Lazar Trifunovic, Hung Pham, William Schundlemire

Published April 12, 2017 © GPL3+

Remote Temperature Sensing

A simple project for remote temperature sensing of any environment. Provides live temperature readings to your phone and over the internet.

BeginnerFull instructions provided2 hours1,246

Things used in this project

Hardware components

Particle Photon

Since we had three remote temperature monitoring setups, we have three times as many materials.

Temperature Sensor

We used the DS18B20 uncovered and covered temperature sensors to make this project.

Resistor 1k ohm

4.7K ohm resistors are an option as well, we just noticed more issues with receiving proper temperature measurements when using them.

Jumper wires (generic)

Software apps and online services

Ubidots

Story

We all spend a lot of time together at our apartment which happens to be three stories tall. Out of curiosity, we looked to develop temperature monitors that we could place within the three bedrooms which are spread over the first, second, and third floor level. We wondered if the room on the third floor would be measurably warmer than the other two since heat rises. This Hackster.io project summarizes the work we completed to create the three temperature sensors.

Youtube Overview of Project

Setting up the Circuit

The center leg is the data output. This will connect to D2. Pin D2, as well as the positive leg of the temperature sensor, will be connected to 3v3, however for the D2 connection you may use a 4.7k or 1k ohm resistor.

Setting up Ubidots

Log in to Ubidots and create a data source. Then add a new variable. This variable will be a measurement of your temperature.Please copy your Variable ID as that will be used in your code. This can be found under the info button of your variable as shown below.

Now, under your My Profile tab, create a token and record the token ID.

Coding the Particle

Now, navigate to build.particle.io , and create a new app. Our next step is to include the necessary libraries for the project. We'll walk you through how to import the HTTPCLIENT Library, then you must import the OneWire and Spark Dallas Temperature Library.

Click on the libraries icon and search for "HTTPCLIENT". Click on the HTTPCLIENT library and then click the include in app button.

Repeat the same steps with the OneWire and Spark Dallas Temperature library. If the Spark Dallas Temperature library is giving you issues follow our fix listed in the code section.

Now copy the code below over into build.particle.io .Remember that the code has two defined constants: TOKEN and VARIABLE_ID. Replace their values with the ones noted above.

Flash the code to the particle and you should now be able to see the temperature data in Ubidots!

Example Data (3 graphs for the 3 different sensors)

DS18B20 Temperature Sensor to Ubidots code

DS18B20 Temperature Sensor to Ubidots code

C/C++

This is a basic code using the Particle.io build app. We include the HTTPClient, OneWire and Spark-dallas-temperature libraries to read our DS18B20 temperature sensor. In order to get data to Ubidots, you need to find and include the VARIABLE_ID and TOKEN and insert into the code on lines 19 and 20 respectively. The only problem we ran into was that the spark-dallas-temperature library included in particle build was not updated. Line 27 in the spark-dallas-temperature.h file was changed to #include <OneWire.h> and added next to our original code.

// This #include statement was automatically added by the Particle IDE.
#include "spark-dallas-temperature.h"

// This #include statement was automatically added by the Spark IDE.
#include "HttpClient/HttpClient.h"
 
// This #include statement was automatically added by the Spark IDE.
#include "OneWire.h"
 
 
#define ONE_WIRE_BUS D2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensor(&oneWire);
float temperaturef = 0.0; 
float temperature = 0.0;
char resultstr[64];
HttpClient http;
 
#define VARIABLE_ID "58ecf2787625422c3a418de6"
#define TOKEN "TASZcmIv4eg1oS180p4kKHs31Zy81q"
 
http_header_t headers[] = {
      { "Content-Type", "application/json" },
      { "X-Auth-Token" , TOKEN },
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};
 
http_request_t request;
http_response_t response;
 
void setup() {
    request.port = 80;
    request.hostname = "things.ubidots.com";
    request.path = "/api/v1.6/variables/"VARIABLE_ID"/values";
    Serial.begin(9600);
    sensor.begin();
}
 
void loop() {
 sensor.requestTemperatures();
 temperature=sensor.getTempCByIndex( 0 );
 temperaturef=((1.81*temperature)+32);
 sprintf(resultstr, "{\"value\":%.4f}",temperaturef); 
 request.body = resultstr;//Sending presence to Ubidots
 http.post(request, response, headers);
 Serial.println(response.status); //For debug only
 Serial.println(response.body);
 delay(1000);
}

Remote Temperature Sensing

Things used in this project

Hardware components

Software apps and online services

Story

Code

DS18B20 Temperature Sensor to Ubidots code

Credits

Lazar Trifunovic

Hung Pham

William Schundlemire

Comments

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Remote Temperature Sensing

Remote Temperature Sensing

Things used in this project

Hardware components

Software apps and online services

Story

Code

DS18B20 Temperature Sensor to Ubidots code

Credits

Lazar Trifunovic

Hung Pham

William Schundlemire

Comments

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