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

  • See http://docs.platformio.org/en/latest/installation.html for instructions

• 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

• 

• 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).