Decorative lighting has become quite popular, with options such as LED surface panels, strip lights, COB lights, spotlights, and profile lights that are widely used in residential and other interior design. Lighting choices vary based on client needs, offering flexibility to both homeowners and designers. This smart lighting controller serves as a chasing panel solution to set the mood, create ambience, and elevate the overall feel of a space.
The controller integrates a microcontroller, a radar motion sensor, and a NeoPixel LED strip.
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Table of Contents
When motion is detected, the LED strip gradually switches on, lighting each LED sequentially in a warm colour. As movement continues, the strip transitions through a series of warm hues—such as orange, gold, and pink—changing every second to maintain a cosy atmosphere. If no motion is detected for 10 seconds, the LEDs fade out in reverse order, creating a smooth shutdown effect. This makes the device ideal for hallways, bedroom lighting, or any decorative setup that responds to movement.
Fig. 1 shows the prototype on a general-purpose PCB, with the ATtiny85 microcontroller placed in its socket and wired to the radar sensor. All components required to build the controller are listed in the Bill of Materials table.
| Bill Of Materials | |
| Components | Quantity |
| Neopixel LED array LED1 and LED2 (each 1 metre) | 2 metres |
| ATtiny85 (IC1) | 1 |
| RCWL0516 microwave radar (S1) | 1 |
| MCU programmer (Arduino Uno) | 1 |
| Small general-purpose PCB | 1 |
| 5V power supply | 1 |
| Flexible wires | As needed |
As the ATtiny microcontroller requires programming and the bare IC does not feature an onboard programmer, a separate programmer is needed. Alternatively, an Arduino Uno board can serve as the programmer. In this case, the Arduino Uno has been used to program the ATtiny85.
However, it is also possible to skip these steps and use the Arduino Uno board directly as the main controller instead of the ATtiny85. The ATtiny85 was selected due to its compact size and suitability for embedded lighting control.
Circuit and Working
Fig. 2 shows the circuit diagram of the smart LED lighting controller. The circuit consists of NeoPixel LEDs, an ATtiny85 microcontroller, and an RCWL microwave sensor. The system can be powered by any 5V, 1A SMPS (such as a mobile charger), which is suitable for a 1-metre strip with 60 LEDs, or adjusted based on the current requirement of the LED strip, calculated at 60mA per LED at 5V. The power requirement in watts can be calculated using the following relationship:
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