XMAS2020

Idea

At beginning I wanted to use just through hole components but there wasn't enough space, I used a mix of them.

This is my sketch made on general purpose pcb.

After getting some shape with hardware requirements the next step was make a prototype on breadboard.

This was the firts go using the charlieplexing technic, I think it's almost like controlling RC servos by software but changing the gpios config.

One LED turning on at time.

PCB Design

The pcb profile is asymmetrical and follows my sketch drawing, I wanted to keep the same aspect.

It's fast and easy with autodesk fusion 360, pulling the complex PCB profile directly to your board.

• Take a picutre of the sketch drawings
• Import that picture into autodesk fusion 360
• Scale it to wanted size
• Draw a sketch following the picture outline
• Make it a PCB
• Pull that PCB from Eagle
• Now you get the dimension Layer, a close profile.

Schematic

The circuit os based on pic10F322, 4 GPIO MCU , powered by a cr2032 3v battery.

Programming

• MPLAB X
• XC8 compiler
• 
  

The code almost fill the memory space, 95% XD, the animation is stored at flash program spaceas as an array. Each byte represent a LED, of course I could use a bit value and stored in a byte but it was enought and fast for now.

The cpu clock is set up at 4MHz, it can go faster up to 16MHz but theres no need.

On the back side there is the ICSP terminal, 0.1inch pitch, witouth pogo pin I had to improvise using jumper wires as jig.

Components

Tools :

• autodesk Eagle
• inkscape
• svgtoeagle

Video

All files availabe.

BOM - Bill of materials

Firmware - MPLABX 4.15 & XC8 1.45 compiler

- HEX File

Gerber - Gerber Files

PCB - Eagle 9.6.1 Educational version

- Schematic file

- Board file

Schematic - Schematic PDF file

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