UV LED as UV Sensor

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During the eTextile Summercamp we experimented on the topic of Educational toolkits.
The thread some people started to work on was called “Go cheaper, delve deeper”, or on how you can make low cost sensors with really basic materials. By using only simple components, you have to go to the base level understanding and use of the electronic(s) part(s).

In this pocket size project we looked deeper into the led, the light emitting diode. An Led can also be used as a photodiode, sensing light instead of emitting – this website explains in detail how this process works.
A Uv led emits Uv light – other leds have been produced to filter out this light frequency. We wanted to measure the Uv in sun light – so, for the reverse process – you need the Uv led (as the other ones are blocking this type of light to be emitted, the same goes on the receiving end).

Uv light is converted into sound & light. The more Uv in the sunlight, the brighter the led shines, and the tones in the piezo change.

Ingredients:
– AtTiny
– UvLed
– 3 MegaOhm resistor – this depends on your UvLed – test it out! it could be more or less megaOhm
– red led
– 100 Ohm resistor
– piezo
– power supply
– code
– sunshine

Go here for more details and to download source files.

Circuit sewn by Anja hertenberger
Code by Jussi Mikkonen & Arduino

One Response to UV LED as UV Sensor

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