I want to make a simple circuit for my lover, so I come up with using four 7-segment LEDs to make the word “L O V E” for her.
List of materials:
1. Four 7-segment LEDs
2. Resistors
3. A wooden prototype board
4. USB cable cord
5. Solder iron
6. Paper Clip
7. A plastic box
8. Red papers
Step 1 – Paint the wooden prototype board in White.
Step 2 – Put the 7 segment LEDs on the board
Step 3 – Solder!
Simply connect the “ON” segment pins to +5V and ground each of segment.
For detail, please check out this website: 7 Segment LEDs
I break the paper clips into three wires and organize them into three parallel lines to ease of soldering. You will see how simple it is. Finally cut of the usb cable and use only the +5v and GND lines. I didn’t have the many resistors around, so I put few of them and test the brightness. You can find the best resistor value yourself.
Step 4 – Power up by USB
Step 5 – Packing it
In order to make it nice enough to put near her computer desk, I put the board into the circular plastic box and put some red papers to it. Hah..looks like a LOVE bomb 
I spent about 2 hours at mid-night to do this project, it is really simple and fun:)
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