PC817 3.6V-30V Optocoupler Isolation Board Voltage Converter Module (2-Channel & 4-Channel)

These 2-channel and 4-channel PC817 optocoupler isolation modules are used to convert input signals from one voltage level to an output of another voltage level.

The modules will operate with input voltages in the range of 3.6V to 24V, and output voltages in the range of 3.6V to 30V, accommodating a wide range of voltages and applications. For example, you can monitor a 24V industrial or security sensor with a 5V (Arduino) or 3.3V-compatible device (ESP32, Raspberry Pi GPIO). It is ideal for use in noisy circuits where signal lines require electrical isolation.

Each channel is fully isolated from the others, so each module can handle two or four different input voltage signals and two or four different output voltage signals. The conversion for each channel is performed by a PC817 optocoupler.

Each channel includes a jumper. If the jumper is installed, the ground (GND) connections of the input and output signals are connected. If the jumper is not connected, the two pins are separate. If you need fully isolated input and output signals, remove the jumper. The board has an LED for each channel. If the LED is on, the input signal is on.

If the input signal is off, the output signal is high. When the input signal turns on, triggering the optocoupler, the output signal goes low.

The schematic below shows one of the optocoupler channels. Each board has two or four of these channels, depending on the board type.

Warning: Optocouplers have a low output current. For example, the maximum output current for PC817 is 50 mA. You cannot connect high-current components (such as motors, etc.) to the optocoupler output directly. You must use a transistor to supply current in such cases.

PC-817 Optocoupler Module Features & Specifications

• Input voltage 3.6V to 24V
• Output voltage 3.6V to 30V
• Maximum Output (Emitter) Current: 50mA *
• Maximum Frequency: 4KHz
• Rise and Fall Times: 18us
• Input Pins:
  • IN1 … IN4: +3.6V to 30 V
  • G: Ground
• Output Pins:
  • V1 … V4: Phototransistor collector pins
  • G: Phototransistor emitter pins

PC-817 Optocoupler Module Tutorials and References

Using the PC817 module as an Arduino digital input board by Michael Schoeffler: https://mschoeffler.com/2021/04/30/arduino-tutorial-hy-m154-817-pc817-optocoupler-module/

Using the PC817 module as an Arduino digital output board by cmheong: https://cmheong.blogspot.com/2020/06/more-power-hy-m154-4-channel.html

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