Smart mirrors are an exciting DIY project, often combining a display, lighting, and sensors into one sleek setup. But one common issue beginners face is managing low-voltage power safely and efficiently.

The Problem: Inconsistent or Unsafe Power Supply

Smart mirrors often run on 5V or 12V—especially when using components like Raspberry Pi, LED strips, and touch sensors. Using a generic power adapter can cause:

• Overheating

• Voltage drops

• Device instability or failure

The Solution: Use Dedicated Low-Voltage SMPS or Buck Converters

For optimal performance:

• Use a 12V SMPS for LED strips

• Step down to 5V with a buck converter for Raspberry Pi or microcontrollers

• Add fuses or reverse polarity protection diodes for safety

Practical Example: Mirror with Raspberry Pi and LED Strip

Let’s say your smart mirror includes:

• 12V LED strip (2A)

• Raspberry Pi 4 (5V 3A)

Fix: Use a 12V 5A SMPS. Connect the LED strip directly and use a buck converter (12V to 5V 3A) for the Pi.

Sample Calculation: Total Power Budget

LEDs: 12V × 2A = 24W

Raspberry Pi: 5V × 3A = 15W → Needs 15W ÷ 0.9 (efficiency) = ~16.7W from 12V

Total = 40.7W → Use a 12V 5A (60W) SMPS

Product Suggestion (Made in India)

Power up your mirror smartly with these local components:

• Buck Converter Module – For regulated 5V output

• Flux Paste – For clean, secure solder joints

Shop now at SmartXProKits.in
Support our work and India’s innovation—buy from our Make in India site!