Chris Roberts

IoT Refrigerator Tracker

An IoT device used to monitor when a refrigerator is opened. Great for tracking when you are snacking or to catch pesky thieves!

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IoT Refrigerator Tracker

Things used in this project


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Main sketch used in the Refrigerator Monitor
#include <SPI.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <Wire.h>			// Needed by Energia for Tiva C LaunchPad 
#include "OPT3001.h"
#define USE_USCI_B1
#include <Temboo.h>
#include "TembooAccount.h" // Contains Temboo account information

unsigned long epoch; //Variable created to hold epoch time, used for the timestamp in google drive
opt3001 opt3001; //Declare the optical sensor on the Educational booster pack
WiFiClient client;

// The number of times to trigger the action if the condition is met
// We limit this so you won't use all of your Temboo calls while testing
int maxCalls = 10; //Change this value if you want the code to run indefinitely

// The number of times this Choreo has been run so far in this sketch
int calls = 0;

unsigned int readings = 0;
int maxLUX = 100; //Value used to determine which lux values trigger the choreo
int timeZoneShift = -5; //number of hours difference from GMT
void setup() {
  opt3001.begin();//initialize the optical sensor
  int wifiStatus = WL_IDLE_STATUS;

  // Determine if the WiFi Shield is present
  if (WiFi.status() == WL_NO_SHIELD) {

    // If there's no WiFi shield, stop here


  // Try to connect to the local WiFi network
  while(wifiStatus != WL_CONNECTED) {
    wifiStatus = WiFi.begin(WIFI_SSID, WPA_PASSWORD);

    if (wifiStatus == WL_CONNECTED) {
    } else {

  // Initialize pins

  Serial.println("Setup complete.\n");

void loop() {
  //read from the optical sensor
  readings = opt3001.readResult();
  Serial.print("Lux Readings: ");

  if (readings >= maxLUX) {
    if (calls < maxCalls) {
      Serial.println("\nTriggered! Calling appendRow Choreo...");
    } else {
      Serial.println("\nTriggered! Skipping to save Temboo calls. Adjust maxCalls as required.");

void runAppendRow(int input) {
  TembooChoreo AppendRowChoreo(client);

  // Set Temboo account credentials

  // Set Choreo inputs
  String ClientSecretValue = "Replace with your own Secret Value";    //EDIT NEEDED
  AppendRowChoreo.addInput("ClientSecret", ClientSecretValue);
  String RefreshTokenValue = "Replace with your own Refresh token";  // EDIT NEEDED
  AppendRowChoreo.addInput("RefreshToken", RefreshTokenValue);
  String RowDataValue = "=(("+String(epoch)+"+("+timeZoneShift+"*3600))/86400)+25569,"+String(input);
  AppendRowChoreo.addInput("RowData", RowDataValue);
  String SpreadsheetTitleValue = "Replace with Spreadsheet Title";    //EDIT NEEDED
  AppendRowChoreo.addInput("SpreadsheetTitle", SpreadsheetTitleValue);
  String ClientIDValue = "Replace with your Client ID";               //EDIT NEEDED
  AppendRowChoreo.addInput("ClientID", ClientIDValue);

  // Identify the Choreo to run

  // Run the Choreo
  unsigned int returnCode =;

  // Read and print the error message
  while (AppendRowChoreo.available()) {
    char c =;


Used to find epoch time, runs in parallel with fridgeAlarm.ino
 Udp NTP Client
Code adapted from github resource found here:
 Modified 1 July 2014
 by Noah Luskey
 This code is in the public domain.

unsigned int localPort = 2390;      // local port to listen for UDP packets
IPAddress timeServer(129,6,15,30); // NTP server, can be changed.  Other servers can be found at
const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets

// A UDP instance to let us send and receive packets over UDP
WiFiUDP Udp;

void epochSetup()
  delay(10000); //give WiFi time to initialize in the main function

void epochLoop()
  sendNTPpacket(timeServer); // send an NTP packet to a time server
  // wait to see if a reply is available
  if ( Udp.parsePacket() ) {
    // We've received a packet, read the data from it, NTP_PACKET_SIZE); // read the packet into the buffer

    //the timestamp starts at byte 40 of the received packet and is four bytes,
    // or two words, long. First, esxtract the two words:

    unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
    unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
    // combine the four bytes (two words) into a long integer
    // this is NTP time (seconds since Jan 1 1900):
    unsigned long secsSince1900 = highWord << 16 | lowWord;
    // now convert NTP time into everyday time:
    // Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
    const unsigned long seventyYears = 2208988800UL;
    // subtract seventy years:
    epoch = secsSince1900 - seventyYears;

// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(IPAddress& address)
  // set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12]  = 49;
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;
  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp:
  Udp.beginPacket(address, 123); //NTP requests are to port 123
  Udp.write(packetBuffer, NTP_PACKET_SIZE);


Chris Roberts

Chris Roberts

8 projects • 18 followers
I am an applications engineer with Texas Instruments working with the Launchpad by trade, and a maker by passion!


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