Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 X-Band Motion Detector ( 32213) The X-Band Motion Detector is a common ingredient in security systems and automatic door openers, and can detect movements in a room, yard, or even on the other side of a wall. Its a Doppler radar sensor that operates in the X-band frequency at 10.525 GHz, and indicates movements with oscillations in its high/low output. Sensitivity is manually adjustable with a potentiometer on the back of the device, offering direct line of sight detection from roughly 8 to slightly over 30 ft (~2.4 to 9+ m). Features y Operation frequency of 10.525 GHz y Able to detect motion through walls and windows y More immune to false triggers than passive infrared motion sensors y Active-high enable pin with internal pull-up resistor y Trim potentiometer on the back for manually adjustable sensitivity y 4-Pin SIP header for breadboard or through-hole prototyping y Built-in series resistor for compatibility with the Propeller microcontroller and other 3.3 V devices y Plated test point hole for monitoring pre-comparator signal Key Specifications Power supply requirements: regulated 5 VDC, 8 mA y y Communication: High (3.9 V) / low (0 V) signal oscillates with motion y Dimensions: 1.83 x 1.87 x 0.69 in (46.5 x 47.5 x 17.6 mm) y Operating temp range: 32 to 131 F (0 to 55 C) Application Ideas y Security systems y Automatic door openers y Automatic lighting y Nuisance animal deterrence Front Back (Antenna side) (Potentiometer side) Copyright Parallax Inc. X-Band Motion Detector ( 32213) v1.1 11/9/2009 Page 1 of 8 Quick Start Motion in the detection area causes oscillations at the modules OUT pin, which can be detected by a microcontroller. The front of the device is the antenna PCB, a printed circuit board surface with the modules transmit and receive antennas, as shown in Figure 1. The device should be oriented so that this surface faces the detection area. When the enable (EN) pin is held high or left floating, the device takes brief, periodic, low power Doppler radar measurements. The frequency of the high/low signals the output (OUT) pin transmits corresponds to the speed of the motion. Figure 1: Antenna PCB Orientation and Signaling + 5 V IF +5V EN OUT GND Test Circuit Figure 2 shows a test circuit for either the BASIC Stamp 2 or Propeller microcontrollers. The optional enable (EN) pin is connected to I/O pin P9, and the modules output signal (OUT) pin is connected to P8. The EN pin can be held low to disable the device. When the EN pin is pulled high it enables the device. Likewise, if the EN pin is left floating, an internal pull-up resistor keeps the device enabled whenever it has power. The OUT pin oscillates whenever motion is detected, and in general, the more motion, the faster the oscillations. Figure 2: Test circuit schematic NOTES: For most Parallax BASIC Stamp carrier boards, the +5V connection is labeled Vdd, and the ground (GND) connection is labeled Vss. For most Parallax Propeller carrier boards, the +5V connection is labeled 5V, and the +5V ground connection is either labeled GND or P9 Vss. P8 GND Copyright Parallax Inc. X-Band Motion Detector ( 32213) v1.1 11/9/2009 Page 2 of 8