TLP281 4-Channel Opto-isolator IC Module Features
Sometimes we need to separate the low-voltage section (microcontroller) from the high-voltage one in circuit in order to prevent noise and damage to the microcontroller. This module isolates the low-voltage section from the high-voltage section using TLP281-4 IC. This IC contains 4 LEDs (Light Emitting Diode). 4 high-voltage channels can be controlled by microcontroller using this IC.
This module can also be used to turn on and off the servo motor and other types of motors.
This module has 4 input and 4 output pins. For example, if you turn on input pin 1, the output base voltage will place on pin 1 of output. The output base voltage must be less than 24 volts.
You can download the datasheet of this module here.
TLP281 4-Channel Opto-isolator IC Module Pinout
This Module has 12 pins:
- HVCC: Output base voltage – (Max 24V)
- HGND: Output Ground
- GND: Input Ground
- IN1: Digital input 1
- IN2: Digital input 2
- IN3: Digital input 3
- IN4: Digital input 4
- OUT1: Output 1
- OUT2: Output 2
- OUT3: Output 3
- OUT4: Output 4
- NC: Not used pin
You can see the pinout of this module in the image below.
Interfacing TLP281 4-Channel Opto-isolator IC Module with Arduino
Step 1: Circuit
The following circuit shows how you should connect Arduino to TLP281 module. Connect wires accordingly.
Do not connect the ground of low-voltage section to the ground of high-voltage section
Step 2: Code
Upload the following code to your Arduino.
/* TLP281-4Channel-Optocoupler made on 02 Nov 2020 by Amir Mohammad Shojaee @ Electropeak
We have connected pin 5 to input 1. If you turn on this pin, the output base voltage will place on the output pin 1.
We measure the output voltage of pin 1 with a multimeter. The voltage is shown in the image below.