Ultrasonic Proximity Detector

Posted on Feb 5, 2014

The circuit in Figure 1a and Figure 1b are the schematics of an ultrasonic proximity detector. It has a maximum detection range of approximately 6 ft. When someone passes in front of the ultrasonic transceiver board, the contacts of relay K1 will close. The relay will remain energized while the device continues to detect a reflection. When there is no

Ultrasonic Proximity Detector
Click here to download the full size of the above Circuit.

reflection, the relay contacts will open after 20 seconds. Photo 1 shows the assembled circuit on an experimenter`s breadboard. 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. 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...

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Electronic Night Light
    NiCad Charger with temp control
    On-off controller
    Simple audio mixer circuit with fet 2n3819
    CD4013 Push Button CMOS Toggle Flip Flop
    switch mode power supply What does frequency foldback do in a switching regulator
    auto changeover from generator to mains
    Remote Control Circuit Through RF Without Microcontroller
    IR Remote Control Extender circuit diagrams
    6V6 6J5 Class A Vacuum Tube (Valve) Amplifier Circuit
    60W Linear amplifier
    Low Noise Design Schematics
    300W Valve RF Transmitter circuit