This is a simple shield for the PTL-ino / Arduino Uno.

• It has 7 LED that can be addressed individually
  • LED are 3mm type with coloured plastic shells I had lying around
  • I am using 3x green, 2x yellow and 2x red
• Each led is connected to a digital pin of the Arduino and a resistor
• There is no connection to the arduino VCC
• There is a connection to the arduino ground. PCB design uses a ground fill (common for GND pin and LEDs cathode)

• Version 1.2
  • Fritzing file v.1.2 (zip)
  • Exported Gerber/drill file
  • Change log
    • Changed used pin from 1-7 to 6-12
      • As pin 1 is used for serial and not a good idea to use
      • Also it result in a smaller PCB size

• Version 1.1
  • Fritzing file v.1.1 (zip)
  • Change log
    • Replaced copper fill with trace to avoid issue with milling - as recommended by Magnus (1)
    • Removed useless traces on bottom PCB layer (only top layer is used)
    • Set Frizzing grid to 1mm (instead of inch), measured components
    • Rearranged component on the PCB / changed spacing
      • The 3mm LED are now placed one next to anther which should be fine
      • Extra space to leave ~2mm between PCB edge and drilled holed (unsure if needed)
    • Export zip file only contain what's necessary for PCB production using CNC milling

(1) Copper fills are nasty when it comes to milling. The reason is that the tool that converts the gerber to drill paths can increase the width of the traces if there is space, which makes milling more easy.

• Version 1.0
  • Fritzing file v.1.0 (ziped)

This is single layer PCB with ground fill. In this design, the componants and pin headers are on the back side.

This means the Arduino must be placed with the back facing toward you in order to see the leds.

Version on a prototyping board done before PCB design. In this version, resistance are on the back of the PCB and led in front.

I intend to mill the PCB using the Cyclone PCB factory V2 in the lab. I will counting on Magnus help.

We're aiming to make it easy to mill (simple) PCB in the lab. This will involve documenting the process…

You can use sample led code from Arduino IDE.

* All that is needed is to set pin 6-12 to output. * When the output is set to high, the led will turn on and vice versa.

Example sketch might follow.