FAQ | RBDIMMER

20 Articles

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DimmerLink Not Detected on I2C: UART Mode Default Issue

Feb 26, 2026

0 30

TL;DR: DimmerLink ships from the factory in UART mode . i2cdetect will not show address 0x50 until you send the SWITCH_I2C command ( 02 5B ) over UART at 115200 baud. Also add 4.7 kΩ pull-up resistors...

I2C ac-dimmer dimmerlink troubleshooting

AC Dimmer Flickering at Low Brightness Levels

Feb 26, 2026

0 18

TL;DR: Irregular flicker at 5–25% brightness (stable at 50%+) is caused by ZC signal jitter, ISR delays from WiFi on ESP32/ESP8266, or TRIAC holding-current misses. Fix: set a minimum stable level (10...

ESP32 ac-dimmer halogen incandescent troubleshooting tutorial

AC Dimmer Doesn't Turn Off: Residual Glow at 0%

Feb 26, 2026

0 29

TL;DR: Setting the dimmer to 0% does not guarantee the lamp turns off. TRIAC holding current keeps the switch conducting at low loads. Fix: call dimmer.setState(OFF) or setMode(OFF_MODE) instead of se...

TRIAC ac-dimmer halogen incandescent troubleshooting tutorial

Tasmota AC Dimmer Control via DimmerLink

Feb 26, 2026

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TL;DR: Tasmota cannot drive a phase-cut TRIAC dimmer natively. Use DimmerLink as an I2C/UART slave. On ESP32 Tasmota: write a 5-line Berry script that maps any rule trigger to an I2C register write at...

ESP8266 ac-dimmer berry dimmerlink smart-home tasmota tutorial

Raspberry Pi AC Dimmer Control via DimmerLink

Feb 26, 2026

0 15

TL;DR: Direct TRIAC phase-cut from Raspberry Pi GPIO is not feasible — Linux OS jitter is 1–10 ms while TRIAC timing requires < 100 µs. Use DimmerLink as a hardware controller: RPi writes a brightness...

ac-dimmer dimmerlink linux python raspberry-pi tutorial

AC Dimmer Safety: Mains Voltage, Isolation, and Wiring

Feb 26, 2026

0 22

FAQ

TL;DR: AC dimmer modules use optical isolation — the MCU-side pins (ZC, DIM, VCC, GND) are electrically separated from 230V mains. The AC terminals (AC-IN, AC-N, AC-OUT) are live mains voltage. Size w...

ac-dimmer safety theory tutorial

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

Feb 26, 2026

0 23

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...

Arduino ESP32 ESP8266 RBDdimmer ac-dimmer multi-channel tutorial

AC Dimmer via MQTT with ESP32 and ESP8266

Feb 26, 2026

0 42

TL;DR: Install rbdimmerESP32 (for ESP32) or RBDdimmer (for ESP8266) plus PubSubClient . Connect to your MQTT broker, subscribe to a brightness topic, and call rbdimmer_set_level() in the callback. Pub...

ESP32 MQTT ac-dimmer home-automation tutorial

AC Dimmer with Home Assistant: ESPHome and DimmerLink Guide

Feb 26, 2026

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TL;DR: Two integration paths exist. Path A (standard ESPHome ac_dimmer platform) is simple but causes ISR/WiFi conflicts on dual-core ESP32. Path B (DimmerLink ESPHome component) offloads TRIAC timing...

ESP32 ac-dimmer dimmerlink home-automation tutorial

ESPHome YAML for AC TRIAC Dimmer: Standard and DimmerLink

Feb 26, 2026

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TL;DR: Two ESPHome integration methods exist. The standard ac_dimmer platform works out-of-the-box but has ISR/WiFi conflicts on ESP32. The DimmerLink external component uses a hardware controller for...

ESP32 ac-dimmer dimmerlink esphome tutorial

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

Feb 26, 2026

0 29

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;...

Arduino ESP32 TRIAC ac-dimmer buyer-guide dimmerlink tutorial

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

Feb 26, 2026

0 29

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...

Arduino ESP32 ac-dimmer troubleshooting zero-cross

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ac-dimmer Arduino berry buyer-guide dimmerlink ESP32 ESP8266 esphome flicker halogen home-automation I2C incandescent IRAM_ATTR leading-edge LED linux MOSFET MQTT multi-channel python raspberry-pi RBDdimmer safety smart-home tasmota theory trailing-edge TRIAC troubleshooting tutorial WiFi zero-cross