“Made a wearable Small Necklace or pendant with custom Tear shaped PCB and Attiny13A
The goal here was simple, to make a small Blinky board that can be attached to a chain so we can wear it like a locket or pendant.
There are a total of 24 LEDs in this Pendant, I’ve divided LEDs into pairs of 4.
This means 6 LEDs are connected in parallel and they are driven by a single AO3400 N channel mosfet. there are a total of 4 of these which control 6 LED segments each.
These 4 MOSFETs are then controlled by an Attiny13A, I’ve added a button with its D4 Pin which starts the LED sequence.
Materials:
- 0603 Blue LEDs x24
- Custom PCB which was provided by PCBWAY
- Attiny13A
- AO3400 N channel mosfet x4
- 10K 0603 Resistor x4
- SMD Coin Cell holder CR2032”