Free Energy From LEDs
Intro: Free Energy From LEDs
STEP 1: Round Up Some LEDs!
First you'll need to get however many LEDs you want. You'll then want to connect the LEDs in a series, leaving a positive and negative wire.
NOTE: This works with any LEDs, but I have found that it works best with Red LEDs
NOTE: This works with any LEDs, but I have found that it works best with Red LEDs
STEP 2: Go Towards the Light!
Then you'll want to get a light source (lamp or daylight) and put the circuit right in the strongest part of the light.
STEP 3: It's As Simple As That!
Just hook up the wires to a voltmeter and you'll see how much power they are generating. I was able to produce 1 volt just by using 3 LEDs and a bright lamp.
(As if you couldn't tell, this is my first ible, so some advice would be greatly appreciated)
Inspiration for this project and more information on how this works can be found at https://www.instructables.com/id/Better-LED-as-light-sensor
(As if you couldn't tell, this is my first ible, so some advice would be greatly appreciated)
Inspiration for this project and more information on how this works can be found at https://www.instructables.com/id/Better-LED-as-light-sensor
14 Comments
uwezi 8 years ago
An LED is a very poor solar cell in the same way that a solar cell is a very poor LED. Both are optimized for their primary function: to emit light OR to convert light ot electricity. Both work in the opposite way as well, but apart from studying the underlying physics there is nothing to be gained from using LEDs as solar cells.
Get a cheap solar-powered garden light for EUR 0.50 or an equivalent amount of money from your nearest hardware store and you get an LED and a useful solar cell module for your projects.
Throttle78 10 years ago
assasinsareus 9 years ago
I'm afraid even with 4,000 LEDs you would struggle to actually power something. Voltage and Current are interdependent. A large voltage does not mean a large current. Power in terms of Watts is represented in terms of Voltage x Current. You would be much better off with actual solar cells. Using the LED as a light sensor is a good use for this phenomonon.
zeldekins 10 years ago
Throttle78 10 years ago
lean04 10 years ago
Bastl3r 10 years ago
The current that is generated could be used to indicate sunlight (or the absence of it) as shown in this schematic ( http://www.dieelektronikerseite.de/Pics/Tricks/Dioden-Sperrstrom%20S01.GIF) , the D1 is the diode in the way you use it.
Your method of producing energy is barely enough to keep a microcontroller in low-power-mode, but not using it to make any program run.
With an array of 1000 LEDs in parallel you could produce about 1-10mA which would be nothing fancy, if you think of the costs compared to a little solar power module.
Most of the energy you put into the LEDs (the 100W lamp) is wasted, because of the less energy you get out
P = 1V * (ca. 1-10µA) = 1-10µW.
Even if it would be more current (for example 10µA per LED) the output of power would still be around 30-50µA with 3-5 LEDs
I would suggest a net of lemons to build a lemon battery or some other chemical ways (vinegar and copper) which produce more power than the LEDs in reverse.
lean04 10 years ago
andrea biffi 10 years ago
Kiteman 10 years ago
Have you powered anything with them yet?
Kimerserd 10 years ago
Throttle78 10 years ago
mman1506 10 years ago
mettaurlover 10 years ago