Christmas LED Light String Display

Posted on Feb 7, 2014

This project shows how to build a simple LED light string display using seven 24V LED light strings. I built this project for Christmas 2009 in order to decorate my balcony with lights. The light strings used are very common and (at least in Sweden) can be purchased from many places during the Christmas period. The hardware design is very simple a

Christmas LED Light String Display
Click here to download the full size of the above Circuit.

nd uses a 24V 2A switching power supply which is controlled via a ULN2004A to turn the LEDs on an off. An LM2576 switching regulator is used to provide the PIC18F2550 with 5Vs (I used a switching regulator since 24V to 5V is quite a large step). The circuit board is a single layer board with through-hole components and is very easy to make. The connections to the LEDs are made though `pin and spade` style speaker connections (since that was what the light strings came with). Here is a picture of the completed board: If you like this site and want to help support future projects, or you just want to show appreciation for a project you built, used or enjoyed, please consider leaving a PayPal donation. It`s quick, secure and helps us to run the site and fund future projects! The owner of this site is a member of the EFF and you should be a member too! The EFF protects the rights of open-source, open-hardware authors all over the world.

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