Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)
Tags: ultrasonic, motion, detector, schematic, ultrasonic motion detector schematic, ultrasonic motion detector schematic ppt, ultrasonic motion detector schematic pdf, ultrasonic motion detector circuit, ultrasonic motion detector project, ultrasonic motion detector circuit diagram, ultrasonic motion detection, ultrasonic motion detector pdf, circuit diagram of ultrasonic motion detector, how ultrasonic motion detector works,
Ask More Info Of  A Seminar Ask More Info Of A Project Post Reply  Follow us on Twitter
29-05-2010, 05:08 PM
Post: #1
ultrasonic motion detector schematic
Ultrasonic motion detectors emit and receive ultrasonic sound energy in a region of interest.Object motion within the region of interest and in the range of the ultrasonic motion sensor is detected and an alarm signal is produced.The range of these detectors differs from the designed range whenever the actual atmospheric sound propogation conditions vary from the atmospheric conditions assumed in the design .Ultrasonic motion detectors are commonly used for automatic door openers and security alarms. ultrasonic beams are easily blocked by thin materials, including paper and as a result False triggering is easly caused by reflections from blowing curtains, pets, and flying insects.

its is a popular device for detecting motion in a free space. it is not as versatile as the passive infra-red type mainly due to its restricted range, usually only about 9 meters max. It can be used in situations and environments which mould be unsuitable for the infra-red type as it is not affected by temperature chances.The human ear can hear sounds of frequencies between 20Hz and 20KHz (20,000Hz). Sound waves do exist above 20KHz but me cannot hear them, these very high sounds are called ultrasounds or ultrasonics. Imagine you are standing in a street and a police car or some other emergency service vehicle is speeding towards you. As it passes the sound of the siren seems to change. The reason tor this is because sound waves travel at a finite speed (700mph approx) regardless of the speed of the sound source. In effect as the source moves towards you the sound waves are compressed and sound higher, on the other hand, as the source moves away the sound waves are expanded and sound lower. This phenomenon is known as the Doppler Effect after the person who first discovered it in 1845.
The wiring of motion detectors is a relatively easy task as you can see below. The diagram shows a unit with the cover removed to reveal a terminal block for the connections to the control panel. These consist of:
1. A Normally Closed Alarm Relay. When the detector is stable (no movement) then this relay is closed. This is connected to the appropriate alarm zone at the panel and hence the alarm loop will be closed. If however the detector senses movement then it will open this relay for approximately 5 seconds after which it will reset itself.
2. A Tamper Switch Output. This is closed until the cover is removed and is connected to the tamper circuit at the control panel.
3. 12VDC Supply Terminals. These detectors require a 12Volt supply from the panel.

Circuit description
The circuit uses a matched pair of 40 kHz transducer elements to detect movement up to 22 feet away. Crystal locked circuit for maximum stability. An LED is switched on for movement indication. The transmitter sends out a steady ultrasonic signal at 40kHz( wavelength ~= 6 mm).
The reflected sound is detected by ultrasonic receiver. The
signal is then amplified by amplifiers.An amplifier is selfbiasing. The time constant of the first amplifier is set to let the 40kHz signal through. Between
the first & second amplifier there is a negative peak
detector consisting two diodes which follows the envelope of
the 40kHz signal. If there is no movement the envelope is
just a straight line. The time constant ofsecond amplifier is much slower so that it will follow this envelope. When
there is no movement neither diodes can conduct. If the signal falls or rises the diodes conducts which the output to go high. A low pass filter screens out unwanted spurious signals. Specific details about the circuit are available in this link:

you can do modifications
1.can use non-polarized capacitors rather than capacitors which have polarity to avoid the mistakes in polarity can use a 39.270 KHZ crystal rather than a 40 KHZ crystal because exact 40 KHZ crystal is may not available in the market

Please Use Search wisely To Get More Information About A Seminar Or Project Topic
Rating ultrasonic motion detector schematic Options
Share ultrasonic motion detector schematic To Your Friends :- Seminar Topics Bookmark
Post Reply 

Marked Categories : ultrasonic schematic, ultrasonic motion sensor circuit, simple ultrasonic motion detector receiver circuit, circuit of ultrasonic motion detector, ultrasonic motion detector circuit design, materials for ultrasonic movement detector, ultrasonic motion detector circuit diagram, ultrasonic motion detection schematic, ultrasonic circuit design pdf, ultrasonic sound detection and its applications, ultrasonic movement detector alarm circuit diagram, ultrasonic motion detector circuit, detection schematic, ultrasonic movement detector diagram, be projects for instrumentation schematic, pro jects for be instrumentaiton schematic, ultrasonic motion detector ppt,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Non-Blind Detection of Tampering in Images Using Canny Edge Detector jaseelati 0 12 18-09-2014 01:44 PM
Last Post: jaseelati
  Mobile cell phone detector (sniffer) computer science crazy 0 74 13-09-2014 12:08 AM
Last Post: computer science crazy
Last Post: data seminar
  Multi-user Detector For Cdma/wll System presentation Abstract 0 41 21-08-2014 03:04 PM
Last Post: presentation Abstract
  ultrasonic Pest Repellent mkaasees 0 21 21-08-2014 10:44 AM
Last Post: mkaasees
  Ultrasonic Proximity Detector mkaasees 0 38 19-08-2014 04:20 PM
Last Post: mkaasees
  Microcontroller Based Explosive Detector mkaasees 0 32 18-08-2014 10:28 AM
Last Post: mkaasees
  Location Detector & Announcement System mkaasees 0 41 18-08-2014 10:12 AM
Last Post: mkaasees
  Breath Alcohol Detector presentation Abstract 0 44 16-08-2014 04:23 PM
Last Post: presentation Abstract
  Identity Detector & Automatic Toll Controller presentation Abstract 0 41 16-08-2014 04:14 PM
Last Post: presentation Abstract
This Page May Contain What is ultrasonic motion detector schematic And Latest Information/News About ultrasonic motion detector schematic,If Not ...Use Search to get more info about ultrasonic motion detector schematic Or Ask Here