In this tutorial, we will measure different temperature and humidity data using Temp and humidity sensor. You will also learn how to send this data to ThingSpeak. So that you can create a temp alert in your mail at particular value.
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- Long Range Wireless Mesh Modem with USB Interface
- Arduino IDE
- PubSubClient Library
This library provides a client for doing simple publish/subscribe messaging with a server that supports MQTT
For more information about MQTT, visit mqtt.org.
The latest version of the library can be downloaded from GitHub
The library comes with a number of example sketches. See File > Examples > PubSubClient within the Arduino application.Full API Documentation.
The library uses the Arduino Ethernet Client api for interacting with the underlying network hardware. This means it Just Works with a growing number of boards and shields, including:
- Arduino Ethernet
- Arduino Ethernet Shield
- Arduino YUN – use the included YunClient in place of EthernetClient, and be sure to do a Bridge.begin() first
- Arduino WiFi Shield - if you want to send packets greater than 90 bytes with this shield, enable the MQTT_MAX_TRANSFER_SIZE option in PubSubClient.h.
- Sparkfun WiFly Shield – when used with this library
- Intel Galileo/Edison
- ESP32The library cannot currently be used with hardware based on the ENC28J60 chip – such as the Nanode or the Nuelectronics Ethernet Shield. For those, there is an alternative library available.
The Wire library allows you to communicate with I2C devices, often also called "2 wire" or "TWI" (Two Wire Interface), can download from Wire.h
- Wire.begin()Begin using Wire in master mode, where you will initiate and control data transfers. This is the most common use when interfacing with most I2C peripheral chips.
- Wire.begin(address)Begin using Wire in slave mode, where you will respond at "address" when other I2C masters chips initiate communication.
- Wire.beginTransmission(address)Start a new transmission to a device at "address". Master mode is used.
- Wire.write(data)Send data. In master mode, beginTransmission must be called first.
- Wire.endTransmission()In master mode, this ends the transmission and causes all buffered data to be sent.
- Wire.requestFrom(address, count)Read "count" bytes from a device at "address". Master mode is used.
- Wire.available()Retuns the number of bytes available by calling receive.
- Wire.read()Receive 1 byte.
- Before uploading the code you can view the working of this sensor at a given link.
- Download and include the PubSubClient Library and Wire.h Library.
- You must assign your API key, SSID (WiFi Name) and Password of the available network.
- Compile and upload the Temp-ThinSpeak.ino code.
- To verify the connectivity of the device and the data sent, open the serial monitor.If no response is seen, try unplugging your ESP32 and then plugging it again. Make sure the baud rate of the Serial monitor is set to the same one specified in your code 115200.
- To send data to thingspeak you can view it at this link.
- IFTTT is a web service that lets you create applets that act in response to another action. You can use the IFTTT Webhooks service to create web requests to trigger an action. The incoming action is an HTTP request to the web server, and the outgoing action is an email message.
- First create an IFTTT account.
- Create an applet. Select My Applets.
- Click the New Applet button.
- Select the input action. Click the word this.
- Click the Webhooks service. Enter Webhooks in the search field. Select the Webhooks.
- Choose a trigger.
- Complete the trigger fields. After you select Webhooks as the trigger, click the Receive a web request box to continue. Enter an event name.
- Create trigger.
- Now the trigger is created, for resulting action click That.
- Enter email in the search bar, and select the Email box.
- Now choose action.Select the Send me an email box and then enter the message information.
- Retrieve your Webhooks trigger information. Select My Applets, Services and search for Webhooks. Click Webhooks and Documentation button. You see your key and the format for sending a request. Enter the event name. The event name for this example is Vibration And TempData. You can test the service using the test button or by pasting the URL into your browser.
You can use the result of your analysis to trigger web requests, such as writing a trigger to IFTTT.
- Click Apps, MATLAB Analysis and select New.
- Select Trigger Email from IFTTT in the Examples section. The code below is prepopulated in your MATLAB analysis window.
- Name your analysis and modify the code.
- Save your MATLAB Analysis.
Evaluate your ThingSpeak channel data and trigger other events.
- Click Apps, TimeControl, and then click New TimeControl.
- Save your TimeControl.