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Ambient lighting

Inverse the natural ambient lighting in a room. This project consists of a light sensor (VCNL4040 connected to an ESP32) and any number of ESP32s connected to 30 LED NeoPixel strips. The light sensor broadcasts ambient lighting data on UDP which is received by the LED strips.

ambient lighting

drawing

Step by step

1. Components

The project uses the following components:

Light Sensor

  1. ESP32 dev board
  2. VCNL4040 (https://www.sparkfun.com/products/15177)
  3. Qwiic cable with female pins (https://www.sparkfun.com/products/17261)
  4. USB to Micro USB
  5. Power source (in my case a power bank)

Pixel Strips

  1. ESP32 dev board
  2. NeoPixel strip with 30 pixels (must be WS2812) (https://shop.m5stack.com/products/digital-rgb-led-weatherproof-strip-sk6812)
  3. Female to male jumper cables
  4. USB to Micro USB
  5. Power source (in my case a power bank)

2. Putting everything together

Light sensor

See this page for wire color coding on the Qwiic cable.

  • GND > GND
  • 3V3 > 3V3
  • GPIO16 > SDA
  • GPIO17 > SCL

Pixel strips

  • GND > GND
  • 3V3 > 3V3
  • GPIO16 > data in

3. Running the program

Prepare the open source Toit language by following the steps here.

Light sensor

Compile an ESP32 image from the light sensor program and flash it with:

cd <path-to-toit-lang>
make flash ESP32_ENTRY=<path-to-repository>/src/als_sensor.toit ESP32_WIFI_SSID=<wifi-ssid> ESP32_WIFI_PASSWORD=<wifi-password> ESP32_PORT=<device-port>

Connect the ESP32 that controls the light sensor to your computer and flash the program by pasting the output from make esp32 into the terminal.

Pixel strips

Compile an ESP32 image from the pixel strip program and flash it with:

cd <path-to-toit-lang>
make flash ESP32_ENTRY=<path-to-repository>/src/pixel_strip.toit ESP32_WIFI_SSID=<wifi-ssid> ESP32_WIFI_PASSWORD=<wifi-password> ESP32_PORT=<device-port>

Connect the ESP32 that controls the light sensor to your computer and flash the program by pasting the output from make esp32 into the terminal.

4. Put up the lights and the sensor

Once the programs have been flashed, they will start running every time the ESP32s are powered on.