destone28

Here's the image, but it's also available full-size in this project! ;-)

? you're right! ?

Hi, you can find all you need to build this sensor on Ebay or Aliexpress, or in some common electronics store.

Great idea! Hope you'll win the contest! ;-)

Sorry for late answer, but I didn't receive notification about your question.As you can see in photos, I used straws that bend gradually in the part of the straw where you can regulate the direction when you use it to drink something! :-)If you use this type of straw, you will be able to have a better measuring range comparing with rigid straws, because, when you bend it, it will have a gradual response, instead of changing instantly the value of the light that passes in the hole of the straw, as in a rigid one.I hope that I answer to your question, if not, let me know! ;-)Thank you for your interest!

Of course, but in this case the fan spun, but the body that holds the blades that was broken: thank you for your advice ;-)

There's a lot to find in home appliances that seem broken ;-)

Thank you :-)

Hey, I thought the same idea :-)I think I'm gonna make it! Thanks for the instructable ;-)

Happy that you liked it! ;-)

Thank you Patel! :-D

You're welcome! :-) Hope that he'll appreciate! :-)