WiFi ThingSpeak Write

Publish data to Internet of Things using ThingSpeak on wireless network

Add-On Required: This feature requires the Simulink Support Package for Arduino Hardware add-on.

• 

Libraries:
Simulink Support Package for Arduino Hardware / WiFi

Description

Use the ThingSpeak Write block to publish input data from your Arduino^® board on a wireless network to Internet of Things (IoT) using ThingSpeak™.

ThingSpeak is an open-source IoT platform with MATLAB^® analytics that allows you to collect and store the sensor data in the cloud and develop IoT applications. The ThingSpeak IoT platform provides applications that allow you to analyze and visualize your data in MATLAB and then act on the data. For more information on how to use ThingSpeak, see ThingSpeak Apps, Plugins, and Tutorials.

Supported Hardware

This table lists the properties of the hardware that the Arduino board supports for the WiFi ThingSpeak Write block.

Target Hardware	Receive Limit (Number of Bytes)
Wi-Fi® Shield	64 bytes
Arduino MKR1000, Arduino MKR Wi-Fi 1010, Arduino Nano 33 IoT, Arduino compatible ESP32 – WROOM, Arduino compatible ESP32 – WROVER	1400 bytes

Note

Using ESP8266 chip for Wi-Fi connectivity does not support deploying WiFi ThingSpeak Write block on an Arduino board.

Ports

Input

fieldn — Data published to nth field of ThingSpeak channel

[1 x N] vector, where N ranges from [1 to 8]

The block publishes the data read to the nth field in the ThingSpeak channel at each time step. The number of data channels at the block input depends on the number of fields that you enter in the Fields to write parameter. For example, if you set the Fields to write parameter to [1 4 5], the block enables three input ports with port names field1, field4, and field5.

Dependencies

• To enable this port, on the Optional tab, select Send location information and set the Location source parameter to Input port.

Data Types: single

location — Send location data

three-element numeric vector

The block sends the location data as a three-element numeric vector of the form [latitude, longitude, altitude].

Dependencies

• To enable this port, on the Optional tab, select Send location information and set the Location source parameter to Input port.

Data Types: single | double

Parameters

Main

Channel ID — ThingSpeak channel ID

12397 (default) | positive integer

Enter the unique identification number of the ThingSpeak channel from which the block reads data.

Follow these steps to find the ThingSpeak channel identification number.

1. Sign in to ThingSpeak using your MATLAB account.

2. Select Channels > My Channels.

3. Select the channel from which to read data.

4. Click the Channel Settings tab and copy the channel ID from the Channel ID parameter.

   

5. Open the ThingSpeak Read block in your model and paste the copied ID to the Channel ID parameter.

Write API key — Write API key of ThingSpeak channel

no default (default) | character vector

Enter the 16-digit write API key of the ThingSpeak channel.

Follow these steps to know the API key for your ThingSpeak channel.

1. Sign in to ThingSpeak using your MATLAB account.

2. Select Channels > My Channels.

3. Select the channel to get the write API key.

4. Click the API Keys tab and copy the key from the Read API Keys parameter.

5. Open the ThingSpeak Read block in your model and paste the copied API key into the Read API key parameter.

Fields to write — Field(s) of ThingSpeak channels to write data

1 (default) | [1 x N] vector, where N ranges from [1 to 8]

Enter the field(s) of the ThingSpeak channel to which the block writes the data. For example, if you set this parameter to [1 2 3], the block writes data to three fields and has three input ports field1, field2, and field3. If you set this parameter to 1, the block writes data to only one field and has one input port field1.

Update interval (seconds) — Data update interval

60 (default) | nonnegative integer

Specify the time interval at which the input data is updated on the ThingSpeak channel.

Print diagnostic messages — Save ThingSpeak server response to log file

off (default) | on

Select this parameter to save the response from the ThingSpeak server to a log file for each write request. The name of the log file has the format <model_name>.log.

Optional

Send location information — Send location information

off (default) | on

Select this parameter to send the location information to the ThingSpeak channel.

Location source — Source of location data

Block dialog (default) | Input port

Select the source of the location data to one of the following:

• Block dialog — Specify the location using the Location (latitude, longitude, altitude) parameter.

• Input port — Specify the location using the location input port.

Use decimal degrees notation to specify latitude and longitude and use meters to specify altitude. For example:

• The lowest human-sized point underground, the TauTona Mine in Carletonville, South Africa, is [-26.416111,27.4275,-3900].

• The highest point measured from sea level, the summit of Mount Everest in Nepal, is [27.988056,86.925278,8848].

Location (latitude, longitude, altitude) — Location information

[42.29971, -71.350719, 69.29] (default) | three-element numeric vector

Enter the location information as a three-element numeric vector of the form [latitude, longitude, altitude] to send location information to the ThingSpeak channel.

Dependencies

• To enable this parameter, set Location source to Block dialog.

Version History

Introduced in R2015b