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RGB LED Breathing with I2C Control

Pulse-based Control Application

The GreenPAK can be configured to control an RGB breathing LED controlled via I²C. Changing the CNT0 counter data changes the breathing period.

Necessary Components

Any GreenPAK with I²C
One RGB LED
Three resistors

GreenPAK Diagram

Design Steps

1. Create a soft ON circuit as shown in Technique: Creating LED breathing but instead set the counter data for CNT1 and CNT2 to the same value.

2. Add MF0 which adds a small offset between CNT1 and CNT2.

3. Configure LUT3-LUT5 as a multiplexer switched by the EN signal controlled via I2C.

4. Configure LUT0-LUT2 as a demultiplexer which passes the breathing signal according to the timing diagram in Figure A.

Resources

GreenPAK Designer files

RGB LED breathing with I2C control (5.41 KB)

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