HC-SR501 Passive Infra Red (PIR) motion sensor can be used alone or
with Arduino or other microcontroller. Sensitivity and output on time
can be adjusted by built-in variable resistors.
Working voltage: 5V
Quiescent current: less than 50 ua
Output voltage: 3.3V high, 0V low
Range: 3m to 5m adjustable
Turn on Time: 0.5S to 200S adjustable
Size: 33 x 24 x 25mm.
Price: $3.50