Mini project: Heartbeat Keychain

Heartbeat keychain is intended to be a small gift that your loved one can carry with her/him wherever she/he goes.
Basically top side of the PCB is touch sensitive and has one RGB LED. When the exposed copper on the top side is touched, the microcontroller detects it and begins to pulse the LED in the heartbeat like pattern.

Bill of material, schematics and source code are available on GitHub.

I am posting render images of the PCB since I’m waiting for the Fab house to manufacture the boards for me.

Board size is 40mm x 36mm

Custom RGB LED strip controller

This weekend I have found some RGB LED strip laying around so I decided to build custom RGB LED strip to decorate my room. The RGB controller that I’ve built is based on Microchips PIC16F1455 microcontroller. It works as ambient light in my room and also there is an option to use it as mood light (randomly  change colors every 4 minutes) and to select predefined or your own custom color via the IR remote control.


Some of the (current) features include:

    • Remote control (you control all of the functions via simple IR remote)
    • 10 custom presets (Selectable via 0-9 buttons on remote)
    • Mood light (activate to randomly change color of the room every 4 minutes)
    • Loop trough presets ( with next/previous buttons on the IR remote)
    • Custom color selection ( chose red/green/blue channel and then increase or decrease light intensity with + and – buttons on the remote to get any color that you like).

Here is the Youtube video to check how it looks in action. I really hope you like it and let me know what do you think about it!

Simple Stereo LED Light Show

This is the Light Show made from LEDs and few discrete components like resistors and transistors. It transforms audio signal into light signal with LEDs. We have used two types of LEDs, white and blue, each one for different sound channel (from stereo audio output).

Our prototype was first built on solder-less breadboard. Link to YouTube video

Components that are required for this build:
– 5 VDC regulated power supply (You can use your USB cabel)
– 2 NPN transistors (any transistors will work, we have used BC547 for our prototype) (for one channel)
– 1x300K resistor and 1x33K resistor (for one channel)
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