Product Description

RGB LED Ring

What is it?

This is an accessory for the rotary encoder. There are 48 RGB LED disposed in a circle, the diameter of the circle is 40mm.


There is also a 9mm hole in the center where it's possible to insert the rotary encoder. All the LEDs can be controlled individually with the i2c bus, the resolution is 24bit for each RGB led.


The controller is the IS31FL3737, it has several features like:


256 steps Global Current Setting

Individual on/off control

Individual 256 PWM control steps

Individual Auto Breath Mode select

Individual open and short error detect function

Supply voltage range: 2.7V to 5.5V

It's possible to connect up to 4 RGB LED rings on the same bus.


What makes it special?

There are several alternatives made with the WS2812, but the LEDs are big with a low density. The RGB LED Ring density is higher because it uses a 2x2mm RGB LED.


With 48 LEDs, it has exactly double of the number of the most common rotary encoders. In this way, it's possible to make some effects without losing in resolution.


There are 4 SMD Jumpers where it's possible to set the I2C address, only 4 combinations are possible.


It also has another SMD jumper where it's possible to enable the pull-up resistor on the I2C bus.



VCC and VIO can be different, for example VCC=5V and VIO=3.3V. With VCC=5V and all the LEDs on the current consumption is around 450mA, make sure that you power supply can give that much current!


Documentation

The documentations of the project is available on GitHub


There are the:


Gerbers, BOM and pick and place

3D file of the board

Schematic

I will also add the Arduino library!


Package

The package includes 1 RGB LED Ring with a 30cm cable


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