Blog Posts | RBDIMMER

27 Articles

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Wrong Library: RBDdimmer Instead of rbdimmerESP32 on ESP32

Feb 26, 2026

0 1567

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 1930

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

ESP32-S2/C3/H2: AC Dimmer Doesn't Work on Single-Core ESP32

Feb 26, 2026

0 1460

FAQ

TL;DR: rbdimmerESP32 is designed for dual-core ESP32 (original and S3). ESP32-S2, C3, C6, and H2 are single-core. The library tries to isolate the dimmer task on a dedicated core — which is impossible...

ac-dimmer dimmerlink ESP32 troubleshooting

ESP32 + AC Dimmer: Guru Meditation Error and IRAM_ATTR — Causes and Fix

Feb 26, 2026

0 1367

FAQ

TL;DR: If your ESP32 with an AC dimmer crashes ("Guru Meditation Error" or "Cache disabled but cached memory region accessed"), the cause is that the zero-cross ISR handler is not marked with IRAM_ATT...

ac-dimmer ESP32 IRAM_ATTR troubleshooting WiFi

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

Feb 26, 2026

0 1324

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 1565

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 2139

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 1737

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

How to Fix ESP32 AC Dimmer Flickering. Guide

Feb 10, 2026

0 2587

Tech Articles

If you are building an AC dimmer with a TRIAC, you have probably noticed flickering, unstable brightness, or random jumps in light intensity. Most DIY developers think the problem is caused by: low-qu...

ac-dimmer dimmerlink ESP32 tutorial

Announcing: Universal AC Dimmer Library for ESP32. Initial Release

Apr 22, 2025

0 5742

News

We're excited to announce the initial release of rbdimmerESP32, an open-source library that makes AC dimming control simple and reliable for your ESP32 projects. Whether you're building smart home lig...

ac-dimmer news

AC Dimmer Based on Zero-Cross Detector and TRIAC: Operating Principles and Applications

Apr 10, 2025

3 11418

Tech Articles

Introduction Dimming is the process of regulating the power of an electrical device: controlling the power of different types of water or air heaters, light brightness, or the rotation speed of fans, ...

ac-dimmer theory

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

Mar 28, 2025

0 8589

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

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