220V AC Voltage Detection Module with Optocoupler Isolation

This compact 220V AC Voltage Detection Module is engineered for reliable AC mains signal sensing with complete electrical isolation. Whether you're building a PLC control circuit, home automation system, or industrial monitoring setup, this module delivers accurate detection with a safe 3–5V logic-level output — making it compatible with Arduino, Raspberry Pi, STM32, and virtually any microcontroller or PLC input card.

The onboard optocoupler isolation keeps your low-voltage control circuitry completely separated from the 220V AC mains, protecting your electronics and improving overall system safety. The SMD-based design keeps the footprint minimal at just 72mm × 15mm, making it easy to integrate into tight enclosures and control panels.

Key Features

Input Voltage: 220V AC mains
Output Voltage: 3–5V DC (logic-level compatible)
Isolation: Optocoupler-based galvanic isolation for safe operation
Form Factor: Compact SMD design — 72mm × 15mm
Compatible With: PLC, Arduino, Raspberry Pi, STM32, and other microcontrollers
Customizable Quantity: Available in 1pc, 5pcs, or 10pcs per order
Application: AC presence detection, zero-crossing detection, mains monitoring, automation systems

What's Included

220V AC Voltage Detection Module (SMD) — your choice of 1pc, 5pcs, or 10pcs

Perfect For

PLC input signal conditioning
Home and industrial automation projects
AC mains presence detection circuits
DIY electronics and maker projects
Control panel and switchboard integration

Frequently Asked Questions

Q: What does the 220V AC Voltage Detection Module with Optocoupler Isolation do?

A: This module detects the presence of 220V AC mains voltage and outputs a corresponding 3–5V DC logic signal. The built-in optocoupler provides galvanic isolation between the high-voltage AC side and your low-voltage control circuitry, making it ideal for safely interfacing mains power with PLCs, microcontrollers, and automation systems.

Q: Is this module compatible with Arduino and Raspberry Pi?

A: Yes. Because the output is a standard 3–5V logic-level signal, this module is fully compatible with Arduino, Raspberry Pi, STM32, ESP32, and most common PLC input cards. Simply connect the output to a digital input pin on your controller to detect AC mains presence.

Q: How many modules can I order at once, and what size are they?

A: You can order 1pc, 5pcs, or 10pcs per order depending on your project needs. Each module measures 72mm × 15mm, featuring a compact SMD design that fits easily into control panels and electronics enclosures.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.