I plan to make all kinds of throwies..
I have made 2-3 kinds..
so lets begin:
1) The simplest ones are the always-on led throwies with a magnet and a Li 3V cell.. which dnt last more than a week..
I put this kind (a blue LED) behind a sketch of a doll.. just behind her hair.. which give a nice diffused glow at night..
The additional ingredients for the ckt. are a phototransistor/ photodiode and a transistor and a resistor.
The circuit diagram is as shown :
Using a photodiode : (I used it as it is a cheaper option to a phototransistor)
Testing on the breadboard :
When the photodiode is in a bright ambiance, the LED would glow dim; and when the ambiance is dark, LED glows bright.
So, here’s the testing:
After soldering and putting a magnet on the back, and covering up the whole thing with transparent tape, looks like this :
But there were issues with this one as well.. whenever a tubelight was on in the room, at night, it wouldnt detect that, and would keep glowing.. So it detects natural daylight well.. bt not other kind..
So I finally thought of making a throwie with a switch, which would glow on n off whenever u want it to.. and u dnt need any transistor or resistor etc..
n it works glows nicely! 🙂
Here is the final one..
The ckt diagram is simple, just a switch between the battery and the LED.
So go on and Make something! 🙂