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ESP-LEDCtrl

LED Strip Controller (2x RGB, 1 White) with ESP8266 Homie (MQTT). Display support (SSD1306 OLED) is work in progress.

How to Build

  • If not already installed, install Platformio

  • Clone LEDCtrl + necessary libraries into a directory

    • git clone https://github.com/euphi/ESP-LEDCtrl.git
    • git clone https://github.com/marvinroger/homie-esp8266.git
    • git clone https://github.com/euphi/HomieNodeCollection.git
    • git clone https://github.com/euphi/esp8266-oled-ssd1306.git

  • Link libs into the ESP-LEDCtrl lib directory:

    • cd ESP-LEDCtrl/lib
    • ln -s ../../homie-esp8266 .
    • ln -s ../../HomieNodeCollection .
    • ln -s ../../esp8266-oled-ssd1306 .
    • cd ..

  • Run platformio

    • Ensure working directory is ESP-LEDCtrl and run pio run
    • To upload, use pio run --target upload

Outlook

  • Display support
  • touch controller support
  • Support for "set temperature", so it can be used as thermostat.

Hardware

  • There is a kicad project with a PCB for two RGB outputs and one white channel in the PCB subdirectory

  • 3D Rendering

  • This PCB does not use any SMD parts, so it can easily be built and soldered at home (I created and etched it with "toner transfer", then soldered the parts).

  • The RGB output uses an ULN2003A as amplifier. This is a Bipolar device with limited power, so don't drive LED strips with it without an RGB signal amplifier.

    • Example signal amplifier on Amazon

  • The white channel uses a FET as driver, so you can drive white LED strips.

  • I2C is available on board. Till now, I used it to connect a HTU21 temperature+humidity sensor to it. I will add a touch controller to control the LEDs locally.

  • Serial Programming Interface available. Auto-Reset into flash mode possible with esptool / platformio using the "ck"-reset method (Connect DTR to GPIO0, RTS to Reset)

  • BOM:

    • ESP-12F (Ai-Thinker) (or ESP-12E)
    • ULN 2003
    • P16NF06L
    • DCDC-Converter (Adjustable, set to 12V -> 3,3V) (DAOKAI® 10PCS Standard Stromversorgungsmodul Adjustable Step down 3A DC DC Converter 1pc New)
    • 3x 1/4 W Resistor (Pull-Up/Down; I used 3,16kΩ)
    • Molex 4 Pin Connectors
    • Molex 3 Pin Connectors
    • 2mm Pin-Header to solder the ESP-12E
    • 2,54mm Pin-Header for Serial/Programming interface (use "ck"-Reset method for esptool).