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ThingSpeak Input

Read input fields from ThingSpeak channel

  • Library:
  • Simulink Desktop Real-Time / Internet of Things

  • ThingSpeak Input block


The ThingSpeak Input block reads numeric data from ThingSpeak™ channels.

By default, this block uses the public ThingSpeak server, To configure the ThingSpeak channel, click Configure channel parameters.

To access the web page for Channel number, click View channel web page.

This block does not synchronize the ThingSpeak timestamp with the simulation time. For example, assume that the block is set to a sample time of 0.1 s and that the channel update period is 20 s. The sensor acquires new data at time T and transmits it to the ThingSpeak server, which gives the data a timestamp. If new data arrives before the 20 s update period has passed, the new data is lost. The block runs every 0.1 s and gets new data only every 20 s. The rest of the time, the block gets old data.



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Scalar numeric data read from the ThingSpeak channel.

Example: 3.14159


The setting of the Output data type parameter determines the port data type.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32


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This property is read-only.

To select a channel, click the Configure channel parameters button. In the Network Services ThingSpeak dialog box, set the Channel ID parameter.

To configure the channel, click this button. A dialog box displays the channel parameter settings.

To accept your changes, click OK. To test your changes, click Test. To revert your settings to their previous values, click Revert. To exit the dialog box without changing the settings, click Cancel.

The default value is the standard address of the public ThingSpeak server.

Select a unique channel among the available channels.

You cannot read and write over the same ThingSpeak channel in the same model.

By default, this key is the API key for the channel on the public server,

Time between successive reads over the channel.

To access the web page for Channel number, click View channel web page.

Enter a value, in seconds, that represents how frequently you want the block to execute and interact with the I/O hardware. The block synchronizes your model with the real-time clock at this sample rate.

If you are using a fixed-step solver, enter the value that you entered as the Fixed step size configuration parameter or an integer multiple of that value.

In normal or accelerator modes, enter the number of timer ticks that your model can lag behind the real-time kernel. When the model lags behind by this number or fewer timer ticks, the software assumes that the lag is temporary. It allows the model to catch up, even if the model misses some ticks. When the model lags by more than this number, the software reports an error and simulation stops.

In external mode, the software ignores this value.

In normal or accelerator modes, select this check box to send the number of missed ticks to output port Missed Ticks.

In external mode, the Missed Ticks port is zero.

In normal or accelerator modes, select this check box to grant other programs more CPU time while the kernel waits for a response from the hardware.

In external mode, the software ignores this value.

You can read 1–8 fields from each channel. Use this parameter to ignore implementation-specific information and receive only the fields that your application requires.

Define the data type of the output port.

To open the Data Type Assistant, click the >> button. To close the Data Type Assistant, click the << button.

Use a built-in type, such as double or one defined by a data type expression.

Set of built-in types that are available for constructing data type expressions.

  • inherit — Port inherits type of signal that it is connected to.

  • off — Port sets signal data type to the type defined by this block.

Introduced in R2017b