IoT Node


You'll need to install a library to make Arduino IDE support the module. This library includes drivers for the LTV-827S and sample code for you to jumpstart your project.


For ESP32 based systems, we're currently supporting Arduino core. Please make sure you've installed the following:

  • Arduino IDE.

  • ESP32 Hardware libraries for the Arduino IDE.

  • Python for the compilation of Arduino projects.

  • Drivers for your host device, e.g., USB Virtual Serial Port driver.


Please download the library archive from

Then, copy its contents to your Arduino Libraries folder.

You can find the Arduino Libraries folder inside your Arduino sketch directory. It is generally located inside the My Documents folder.


The library comes with included samples. There is no need to download additional files for the examples.

Source Code

The hardware, its drivers and the sample code are open source. You can use them under the terms of the MIT license. Please feel free to customize and prototype them for your projects.

Arduino Library

Turta_Photocoupler_Module library is responsible for reading the photocoupler inputs.

To use the library on Arduino IDE, add the following #include statement to the top of your sketch.

#include <Turta_Photocoupler_Module.h>

Then, create an instance of the Turta_Photocoupler_Module class.

Turta_Photocoupler_Module pc

Now you're ready to access the library by calling the pc instance.


To initialize the module, call the begin method.


This method configures the interrupt pins to read input state.

Basic Members

Read Input

Returns the state of the photocoupler inputs.

bool readInput(uint8_t ch)
  • Parameters

    • uint8_t: ch - Input channel, 1 or 2.

  • Returns

    • Bool: Input state


You can open the example from Arduino IDE > File > Examples > Examples from Custom Libraries > Turta Photocoupler Module. There is one example of this sensor.

pagePhotocoupler Sample


If you're experiencing difficulties while working with your device, please try the following steps.

Problem: You connected a button to the photocoupler, but it does not read any input. Cause: The photocoupler module needs external 24V to be activated. Solution: Please consider using 24V power supply in your circuit.

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