Mobile Robot Follower using ultrasonic sensor

Discussion in 'The Projects Forum' started by Dale Grana, Feb 3, 2016.

  1. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
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    Good evening!

    Can someone help me with my project?

    I've been testing the ultrasonic transmitter and receiver using the breadboard for the past week. I have been trying to test the output from the transmitter and have varying frequencies. Sometimes it goes to MHz and Khz and sometimes has frequencies even if i did not introduce a source when testing the components in the breadboard, and this applies to the receiver as well.

    Here are the circuits courtesy of pocketmagic from his project.

    RECEIVER
    [​IMG]

    TRANSMITTER
    [​IMG]

    Hopefully there will be quick responses since it would really help me a lot if i could achieve this ahead of time :(

    Thank You in advance!
     
  2. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    Breadboard acts as an antenna introducing all kinds of noise and interference. You should build the thing on protoboard.
     
  3. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
    9
    0
    Sir do you know which part of the receiver circuit should I connect the probe into to test the received signal? And are there any settings in the oscilloscope that I should consider?
     
  4. ISB123

    Well-Known Member

    May 21, 2014
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    Transmitter probe goes in J2.
    Receiver probe goes in that symbol on far left which I guess is microphone.
     
  5. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
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    Sir I have a video here from the same author of the circuit, he connects his probes in the transistor and to the output pins. Does that mean that I should connect the probe in the output pin in the middle in J2? or the source pin also in J2 (which is the first pin) ?

     
  6. ISB123

    Well-Known Member

    May 21, 2014
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    527
    Yes,You should.
    His circuit doesn't look like the schematics you posted.
     
  7. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
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    Actually he's using a the same transmitter but with different oscillators. The receiver is just the same as well.
    I don't know why he doesn't use the ground probe, any explanation for this?
     
  8. ISB123

    Well-Known Member

    May 21, 2014
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    He is using ground probe its connected to RX board.
     
  9. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
    9
    0
    Ah, I thought you should connect the ground probe to the ground part of the circuit all the time.

    Thanks a lot!
     
  10. ISB123

    Well-Known Member

    May 21, 2014
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    527
    You should,he is probably connecting the probe to trace that is under the board.
     
  11. Dale Grana

    Thread Starter New Member

    Feb 3, 2016
    9
    0
    Sir I replaced the 2n3904 with Bc548 transistor. Both of them heats up after being supplied for a while, is this normal? or should I apply a heat sink?

    I already have achieved in receiving the transmitted signal but different wavelength with the posted video above :)
     
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