4.70 out of 5 based on 89 customer ratings
(89 customer reviews )

AC power Dimmer module 8A-400V

3.59$

The AC Dimmer controls AC voltage 8A for devices like lamps, fans, and pumps. It’s ideal for smart home systems and works best with filament and high-brightness LEDs. Compatible with 5V/3.3V logic, it connects to Arduino and uses the RBDDimmer.h library for easy control.

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The AC Dimmer is designed to regulate alternating current (AC) voltage, capable of handling currents from 8A. However, we do not recommend pushing the power to the upper limit. Typically, dimmers are used to switch lamps or heating elements on and off but are also suitable for controlling fans, pumps, air purifiers, and similar devices.

Recently, dimmers have become popular in smart home systems, such as for smoothly adjusting light brightness. For example, a light can gradually turn on or off, creating a comfortable ambiance. Dimmers work best with filament lamps, while performance with low-brightness LED lamps may be inconsistent. However, they function well with medium and high-brightness LEDs. Note that fluorescent (gas discharge) lamps do not support dimming.

The power section of the dimmer is isolated from the control section to prevent high currents from interfering with the microcontroller. It is compatible with both 5V and 3.3V logic levels, making it easy to connect to microcontrollers using either.

For Arduino projects, the dimmer is controlled via the RBDDimmer.h library, which handles external and process time interrupts. This simplifies coding and frees up processing time for other tasks, allowing multiple dimmers to be controlled by a single microcontroller. You can download the RBDDimmer.h library and example codes from the “Documents” section or GitHub. Our library is regularly updated, so we recommend checking for updates on our website or subscribing to our newsletter.

The dimmer connects to Arduino controllers via two digital pins. The first pin (Zero) controls the Phase Null detection of the AC, triggering interrupt signals. The second pin (DIM/PSM) adjusts the current. Note that the Zero pin must be connected to specific microcontroller pins (which vary depending on the model, such as Uno, Nano, Leonardo, or Mega) because it’s tied to the microcontroller’s interrupt function.

Technical characteristics

Weight 0.019 kg
Dimensions 8 × 4 × 4 cm
V max

400V

A max

8A

AC frequency

50/60 Hz

TRIAC

BTA16-600B

Isolation

Optocoupler

Logic level

3.3V/5V/12V

Zero point

Logic level

Modulation (DIM/PWM)

Logic level ON/OFF TRIAC

Signal current

>10mA

FrameWorks

  • Connection instruction and library
  • Example: Dimming value through the serial port
  • Example: Power ON/OFF
  • Example: Dimming with a potentiometer
  • Example: Toggle Dimming values
  • Example: Smoothly Dimming with buttons action
  • Two or more dimmers connection
  • YAML configuration entry
  • Connection GPIO details
  • Examples

Dimmers projects

Dimmer with ESP32 – Blynk IoT Platform. Arduino code, settings, Web and mobile APP.

Blynk IoT  is a full suite of software required to prototype, deploy, and remotely manage connected electronic devices at any scale: from personal IoT projects to millions of commercially connected products. With Blynk anyone can connect their hardware to the cloud and build a no-code iOS, Android, and web applications to analyze real-time and historical…
Read More Dimmer with ESP32 – Blynk IoT Platform. Arduino code, settings, Web and mobile APP.

Dimmer with ESP32 – ESP RainMaker Cloud platform + Mobile APP.

ESP RainMaker® is a complete system for building AIoT products with a minimal amount of code, empowering your team to develop and deploy secure, customized AIoT solutions. It covers all Espressif chips and modules, device firmware, voice-assistant integrations, phone apps and cloud backend. This helps you save a large investment in cloud, gain independence and focus…
Read More Dimmer with ESP32 – ESP RainMaker Cloud platform + Mobile APP.

Dimmer with ESP8266/ESP32 MQTT – Publish and Subscribe with Arduino IDE. Connecting to Home Assistant, Node-RED, Amazon AWS, and openHAB

This project shows how to use MQTT communication protocol with the ESP32 to publish messages and subscribe to topics from MQTT broker under servers like Home Assistant, Node RED, Amazon AWS, and openHAB. As an example, we’ll control the dimmer. The server can be either local or on the cloud. The ESP32 we’ll be programmed…
Read More Dimmer with ESP8266/ESP32 MQTT – Publish and Subscribe with Arduino IDE. Connecting to Home Assistant, Node-RED, Amazon AWS, and openHAB

Dimmers Q&A

How to choose AC dimmer module?

The main parameter is current power (Ampere/Watt). We recommend that the device load power value be no over than 70% of the dimmer value. Example: Dimmer 8A (230V*8A=1.8kWt), load = 8A*70%=5.6A (230V*5.6A=1.3kWt).

89 reviews for AC power Dimmer module 8A-400V

  1. Reviewer profile image
    5 out of 5

    N***s

    Works as expected! Thank you!

  2. Reviewer profile image
    5 out of 5

    Z***c

  3. Reviewer profile image
    1 out of 5

    c***n

    The product does not match the photo. The Neutre connector has disappeared and a red wheel wire of poor quality has been replaced. I am not satisfied at all.

  4. Reviewer profile image
    5 out of 5

    S***s

    All recieved in good condition, thank you!

  5. Reviewer profile image
    5 out of 5

    t***a

  6. Reviewer profile image
    5 out of 5

    B***n

    Not yet used, radiator seems undersized for use without the risk of overheating

  7. Reviewer profile image
    5 out of 5

    A***e

  8. Reviewer profile image
    5 out of 5

    Google Shopper

    Good quality. library for Arduino – rbdimmer.com

  9. Reviewer profile image
    5 out of 5

    e***e

    Good product, works well for now

  10. Reviewer profile image
    1 out of 5

    J***R

    Hello,
    Fast delivery.
    Unfortunately, none of the 2 Dadders work.
    However, I respected all the prescriptions and used the manufacturer’s software.
    What to do?
    Thank you for your answer.
    J.Ch.Chevrier

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