SELECTION  for ADXL345 ***********/
/*    Comment Out The One You Are Not Using    */
ADXL345 adxl = ADXL345(10);           // USE FOR SPI COMMUNICATION, ADXL345(CS_PIN);
//ADXL345 adxl = ADXL345();             // USE FOR I2C COMMUNICATION


/****************** INTERRUPT for ADXL345 ******************/
/*      Uncomment If Attaching Interrupt       */
//int interruptPin = 2;                 // Setup pin 2 to be the interrupt pin (for most Arduino Boards)




/*********** Initialize  TMP102 ***********/
TMP102 sensor0(0x48); // Initialize sensor at I2C address 0x48
const int ALERT_PIN = A3;




void TMP102Init()
{
  
  pinMode(ALERT_PIN,INPUT);  // Declare alertPin as an input for TMP102
  sensor0.begin();  // Join I2C bus
  // Initialize sensor0 settings
  // These settings are saved in the sensor, even if it loses power
  
  // set the number of consecutive faults before triggering alarm.
  // 0-3: 0:1 fault, 1:2 faults, 2:4 faults, 3:6 faults.
  sensor0.setFault(0);  // Trigger alarm immediately
  
  // set the polarity of the Alarm. (0:Active LOW, 1:Active HIGH).
  sensor0.setAlertPolarity(1); // Active HIGH
  
  // set the sensor in Comparator Mode (0) or Interrupt Mode (1).
  sensor0.setAlertMode(0); // Comparator Mode.
  
  // set the Conversion Rate (how quickly the sensor gets a new reading)
  //0-3: 0:0.25Hz, 1:1Hz, 2:4Hz, 3:8Hz
  sensor0.setConversionRate(2);
  
  //set Extended Mode.
  //0:12-bit Temperature(-55C to +128C) 1:13-bit Temperature(-55C to +150C)
  sensor0.setExtendedMode(0);


  //set T_HIGH, the upper limit to trigger the alert on
  sensor0.setHighTempF(85.0);  // set T_HIGH in F
  //sensor0.setHighTempC(29.4); // set T_HIGH in C
  
  //set T_LOW, the lower limit to shut turn off the alert
  sensor0.setLowTempF(84.0);  // set T_LOW in F
  //sensor0.setLowTempC(26.67); // set T_LOW in C
  
}




void ADXLInit()
{
  adxl.powerOn();                     // Power on the ADXL345


  adxl.setRangeSetting(16);           // Give the range settings
                                      // Accepted values are 2g, 4g, 8g or 16g
                                      // Higher Values = Wider Measurement Range
                                      // Lower Values = Greater Sensitivity


  adxl.setSpiBit(0);                  // Configure the device to be in 4 wire SPI mode when set to '0' or 3 wire SPI mode when set to 1
                                      // Default: Set to 1
                                      // SPI pins on the ATMega328: 11, 12 and 13 as reference in SPI Library 
   
  adxl.setActivityXYZ(1, 0, 0);       // Set to activate movement detection in the axes "adxl.setActivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
  adxl.setActivityThreshold(75);      // 62.5mg per increment   // Set activity   // Inactivity thresholds (0-255)

  adxl.setInactivityXYZ(1, 0, 0);     // Set to detect inactivity in all the axes "adxl.setInactivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
  adxl.setInactivityThreshold(75);    // 62.5mg per increment   // Set inactivity // Inactivity thresholds (0-255)
  adxl.setTimeInactivity(10);         // How many seconds of no activity is inactive?


  adxl.setTapDetectionOnXYZ(0, 0, 1); // Detect taps in the directions turned ON "adxl.setTapDetectionOnX(X, Y, Z);" (1 == ON, 0 == OFF)

  // Set values for what is considered a TAP and what is a DOUBLE TAP (0-255)
  adxl.setTapThreshold(50);           // 62.5 mg per increment
  adxl.setTapDuration(15);            // 625 μs per increment
  adxl.setDoubleTapLatency(80);       // 1.25 ms per increment
  adxl.setDoubleTapWindow(200);       // 1.25 ms per increment

  // Set values for what is considered FREE FALL (0-255)
  adxl.setFreeFallThreshold(7);       // (5 - 9) recommended - 62.5mg per increment
  adxl.setFreeFallDuration(30);       // (20 - 70) recommended - 5ms per increment

  // Setting all interupts to take place on INT1 pin
  //adxl.setImportantInterruptMapping(1, 1, 1, 1, 1);     // Sets "adxl.setEveryInterruptMapping(single tap, double tap, free fall, activity, inactivity);" 
                                                        // Accepts only 1 or 2 values for pins INT1 and INT2. This chooses the pin on the ADXL345 to use for Interrupts.
                                                        // This library may have a problem using INT2 pin. Default to INT1 pin.
  
  // Turn on Interrupts for each mode (1 == ON, 0 == OFF)
  adxl.InactivityINT(1);
  adxl.ActivityINT(1);
  adxl.FreeFallINT(1);
  adxl.doubleTapINT(1);
  adxl.singleTapINT(1);
  
//attachInterrupt(digitalPinToInterrupt(interruptPin), ADXL_ISR, RISING);   // Attach Interrupt
}


/******************** SETUP ********************/
void setup(){
  
  Serial.begin(9600);                 // Start the serial terminal


  TMP102Init();
  ADXLInit();


}






/****************** MAIN CODE ******************/
/*     Accelerometer Readings and Interrupt    */
void loop(){


  float temperature;
  boolean alertPinState, alertRegisterState;
  
  // Accelerometer Readings
  int x,y,z;   
  adxl.readAccel(&x, &y, &z);         // Read the accelerometer values and store them in variables declared above x,y,z


  // Output Results to Serial
  /* UNCOMMENT TO VIEW X Y Z ACCELEROMETER VALUES */  
  //Serial.print(x);
  //Serial.print(", ");
  //Serial.print(y);
  //Serial.print(", ");
  //Serial.println(z); 
  
  ADXL_ISR();
  // You may also choose to avoid using interrupts and simply run the functions within ADXL_ISR(); 
  //  and place it within the loop instead.  
  // This may come in handy when it doesn't matter when the action occurs. 






 // Turn sensor on to start temperature measurement.
  // Current consumtion typically ~10uA.
  sensor0.wakeup();


  // read temperature data
  temperature = sensor0.readTempF();
  //temperature = sensor0.readTempC();


  // Check for Alert
  alertPinState = digitalRead(ALERT_PIN); // read the Alert from pin
  alertRegisterState = sensor0.alert();   // read the Alert from register
  
  // Place sensor in sleep mode to save power.
  // Current consumtion typically <0.5uA.
  sensor0.sleep();


  // Print temperature and alarm state
  Serial.print("Temperature: ");
  Serial.print(temperature);
  
 // Serial.print("\tAlert Pin: ");
 // Serial.print(alertPinState);
  
 // Serial.print("\tAlert Register: ");
 // Serial.println(alertRegisterState);
  
  delay(1000);  // Wait 1000ms




}


/********************* ISR *********************/
/* Look for Interrupts and Triggered Action    */
void ADXL_ISR() {
  
  // getInterruptSource clears all triggered actions after returning value
  // Do not call again until you need to recheck for triggered actions
  byte interrupts = adxl.getInterruptSource();
  
  // Free Fall Detection
  if(adxl.triggered(interrupts, ADXL345_FREE_FALL)){
    Serial.println("*** FREE FALL ***");
    //add code here to do when free fall is sensed
  } 
  
  // Inactivity
  if(adxl.triggered(interrupts, ADXL345_INACTIVITY)){
    Serial.println("*** INACTIVITY ***");
     //add code here to do when inactivity is sensed
  }
  
  // Activity
  if(adxl.triggered(interrupts, ADXL345_ACTIVITY)){
    Serial.println("*** ACTIVITY ***"); 
     //add code here to do when activity is sensed
  }
  
  // Double Tap Detection
  if(adxl.triggered(interrupts, ADXL345_DOUBLE_TAP)){
    Serial.println("*** DOUBLE TAP ***");
     //add code here to do when a 2X tap is sensed
  }
  
  // Tap Detection
  if(adxl.triggered(interrupts, ADXL345_SINGLE_TAP)){
    Serial.println("*** TAP ***");
     //add code here to do when a tap is sensed
  } 
}