How to make a LED Ring Light?

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2014
led ring
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Do you want to learn how to generate great LED effects? Here is a LED ring reference design that achieves vivid lighting patterns with 29kHz PWM dimming

Devices such as speakers, TVs, refrigerators, set-top boxes and smoke detectors have become intelligent and connected with each other. They can now be controlled by users remotely or through voice wakeup. This means they will also require an improved human-machine interface. A light-emitting diode (LED) indicator like an LED ring, LED matrix or red-green-blue (RGB) LED lighting interacts with users by changing patterns, such as chasing or blinking.

All you need to generate great LED effects is a smart LED driver with these key features:

  • The ability to drive multiple channels with a proper communication protocol like I2C. A microcontroller (MCU) could talk to this device and control each channel independently, without consuming a lot of general-purpose input/output.
  • High-resolution pulse-width modulation (PWM) control for changing the brightness of the LEDs.
  • A very low quiescent current, as well as a proper power-saving mode.
  • High-frequency pulse-width modulation to avoid audible noise, since many LED indicators are used with speakers.
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TI’s LP50xx family of multichannel, RGB LED drivers, is a good fit with this feature list. The devices enable designers to achieve seamless, smooth animation in applications that use a human-machine interface, such as portable electronics, building automation and appliances.

Various LED Ring Lighting Patterns Reference Design

TI offers a reference design that enables human-machine interface scenarios with an LED ring. The design utilizes two LP5024 LED drivers to create vivid lighting patterns. In this reference design, the LED drivers drive 16 RGB LED modules with constant current control. OPT3001 ambient light sensor senses the ambient light dynamically. The MSP432P401R LaunchPad sends the control signal to adjust LP5024 analog current and generate the various lighting patterns

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Features

  • Vivid lighting patterns with 12-Bit, 29-kHz PWM dimming through an I2C interface
  • Ultra-Low standby current down to 10 μA with automatic power saving mode
  • Programmable banks (R/G/B) for easy software control of each color
  • Dynamically adjusts brightness on ambient light sense

Applications

  • Smart Speaker (With Voice Assist)
  • Appliances User Interface and Connectivity Modules
  • Video Doorbell
  • Electronic Smart Lock
  • STB and DVR
  • WLAN/WIFI Access Point
  • Virtual- and Augmented-Reality Headsets and Glasses
  • Printers
  • Video Game Console
  • Home Theater-in-a-Box (HTiB)

Click here for further details.

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