18-06-2011, 01:37 PM
28-03-2012, 04:59 PM
full report of the project ULTRASONIC PROXIMITY DETECTOR has been published in the page
Reference: https://seminarproject.net/Thread-ultras...y-detector
23-11-2012, 06:29 PM
Ultrasonic Proximity Detector. Ultrasonic Proximity.docx (Size: 671.89 KB / Downloads: 56) Transmitter U2C forms a 40 KHz oscillator (figure 3 shows the 40 KHz crystal assembly). This oscillator is connected to U2D and U2E while the inverted oscillator signal (U2B) goes to U2A and U2F. These parallel gates provide more current and drive the ultrasonic transmitter. Note that it may take a couple of seconds after the power is applied for the oscillator to stabilize. Receiver Q1 and Q2 amplify the reflected 40 KHz signal picked up by the ultrasonic receiver by 2500. Q2 is capacitively coupled to the voltage doubler formed by D1 and D2. The rectified signal is connected to the negative input of voltage comparator U1A. R12 (the Sensitivity potentiometer) sets the threshold voltage for U1A. When the threshold voltage is exceeded, the open collector output of U1A goes high-impedance. This enables the 70 Hz oscillator formed by U1B. When this oscillator is on, the LED glows and the one-shot formed by U3 is repeatedly triggered. The output duration of the one-shot is set by R16 and C11 and is equal to 1.1*R16*C11 seconds. U3's output turns on Q3. As a result, K1 closes its normally open contacts. C13 dampens the inductive kickback when K1 is turned off, preventing the circuit from triggering due to this noise source. The unit is powered by a 12 VDC 200mA unregulated wall transformer. U4 provides a regulated 9VDC to power the circuit. Device pinouts are shown in Figure 2. The 40 KHz transmitter and receiver are mounted 4 inches apart on a piece of perfboard (see Photo 2 below). |
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