Learn about electronic motion detectors with this
deluxe kit that includes a high-quality enclosure with a mounting
bracket. The motion detector makes a loud, doorbell-like
"ding-dong" sound when it detects motion. The kit is based on
a pyro-electric infrared (PIR) sensor, which is a unique sensor that you
can use to give your projects the ability to react to your presence.
The instructions include several pages of
explanation that describe the various parts of the circuit and how the
PIR sensor works. A 9V battery is required but not included.
Note: The Elenco motion detector is a kit;
assembly is required. This kit requires soldering. A 9V battery is
required but not included.