My Secret Santa this year is a huge star wars fan. Since I already bought her something else, and I wanted to keep everything under budget, I decided to make this.
A Star Wars picture frame. Operation is simple: it works like a night light. When the photoresistor receives less light, the LEDs glow brighter. So it acts as a nightlight at night, and can be turned on by just covering up the photoresistor at any time.
This can be built quickly, cheaply, and I didn’t have to buy anything since I had this kind of stuff laying around.
- Green LED
- Blue LED
- Resistors (values:
- NPN Transistor (2N2222 was used)
- 9V battery and holder
- Picture frame
- Drinking straw
- Hot Glue Gun
- Soldering Iron
Prototype the following circuit to make sure everything works.
I based the circuit on a basic not gate (pic for reference).
Now that the LEDs light up when you turn the lights around it off, it’s time to solder it all together.
Attach the circuit to the frame.
Wrap and give away. Merry Christmas 😀
Here’s a video of the build. As you can see, I was definitely riding the struggle bus. I didn’t have the right resistors on hand so I tried a bunch of equivalent resistor calculations and ended up giving up and stealing some from another lab. I also saw that the AA’s I was using were going to be too big for the back of a frame, so I went with a 9V. If I were to do the whole thing again I could probably do it in about in hour. You learn more from failures anyway, right?