How PIR Motion Sensors Work -- The Learning Circuit 81

Great introduction. Just the right level of details to pique my interest. I have used them but never really spent any time understanding them.

You can bake with the solar oven, but it is very tough to control the heat.

You have to rotate the baking dish so that you get uniform heating.

DAB

Be careful, if what you cook splatters, you can get stuff on the lens.

Also be careful with the focus, it does not take a very large focus circle to generate a lot of heat in a small area.

Great if you are making charcoal, not so great if you actually want to eat what you cook.

DAB

I always wanted to try to build a solar oven, but was never able to get my hands on a lens that big! I think I remember seeing someone, like, properly baking with one. THAT would be something to see!

Solar cookers are fun! I have an old projection tv screen I salvaged that's waiting for spring, when the sun comes out more often here in the midwest. Don't know what I'm gonna "cook", but it's gonna be fun!

Great primer on PIR, Karen!

When I was a kid, I had this science activity book that contained a page that was a Fresnel lens with instructions on using it to cook hot dogs--and a stern warning not to cook anything else!

Ok , thanks , I'll keep you updated !

Hello - I sent out the stickers a few weeks ago. Via regular mail. Please Let me know when you receive them.

Hi, I cannot send a message to you, because I get this error: "You can only send messages to your Contacts / Connections (people following you). You must remove users marked with an exclamation point before your message can be sent."

Please direct message me on the community with your address and I will send you some stickers.