A Christmas Tree shaped PCB with 5mm LEDs as it's baubles and star.Designed by Brian Lough in Ireland
What is it? It is a PCB in the shape of a Christmas Tree with 12 charlie-plexed LEDs. The board is controlled by an Atinny13 and is powered by a Cr2032 coin cell battery. Why did you make it? I wan...Read More…
It is a PCB in the shape of a Christmas Tree with 12 charlie-plexed LEDs. The board is controlled by an Atinny13 and is powered by a Cr2032 coin cell battery.
I wanted to make a version of my PCB3 that was easier for people to assemble. The original PCB3 has reverse mounted LEDs that are challenge for people less experienced with soldering. This version still has SMD components, but is much easier to solder in general.
The PCB can be hung from a tree, it can free stand using the battery holder as a stand or be added to a badge using an SAO connector (4 pin).
You can select different modes for the LEDs using the built-in button. There is also a switch for turning off the power.
It can be fully modified/hacked using the AVR ISP pins. The base code can be found here
In support of the effort to plant 20 million trees by the new year, I will donate 1 tree ($1) for every THPCB3 purchased. For more information, check out teamtrees.org
You can switch between running modes by holding down the button on the back. When you hold down the button (this might take a second or two) the animation will stop and a single LED will light up, keep holding the button and the single LED lit up will change. Each of the different LEDs represents a different mode.
The modes are: - Single LED flash (Speed 1-5) - Dual LED flash (Speed 1-5) - All LEDs on - ALL LED blink
Please note there are no batteries included (CR2032 required)
Additional information about the PCB3 can be found on my website
New for 2019 is a USB PCB Coin Cell add-on. It is two PCBs designed to be the same dimensions as a coin cell battery with a micro USB connector so you can power the PCB3 directly from USB. These are assembled and ready to just insert into the PCB3 coin cell holder. What I like about this solution is you can swap between USB powered and battery powered whenever you need to.
There are two important to note about them: - They are not pretty! Small circular pcbs are quite difficult to clean the edges of the PCB of, they also look kind of scratched when inserted and removed from the coin cell holder (they come pre "scratched" as I have tested them) - These do not regulate the voltage to match a coin cell, the PCB3 can accept 5v. Do not assume you can use it with any other PCB without checking that it can accept 5v first.
So this is kind of a strange section but I just wanted to thank Dave for his help getting the tree this far, my schematic and code was almost entirely based on his sloth badge. I got all this information and inspiration with his permission in case anyone is wondering!
Time: 20 mins. Additional Tools Required: Tweezers Difficulty: Easy/Medium - The biggest challenge will come from the SMD components, but they are widely spaced out so it should be relatively straight forward to do.
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