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AC Dimmer Module 4A, 1 channel, 3.3V/5V logic, AC 400V-4A

https://www.rbdimmer.com/web/image/product.template/6/image_1920?unique=2320f39
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AC Dimmer module controls AC voltage up to 4A, making it perfect for DIY projects at home or in the garage. It’s ideal for smart home systems—whether you’re dimming lights, running a fan, or powering a pump. Compatible with 5V/3.3V logic, it easily connects to Arduino, ESP32, or similar microcontrollers using the rbdimmerESP32.h lib, ESPHome component, TASMOTA 

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The AC Dimmer is a DIY module—not a finished device—that you integrate into your project by connecting it to your microcontroller. Designed to regulate alternating current (AC) voltage, it safely handles up to 4A. Originally designed for smooth control of lamps and heating elements—not merely simple on/off switching—this versatile module also supports adjustable operation for fans, pumps, air purifiers, and more.

This dimmer is especially useful for smart home projects. With our comprehensive tutorials and user guides, you can build a fully customized solution. For example, you might:

  • Adjust lighting: Gradually turn lights on or off to create a comfortable ambiance.
  • Automate your home: Connect the module to cloud services like HomeAssistant or even control it with voice assistants.
  • Save energy: Program schedules for turning devices on and off, reducing energy consumption.

We provide extensive documentation and instructions not only for Arduino but also for other platforms. You can find guides on using the ESPHome component for integration and automation through HomeAssistant, as well as detailed instructions for connecting and configuring the Tasmota application. These resources ensure that whether you're using Arduino, ESP32, or another platform, you have all the support you need.

The dimmer’s design separates the high-power AC section from the low-power control section to protect your microcontroller. It supports both 5V and 3.3V logic levels, making it a great match for popular platforms such as Arduino and ESP32. The  rbdimmerESP32.h  library simplifies control by managing interrupts and timing, allowing you to focus on expanding your project’s features without complex coding.

Whether you’re creating a simple DIY lighting system or a more advanced smart home setup, our extensive support resources are here to guide you every step of the way.


Technical characteristics:

​Weight: 0.01 kg

​Dimensions: 6 ×2 × 2 cm

​Maximum Voltage: 400V AC

​Maximum Current: 4A

​AC Frequency: 50/60 Hz

​TRIAC: BTA136

​Isolation: Optocoupler

​Logic Levels: 3.3V/5V/12V

​Zero Crossing Detection: Digital logic signal from microcontroller

​Signal Current: >10mA