Duckjaws

duckGLOW SAO

duckGLOW is an SAO with a glowing rubber duck, lit up by an RGB or UV LED, controllable over I2C, or like an addressable LED following the WS2812 'standard'.

See hackaday.io for more information.

See examples folder for sample code to run on the SuperCon 8 SAO badge, or an Arduino.

I have a few assembled units of the duckJAWS variant for sale on Tindie.

I2C Interface

The LED of the duckGLOW SAO can be controlled over I2C.

The SAO has four channels: red, green and blue for the duck LED, and on the duckJAWS variant, red background lightning.

The SAO implements smooth fading configurable per channel. The LED brightness fades between max and min value, at the chosen speed. If speed is 0, the LED will steadily glow at the configured maximum. The phase parameter sets the offset in the fading waveform.

The mode register can be used to select the interface for LED control (auto-detect, I2C or WS2812), and to check what type of LED was detected (RGB or UV).

The current settings can be stored as power-on preset by writing decimal 42 to the save register. The power-on presets can be factory reset by writing 24 to the save register.

I2C Address

The default I2C address of the duckGLOW SAO is 0x6C. The address can be changed by closing solder jumpers on the back of the circuit board.

I2C Registers

Register are accessed by first writing the 8-bit register address, and then reading or writing register data. The register address will auto-increment and multiple registers can be read or written within a single I2C transaction.

For example to read the max RGB colors with an Arduino:

Wire.beginTransmission(0x6C);
Wire.write((uint8_t) 0xEC);
Wire.endTransmission(false);
Wire.requestFrom(0x6C, 3);
while (Wire.available()) {
  char c = Wire.read();
  Serial.println(c, HEX);
}

And to set the red LED to maximum brightness:

Wire.beginTransmission(0x6C);
Wire.write((uint8_t) 0xEC); // red led max brightness
Wire.write(0xff);
Wire.endTransmission();
Wire.beginTransmission(0x6C);
Wire.write((uint8_t) 0xF4); // animation speed
Wire.write(0x0);
Wire.endTransmission();