PC817 2 Channel Optocoupler Isolation Module 3.6–30V Level Converter - Image 1
PC817 2 Channel Optocoupler Isolation Module 3.6–30V Level Converter - Image 2
PC817 2 Channel Optocoupler Isolation Module 3.6–30V Level Converter - Image 3
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PC817 2 Channel Optocoupler Isolation Module 3.6–30V Level Converter - Image 5
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PC817 2 Channel Optocoupler Isolation Module 3.6–30V Level Converter

PC817 8 Channel Optocoupler Isolation Module 3.3–30V Signal Converter
AC 220V Optocoupler Isolation Module 1 Channel TTL Output PLC Arduino
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Description

🔌 PC817 2-Channel Optocoupler Isolation Module – 3.6–30V Signal Isolation Board | AuscomTech

The PC817 2-Channel Optocoupler Isolation Board is designed to provide safe, reliable electrical isolation between low-voltage control logic and higher-voltage circuits. Using PC817 photoelectric optocouplers, this module protects sensitive microcontrollers from voltage spikes, noise, and ground loops while enabling clean signal transfer.

It is ideal for Arduino, ESP32, Raspberry Pi, PLCs, and industrial control systems, allowing 3.3V or 5V logic signals to interface safely with 3.6–30V control circuits.

⭐ Key Features

🔒 Photoelectric Isolation (PC817)
Provides galvanic isolation between input and output, protecting MCUs from high-voltage interference.

🔁 2 Independent Channels
Two fully isolated signal channels allow simultaneous control or sensing.

⚡ Wide Voltage Compatibility
Supports control signals from 3.6V to 30V, ideal for 12V and 24V systems.

🧠 Logic-Level Friendly
Compatible with 3.3V and 5V logic from Arduino, ESP32, STM32, Raspberry Pi, and PLCs.

🔧 Configurable Output Logic
Jumper-selectable high-level or low-level output, adapting easily to different control requirements.

📉 Noise & Ground Loop Protection
Excellent for noisy environments, long cable runs, and mixed-voltage systems.

📊 Technical Specifications

Specification Details
Optocoupler PC817
Channels 2
Input Signal Voltage 3.6V – 24V
Output Voltage Range 3.6V – 30V
Max Output Current 10mA
Signal Frequency ≤ 4kHz
Output Logic High / Low (jumper selectable)
Isolation Method Photoelectric
Dimensions 37 × 30 × 10 mm

⚠️ Note: Voltage and output current are inversely proportional. Not suitable for high-speed pulse signals above 4kHz due to PC817 switching limitations.

🧩 Compatible With

• Arduino (Uno, Mega, Nano)
• ESP32 / ESP8266
• Raspberry Pi (GPIO isolation)
• STM32 microcontrollers
• PLC digital inputs
• Relay & MOSFET driver circuits

⚙️ Typical Applications

• MCU to high-voltage signal isolation
• 3.3V / 5V to 12V / 24V level shifting
• Relay, MOSFET, and transistor driving
• Industrial sensor & actuator interfacing
• Noise suppression and EMI protection
• Ground loop isolation
• Automation and control systems

📦 Package Includes

• 1 × PC817 2-Channel Optocoupler Isolation Module

📌 Code Examples & Usage – PC817 2-Channel Optocoupler Isolation Board

📋 What This Module Is For

The PC817 optocoupler isolation board uses two PC817 optocouplers to provide electrical isolation between:

👉 A noisy, high-voltage, or untrusted circuit
and
👉 A sensitive microcontroller (Arduino / ESP32 / Raspberry Pi)

It’s ideal for:

✔ Protecting MCU GPIOs from voltage spikes
✔ Reading high-voltage signals (e.g., mains, 12 V logic)
✔ Isolating relay triggers or motor drivers
✔ Reducing noise and ground loops

🔌 How It Works

Each channel uses an LED + phototransistor inside the PC817:

  • Input side (LED): Driven by the signal you want to monitor

  • Output side (phototransistor): Provides a clean digital signal to your MCU

Because the LED and transistor are optically coupled, there’s no direct electrical connection — giving true galvanic isolation.

📌 Wiring (Typical)

Isolated Input Side

Module Input Connect To
IN1 / IN2 Signal to be monitored (e.g., from 5 V / 12 V / mains interface)
GND (Input) Signal ground or reference
VCC (Input) Suitable LED drive voltage (depends on your input — usually 5 V)

Output Side (MCU Side)

Module Output Connect To
OUT1 / OUT2 Arduino / ESP32 digital pin (e.g., D2)
GND (Output) MCU ground
VCC (Output) MCU logic voltage (3.3 V or 5 V)

🔌 The Input side and Output side grounds are not connected — that’s the whole point of isolation.

🧪 Arduino Example — Reading an Isolated Digital Signal

This example assumes:

  • IN1 receives a digital signal (e.g., 5 V logic)

  • OUT1 goes to Arduino D2

  • Output logic is pulled up to Arduino 5 V

const int optoPin = 2;

void setup() {
pinMode(optoPin, INPUT_PULLUP); // use pull-up if needed
Serial.begin(9600);
}

void loop() {
int state = digitalRead(optoPin);
Serial.print(“Isolated signal: “);
Serial.println(state == LOW ? “ACTIVE” : “INACTIVE”);
delay(200);
}

Note: The PC817 output transistor typically pulls the output LOW when active. If your wiring differs, invert the logic accordingly.

⚡ ESP32 Example — Safe Isolation Reading

This example assumes the output side is pulled up to 3.3 V for ESP32 logic.

const int optoPin = 15;

void setup() {
pinMode(optoPin, INPUT_PULLUP);
Serial.begin(115200);
}

void loop() {
int state = digitalRead(optoPin);
Serial.print(“Isolated input state: “);
Serial.println(state == LOW ? “TRIGGERED” : “IDLE”);
delay(200);
}

🧠 Typical Use Cases

🔹 High-Voltage Safeguard

Use the input side to monitor a high-voltage logic line (e.g., 12 V from a relay board), and let the optocoupler protect your low-voltage microcontroller.

🔹 Motor Driver Isolation

Read a tachometer or limit switch on a noisy motor driver without picking up spikes.

📊 Pull-Up Considerations

Optocouplers output via a transistor — they sink current, but do not source it.

So typically you will:

✔ Use INPUT_PULLUP on the MCU pin
✔ Or add an external pull-up resistor (10 kΩ) to 3.3 V / 5 V

🔌 Example: Isolated Button Input

This lets you keep a noisy button/switch isolated from your MCU:

[Switch] → [Optocoupler LED] → GND
|
Input side VIN 5–12 V
|
[PC817 LED]
|
GND
MCU reads transistor output via pull-up

🧠 Notes & Tips

✔ Remember: Two isolated grounds — don’t connect them directly
✔ Input LED current for the PC817 should be limited (e.g., via resistor)
✔ Typical CTR (current transfer ratio) means low input LED current gives detectable output
✔ The PC817 handles up to 30 V on the isolated input safely (as long as currents are controlled)

Additional information

Weight 40 g
Dimensions 260 × 160 × 20 mm

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