/esp32-leds

Primary LanguageC++

ESP32 LEDs

Effects for individually addressable (WS2812B) LED strips, based on Dave Plummer's code at https://github.com/davepl/DavesGarageLEDSeries.

The project uses the Heltec WiFi Kit 32 v3 board: https://heltec.org/project/wifi-kit32-v3/

Board Pins

J2, pin 1: GND

J2, pin 3: 5V external PSU

J2, Pin 14: LED control signal (GPIO 05)

J3, pin 6: External power detect (GPIO 47)

Supply external power at 5V via a suitably beefy diode, such as an SR5100, but connect the external power detect pin to the external power before the diode, with a pulldown resistor to ground (say, 100K). This will bring the pin high when external power is present, but not when running on USB power, allowing the LEDs to run at full brightness, or a safe brightness when using USB only.

It is also possible to disable power management entirely, by browsing to /setup on the ESP32's web interface once up and running. This is appropriate when the LED strip is powered independently of the ESP32, that is, there is no power fed to the LED strip from the module itself. This can be achieved by powering the strip directly from the external power supply, and also feeding that power to a voltage regulator module to power the module.

Hardware

The hardware/ sub directory contains a case design as .3mf models that can be sliced and 3D printed. The case lid holds the microcontroller, with a port for the USB connector, buttons, and a hole for the OLED.

The CAD drawing can be found in Onshape if you wish to fork it.

To insert the microcontroller, push the USB connector into the hole, under the tab. Then use an M2 x 6mm self-tapping screw with a 2mm ID/5mm OD, 1mm thick nylon washer to secure the other end of the board. The board should sit in the recess on the post, and the washer should overlap the top of the board.

The body of the case has an 8MM hole at one end for a standard 2.5x5.5mm barrel connector, and a 16mm hole with locator sides for a 3 pin aviation style connector.

Parts