Troy
USA
Asked
— Edited
[EDIT] In this thread, there may be broken links as time goes on. The purpose of the posts is to give members ideas to build on and be a repository for other people to add to as well. Happy building! Oh, let me add that I have no affliation to any seller or company. Always check out your suppliers before handing over your hard earned cash.
Well its new to me. I can see it now. "Dave, there seems to be an approaching storm. It's time to stop our soccer game and get inside"
eBay Link, Datasheet Link
Franklin Lightning Sensor provides early warning indication of lightning storm activity within a 40km range
- Provides distance estimation to the head of the storm
- Detects both cloud-to-ground and intra-cloud (cloud-to-cloud) ashes
- Intelligent algorithm provides for false disturber rejection
- Programmable detection levels enable threshold setting for optimal con gurability
- SPI and I2C interface is used for control and register reading
- Automatic antenna tuning
- Supply voltage range 2.4 to 5.5V
- Power-down, listening and active mode
Here is another one for motion detection for up to 20 meters. eek Microwave Doppler Radar Motion Sensor
Edit: see post #6 for better one.
UPDATE: Here is another lightning detector that popped up. eBay Link
Thanks Troy! I am always eager to discover what new /odd sensor you find and post
I think the one I am waiting for is the female hormone sensor so you k now when to run or when to cuddle
:D I'm afraid you have to rely on your experience and wisdom for that!
"Old too soon smart too late"
I suppose it will have to remain one of life' s mystery's 
I don't know how I missed this one. It's been around a while.
Dust Sensor
Here's another. Vibration sensor.
Since we are on the topic some robots have Sensors on their finger tips so they can hold a paper cup gently without crushing it does anyone now what sensor do you have to use for that sort of thing
@Mohamed.r LOL your autocorrect really threw me off. I assume you meant "sensors on thier fingertips". It would have to be an extremely sensitive pressure sensor. Have you researched the robot you saw it on? It may list the sensor parts.
Sorry about that I'll edit it in a moment but yes I meant sensors on their finger tips the robot I saw it on was asimo and nao but even if you are making a robot with claws you can put pressure sensors on the claw so if you tell it to hold something fragile it will not crush it
How about this one? It looks small enough.
Technical Specifications:
Active area : 5mm Circle x 38mm Actuation Force: ~0.2N min Force Sensitivity Range: ~0.2N - 20N Ideal Operating range (90% or more of resistance change occurs between):10gf ~ 1.0kg (0lbs ~ 2.2lbs)
Force/pressure sensor