Ultrasonic sensor circuit design

Discussion in 'General Electronics Chat' started by AlCapown3d, Aug 14, 2014.

  1. AlCapown3d

    Thread Starter New Member

    Aug 14, 2014

    I´m trying to design a sensor circuit for this ultrasonic sensor:
    my http://files.voelkner.de/500000-524999/505679-da-01-en-ULTRASCHALL_SENSOR_KPUS_40FS_18R_448.pdf

    This is my current design:

    I use an Arduino Mega 2560 with USB as power supply and serial connection.

    I build a transmitter circuit with 24V supply for transmitter. I use the tone library to feed the gate of the mosfets with 40kHz.

    My problem is that my sensor circuit only receives the signal within a 10cm distance. I want to get to 1m distance and since I try to use this circuit for trilateration I want the circuit to be as time invariant as possible.

    I currently don´t have an oscilloscope. For example I have no idea what C2 does, but without it I receive random noise constantly.
  2. MrChips


    Oct 2, 2009
    It would be difficult to design and trouble-shoot such a system without an oscilloscope.
    It would be like shooting in the dark. You can't see your target or how far off you are from your target.
  3. pwdixon


    Oct 11, 2012
    If you are using an Arduino what was wrong with the standard HC-SR04 ultrasonic sensor people use on Arduino's? They even have a library to process the sensor already.
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    here is an ultrasonic parking aid, use the op amp design for your set up, IC02
    Last edited: Aug 14, 2014