X-mas Tree

As it is Christmas time and I wanted to do a simple, cheap and fun project, which works as a development board at the same time, I created this X-mas tree.X-mas Tree

The project features an USB capable PIC16F1549 µC with:

  • USB FS device
  • 48 MHz internal Oscillator
  • 2 PWM modules
  • 10-bit ADC with Voltage Reference
  • Integrated Temperature Indicator Module

The LEDs are connected to the 2 PWM outputs via N-mos drivers. A Potentiometer is connected to one ADC channel for controlling the brightness of the LEDs or possibly the speed or variation of animations. Different modes of the X-mass tree can be switched by pressing a push button.

Schematic / LayoutSchematic X-mas Tree

The schematic shows that the µC is directly connected to USB. This is definitely bad practice, as the µC has no ESD protection. In several other projects I used a SOT23-6 USB ESD protection diode array and sometimes two additional serial resistors.

A 500mA Fuse F1 was added to protect the PC or power supply in case of a short circuit our failure. This will be an important step, as the X-mas tree will be used for a soldering workshop for working students and  anybody interested in electronics hardware or embedded software at my new job at NavVis in Munich (therefore the NavVis logo on the PCB).

The Layout is designed for two different levels of soldering skills. It features a TSSOP IC, a SMD USB connector and some 0603 resistors and capacitors for the skilled and through hole LEDs for soldering beginners.

For more detail: X-mas Tree

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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