Bluetooth LED White & Shade Combine LED Reference Design

The design integrates microcontroller expertise with Bluetooth connectivity for environment friendly and customizable LED management.

Bluetooth LED White and Shade Combine LEDs are fashionable lighting techniques that mix vitality effectivity with consumer management and customization. These lighting options enable customers to regulate brightness, color temperature, and hues instantly from smartphones or different Bluetooth-enabled units, offering comfort and flexibility. Appropriate for residential and business environments, these LEDs can rework and adapt areas to swimsuit numerous moods and actions and combine into broader sensible dwelling techniques. In addition they supply the potential for vitality financial savings and improved accessibility, making them a sensible alternative for sustainable and inclusive lighting. The reference design from Microchip successfully integrates a buck LED driver (HV9961) with a PIC16F15313 8-bit Microcontroller. 

Communication between the microcontroller and the BLE module (RN4871) is achieved via UART, facilitating an clever LED lighting resolution. The facility provide for the microcontroller and the BLE module is sourced instantly from the grid at 120/230Vac utilizing a bridge rectifier and a DN2470 depletion Area-Impact Transistor. This setup is stabilised by a 3.3V Low-Dropout (LDO) Regulator MCP1703, enabling the system to deal with a broad enter vary from 50 Vac to 265 Vac.

The design additionally includes a passive Energy Issue Correction (PFC) mechanism that maintains a PFC of at the very least 0.9 at 120Vac and 0.85 at 230Vac. The buck LED driver employed within the demo operates utilizing common present mode management in a relentless off-time mode. This configuration eliminates peak-to-average error, enhancing the LED present’s accuracy, line, and cargo regulation with out requiring loop compensation or high-side present sensing. The LED output present maintains an accuracy of ±3%.

Within the realm of Bluetooth connectivity, the demo incorporates the BLE module. This module combines a Bluetooth 4.2 baseband controller, an onboard Bluetooth stack, digital and analogue I/O, and an RF energy amplifier right into a singular, low-energy resolution. The BLE module includes a proprietary GATT service, “Clear UART, ” which facilitates easy serial information switch over Bluetooth Low Power units, permitting seamless bidirectional information movement between the microcontroller and a smartphone.

The microcontroller processes information obtained from the Bluetooth module, controlling the LED’s color temperature and depth primarily based on consumer inputs through a cell software. It additionally shops the final set of values in its flash reminiscence, that are then used as default on the subsequent power-up.

For the LED configuration, the design makes use of 20 LEDs organized into two interlaced strings of 10 LEDs every, every providing a unique white color temperature (heat/cool). This LED load is designed to function at 30 V / 275 mA. The cell software enhances consumer interplay with the design, providing sliders to regulate the brightness and color temperature of the LEDs and buttons for toggling the sunshine on/off and activating an indication characteristic.

Microchip has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra information concerning the reference design. To learn extra about this reference design, click on right here.