This project was made with 5mm LEDs and Led Mounting Hardware T1-3/4 Clear Standard to better visualization, and so using 3 LEDs for showing separately its colors Red, Yellow & Green respectively.
Step 1: Bill of Materials
What you will need:
1 5mm Red LED
1 5mm Yelow LED
1 5mm Green LED
3 Led Mounting Hardware T1-3/4 Clear Standard
1 Arduino Nano
1 Plastic enclosure of 3.2" X 1.6" x 0.8"
1 USB-A to USB-mini Cable
Drill bits of 1/4" & 1/2"
Step 2: Schematic
Look at the schematic so that you can do a good job. Check that you will have to connect Red LED to pin 2, Yellow LED to pin 7 and Green LED to pin 12 from Arduino nano respectively while connecting each other the cathodes of the LEDs and the common connection of those to GND.
Step 3: Beginning the Project
Use the drill bit of 1/4" so that you can form the front panel of your project by making three holes. You will also have to use the drill bit of 1/2" to make the hole where passing through the USB-A to USB-mini cable.
Step 4: Installing the LED Mounting Hardwares
Mount the LED Mounting Hardwares by inserting them in the 1/4" holes made previously.
Step 5: Installing the LEDs
Insert the LEDs into the LED Mounting Hardwares, and solder the cathodes each other of the LEDs.
Step 6: Placing the Arduino Nano
Step 7: Join LEDs With Arduino Nano
Solder the the wires previously inserted in the Arduino nano and cut the excess.
Step 8: Enjoy Your Project
Close your plastic box by using the screws included in the own box and proceed to plug in it to the computer.