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ESP32 Light Dimmer

An attempt at a multi-channel incandescent light dimmer using the ESP32. Will eventually provide HTML/javascript based UI for dimming lights.

Status

Still under construction. Able to do fades of up to 4 dimmer channels.

Experiments with the LEDC peripheral revealed a need to perform dimming manually (instead of with LEDC fade functionality) due to inability to adjust PWM phase via dimming. So, we implemented the dimming logic inside zero-crossing interrupt routine, but needed to perform all math as fixed-point due to hard faults when doing floating point in ISR.

Next step is to implement HTML/wifi based control. Looking at possibly using

Hardware

• Sparkfun ESP 32 Thing (although any ESP32 module should work, possibly with changes in pin configuration).
• 2x 4 channel AC light dimmer board (but any MOSFET-based dimmer board with zero-crossing detection should work).

Building

Requires ESP32 IDF.

export IDF_PATH=/path/to/esp-idf
make menuconfig
make flash