Microwave motion sensor is a kind of sensor that utilizes the Doppler effect to detect moving objects. It features low current consumption, high temperature stability, high sensitivity and flat profile, making it an ideal low-cost motion detector.
The SW100 is an X-band microwave Doppler motion sensor module from SUNSTAR. The manual explains how to wire the module's +5V, GND and IF (signal) terminals, how to orient the antenna face toward the area to be covered, and the three signal types provided at the IF output: Doppler shift, noise, and a DC level.
It also describes the module's characteristics and uses — low power consumption, pulse or CW operation, security systems and automatic door controls — gives the Doppler frequency formula with a worked example, and includes two amplifier circuit annexes for CW and pulse operation. This manual is written in Chinese.
| Transmit frequency (Ft) | 10.525 GHz |
|---|---|
| Pulse operation (Annex 3) | PRF 2 kHz, duty cycle 4% |
| Doppler frequency formula | Fd = 2v(Ft/c)·cosθ |
Three types: Doppler shift at microvolt level when an object moves in the covered area, noise, and a DC level of about 0.1 V whose polarity can be positive or negative.
Solder the ports marked on the module: +5V, GND (ground), and IF (signal).