Blog Posts | RBDIMMER

13 Articles

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Multi-Channel AC Dimmer Control: 2CH and 4CH Guide

Feb 26, 2026

0 3002

FAQ

TL;DR: 2CH 8A and 4CH 10A modules share one ZC pin across all channels. Each channel has its own DIM pin. One interrupt call in code covers all channels; brightness is set independently per channel ha...

ac-dimmer Arduino ESP32 ESP8266 multi-channel RBDdimmer tutorial

Which AC Dimmer Module to Choose: Complete Buyer's Guide

Feb 26, 2026

0 5756

FAQ

TL;DR: Three questions determine your choice: (1) load type — resistive (heater, incandescent) or inductive (motor); (2) load power in watts → calculate amps → pick a rating with a ×1.3 safety margin;...

ac-dimmer Arduino buyer-guide dimmerlink ESP32 TRIAC tutorial

Zero-Cross Not Detected: AC Dimmer Doesn't Respond to Commands

Feb 26, 2026

0 2842

FAQ

TL;DR: An AC dimmer can't regulate the load if the microcontroller isn't receiving the zero-cross signal (the sine wave crossing zero). Without this signal it's impossible to calculate the TRIAC firin...

ac-dimmer Arduino ESP32 troubleshooting zero-cross

Wrong Library: RBDdimmer Instead of rbdimmerESP32 on ESP32

Feb 26, 2026

0 2621

FAQ

TL;DR: For ESP32 you need rbdimmerESP32 — not the old RBDdimmer . The old library was written for Arduino AVR: no IRAM_ATTR , no core pinning, no race condition protection. On ESP32 it causes Guru Med...

ac-dimmer Arduino ESP32 troubleshooting

TRIAC Overheating: AC Dimmer Runs Hot or Burns Out

Feb 26, 2026

0 3541

FAQ

TL;DR: A TRIAC is an active device with a voltage drop of ~1.2V. At load currents above 2A it dissipates several watts as heat. Without thermal management: overheating, thermal protection triggering, ...

ac-dimmer Arduino TRIAC troubleshooting

AC TRIAC Dimmer Is Not PWM: How Phase-Cut Dimming Works

Feb 26, 2026

0 3107

FAQ

TL;DR: analogWrite() and PWM don't work with an AC TRIAC dimmer. A TRIAC is not a resistor or a DC transistor. It regulates power using phase-cut control : it opens at a precisely calculated moment ea...

ac-dimmer Arduino ESP32 TRIAC troubleshooting

LED Lamps with AC Dimmer: TRIAC or MOSFET — Compatibility Guide

Feb 26, 2026

0 3471

FAQ

Short answer: There are two types of AC dimmers: TRIAC (leading edge — for incandescent bulbs, halogen, heaters) and MOSFET AC dimmer (trailing edge — purpose-built for LED lamps). If an LED lamp flic...

ac-dimmer Arduino LED MOSFET trailing-edge TRIAC tutorial

Trailing Edge vs Leading Edge: Which Dimmer Method to Choose

Feb 26, 2026

0 5976

FAQ

Short answer: Leading edge is the standard TRIAC dimmer — it opens the load in the second half of each AC half-cycle (best for incandescent bulbs and heaters). Trailing edge is a MOSFET dimmer — it op...

ac-dimmer Arduino leading-edge LED MOSFET trailing-edge TRIAC tutorial

LED Flickering with AC Dimmer: TRIAC or MOSFET — Causes and Fixes

Feb 26, 2026

0 3619

FAQ

Short answer: LED flickering with an AC dimmer has three distinct root causes. Types 1 and 2 are caused by TRIAC architectural incompatibility with LED lamps — the hardware fix is a MOSFET AC dimmer (...

ac-dimmer Arduino ESP32 flicker LED MOSFET TRIAC tutorial

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

Mar 28, 2025

0 10107

Integration Guides

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 pro...

ac-dimmer Arduino Blynk ESP32 tutorial

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

Mar 28, 2025

0 11455

Integration Guides

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 chip...

ac-dimmer Arduino ESP32 RainMaker tutorial

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

Mar 28, 2025

0 9311

Integration Guides

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 openH...

ac-dimmer Arduino ESP32 home-assistant MQTT tutorial

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