This project is a PCB soldering kit in the shape of an ornament, designed to be hung on a Christmas tree. The kit has been designed with some SMD and THT parts. If you plan to use this design as a kit for people who have no/minimal soldering experience, it is recommended to pre-solder the SMD parts before giving the board to them for them to solder.
Click the GitHub folder below to access the project's files, which include the KiCad PCB files, the Gerber files, and the Autodesk Inventor CAD files.
This kit has some THT and SMD parts to be soldered (THT means through-hole, and SMD means surface-mount).
|PCB Reference||Part Description||Package Size||Quantity per Board|
|C2||1uF Decoupling Capacitor||SMD-1206||1|
The circuit is based on the 555 timer. The chip, if set up as done in this circuit, will act as an oscillator which will generate a square wave on the output where the frequency is dependent on R1, R2, and C1. With the chosen values, the output will have a frequency of 1.2Hz(the output will oscillate once every ~0.85 seconds). This output is used to drive 6 LEDs when the output is a LOW. The other 6 LEDs are set to be on when the output of the 555 is a HIGH, but this can be changed with the 2 available jumpers (WARNING: If changed the jumper incorectly, you can possible short out either the 555 or the power supply. If you want to change the other 6 LEDs so they blink with the first 6, cut the short in the jumper on the PCB with a knife, then solder the middle pad to the pad that wasn't previously connected(refer to schematic for details))
Here is the PCB's schematic:
Here is some diagrams relating to the project:
The PCB is designed to be screwed into a bettery holder and to be hung on a Christmas Tree. The STEP and STL files for the battery holder for the ornament can be found in the GitHub page.