Directions for assembling the Event Detector.
This devices lights an LED when something happens. The LED "latches on" that is, it stays on. You could use this device to determine if an animal walked through your yard during the night or if someone entered your room while you were away. To do this you would tie a string to the trigger blocks and stretch the string across your yard or room, if something walks through the string they will pull out the trigger blocks turning the LED on.
You could use this device to flash on when a race car crosses the finish line - like we have done here with a Hot Wheels track.
The car is at the top of the track ready to go. The event detector is set.
At the end of the track this hot wheels car knocked the trigger blocks over, turning on the LED.