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Microwave Doppler Radar HB100 Motion Detector
This sensor module has been designed as an alternative to the common PIR motion sensors widely used in burglar alarms and security lights. Like the PIR sensor, this sensor also detects only movements within its detection range. But instead of sniffing the black body radiation from a moving person, this sensor uses a “microwave Doppler radar” technique to detect moving objects. When triggered, its TTL-level output (OUT) pin will switch from LOW (0 V) to HIGH (3.3 V) for a finite time (2 to 3 s) before returning to its idle (LOW) state.
- Low current consumption (typical 30 mA)
- CW or pulse operation
- Flat profile
- Long detection range (20 m)
- Supply voltage: between 4.75V and 5.25V
- X-Band frequency: 10.525 GHz
- Minimum Power Output: 13 dBm EIRP
V1.02 Doppler shift - Doppler shift output from IF terminal when movement is detected. The magnitude of the Doppler Shift is proportional to reflection of transmitted energy and is in the range of microvolts (µV). A high gain low frequency amplifier is usually connected to the IF terminal in order to amplify the Doppler shift to a processable level (see Annex 1). Frequency of Doppler shift is proportional to velocity of motion. Typical human walking generates Doppler shift below 100 Hz. Doppler frequency can be calculated by Doppler equation in Annex 4. The Received Signal Strength (RSS) is the voltage measured of the Doppler shift at the IF output. The RSS figure specified in the technical data sheet is level of a 25 Hz Doppler shift, generate from the modulated microwave signal received at the received antenna, The received microwave signal is attenuated to 93 dB below the transmit microwave signal from the transmit antenna of the same unit. The 93dB loss is the total losses combining two ways free space loss (82.4 dB for 30 meters at 10.525 GHz), reflection less and absorption loss of the target, as well as other losses. This RSS figure can be view as an approximation of the output signal strength for a human at 15 meters away walking straight to the module at 1.28 km/hour. Reflection of a human body is varied with the size of the body, clothing, apparels and other environmental factors; RSS measured for two human bodies may vary by 50%. Circuit designer must take note the maximum and minimum Received Signal Strength (RSS) specified in technical data sheet, when designing the amplifier. Sensitive deviation between modules has to be considered when setting amplifier gain or alarm threshold. On-production-line gain adjustment may be necessary if a narrow window for triggering threshold is required. Noise - The noise figure specified in the technical data sheet is the noise measured in an Anechoic chamber, that shield the unit-under-test from external interference, as well as reflection from surfaces. Hence, the figure is only presenting the noise generated by the internal circuit itself. Other than noises generate from internal electronic circuit, in actual applications, other noises may be picked up from surrounding, or other part of the electronic circuit. Specially attention has to be given to the interference pick up from fluorescent light, as the 100/120 Hz noise is closed to the Doppler frequency generated by human movement On and off switching of certain devices (relay, LED, motor, etc.) may generated high magnitude of transient noise at the IF terminal. Careful PCB layout and time masking is necessary to prevent false triggering.
This video tutorial will help you start with the Microwave Doppler Radar HB100 Motion Detector and to connect it with Arduino :