Parking sensor circuit

Description.

This simple circuit can be used as an aid for sensing the distance between the rear bumper of the car and any obstacle behind the car. The distance can be understood from the combination of the LEDs (D5 to D7) glowing. At 25cm D7 will glow, at 20 cm D7&D6 will glow and at 5cm D7, D6 and D5 will glow. When the obstacle is beyond 25 cm none of the above LEDs will glow.

Two ICs are used in the circuit. The IC1 (NE555) is wired as an astable multivibrator for driving the IR Diode D1 to emit IR pulses. The operating frequency of the transmitter is set to be 120Hz.The IR pulses transmitted by D1 will be reflected by the obstacle and received by the D2 (IR photo diode).The received signal will be amplified by IC2a.The peak of the amplified signal will be detected by the diode D4 and capacitor C4.R5 and R6 compensates the forward voltage drop of D4.The output voltage of the peak detector will be proportional to the distance between car’s bumper and obstacle. The output of peak detector is given to the inputs of the other three comparators IC2b,IC2c and IC2d inside the IC2 (LM324).The comparators switch the status LEDs according to the input voltage their inverting inputs and reference voltages at their non inverting inputs. Resistances R7 to R10 are used to set the reference voltages for the comparators.

Circuit diagram with Parts list.

parking-_sensor-_receiver-_circuit.JPG

 

parking-sensor-_transmitter.JPG


Notes.

  • Assemble the circuit on a good quality PCB or common board.
  • The D1 & D2 must be mounted close (~2cm) to each other, looking in same direction.
  • The D1 can be a general purpose IR LED.
  • The D2 can be general purpose IR photo diode with sun filter.
  • The transmitter as well as receiver can be powered from the car battery.
  • For proper working of the circuit, some trial and error is needed with the position of D1 and D2 on the dash board.
  • All capacitors must be rated 25V.
  • The ICs must be mounted on holders.
Show Comments

139 thoughts on “Parking sensor circuit

  1. aarathana

    Hi sir,we doing this as our final year project…Need more information about PCB layout, requiring components and working…how to install it on a actual vechicle ….can you please send those details to my mail and it will very helpful for us…thank you

    Reply
  2. Akshay

    Hello, Sir I m using things topic for my mini project but I have issue with the output can u please send me the full article?

    Thankyou

    Reply
  3. M.ABDUR RAHMAN

    hellow sir,should i use only a 12v source for it or shall i use 9v source….and i also have another prblm,once after connecting the receiver circuit all my LED glows,even when transmitter is swicthed off…what may be my prblm????

    Reply
  4. Attiq

    This circuit works perfectly with some modifications. However this circuit is not suitable for reverse parking because the IRs are reflected in Daylight if you adjust it for daytime then for night you have to adjust the sensitivity again. It will be better if you use ultrasonic Sensors.

    Reply
  5. Sanjyot kajale

    Sir,
    I have taken the above circuit for my mini project.
    I hope that the circuit works…
    can u please send me the details of the circuit, it’s working and pcb schematics..?
    I badly need them…urgently
    my mail id is as above
    please send the details…

    Reply
    • AA

      Hi Seetharaman,

      I built the circuit on breadboard and discovered the the 555 timer had low current output to I had to amplify it using a transistor it did work, was wondering what you thoughts are about this?

      Kind reagrds,
      AA

      Reply
  6. Smita Kapoor

    Sir,
    I have taken the above circuit for my mini project.
    I hope that the circuit works…
    can u please send me the details of the circuit, it’s working and pcb schematics..?
    I badly need them…urgently
    my mail id is as above
    please send the details…

    Reply
  7. Seetharaman

    Yes you can mount ensure the sensors are isolated properly. Transmitter and receiver can be at either extreme of the PCB such that they do not interact in the PCB itself. Take care in the layout.

    Reply
  8. Roshan Zameer

    Sir this circuit is great concept wise but i m new to these aspects…i have made simple portable mobile chargers but this circuit seems complicated but i want it to be done the best…

    Reply
  9. Jaison Joseph

    sir,
    I am new in this field its very hard to fix components in breadboard referring the above circuit.
    so pls can u help me
    a video would also be very helpful.
    any ideas how i could change the circuit to be as i want it !! reply as soon as possible plz!!
    thanks alot in advance…..

    Reply
  10. aSHu

    please let me know if there is any circuit which will produce a warning tone inside the car when the car speeds to 100km/h.
    Thanks
    -aSHu.

    Reply
  11. Farokh Kavas

    Dear Mr.Sitharaman,
    Your design circuit is responding well if it is properly installed
    in a car. I also installed D1,D2 on front bumper with few modifications
    as it is use-full during heavy rush hours in a country like India.
    All the Best.

    Reply
    • David Markus

      Farokh Kavas or anybody else(who tried this circuit),
      I am bit confused with the mounting of transmitter circuit and receiver circuit. How they both will connect to each other and which ports or pins to connect. As per understanding, Transmitter will be installed on front or rear bumper and the receiver circuit should be installed somewhere inside car – on dashboard to be visible to driver.

      Please help (URGENT).
      Best!!!

      Reply
  12. manmeet

    sir,
    could you plss send me the layout and all the neccessary details.. this would be my firt project and i want it to be the best.. but problem is that i am raw and i dont knw much about the things.. i will be vry thankfull if you could be a help..

    Reply
      • A. Gonzalez

        Hi Mr Seetharaman,

        This circuit does not work well.
        I designed the PCB mounted and assembled it. Emitter section generates a signal but is not detected at the input of Receiver section so the unit does not operate as expected. If you want more info you can email me kosmosxxxx@gmail.com
        Kind regards

        Reply
      • Jaison Joseph

        sir,
        I am new in this field its very hard to fix components in breadboard referring the above circuit.
        So pls can u help me
        A video would also be very helpful.
        Any ideas how I could change the circuit to be as i want it !! reply as soon as possible plz!!
        Thanks alot in advance…..

        Reply
  13. Brandon Cooper

    I’ve set out this circuit on Eagle CAD, I tested it and it works 100%

    If anyone wants the layout replay whit your email address

    I made two, one with LED’s and another with a Pizo buzzer.

    This is possible because of Seetharaman,
    Brandon Cooper

    Reply
  14. happy

    sir as you said that the electronics are kept in the car driver panel.. means only ir transmitter and ir receiver is mounted on rear bumper, and all other circuitary is in driver panel… is it so???

    Reply
  15. happy

    sir as you said that the electronics are kept in the car driver panel.. means only ir transmitter and ir receiver is mounted on rear bumper, and all other circuitary is in driver panel… is it so???

    Reply

    Reply
  16. swara

    as the IR photodetector use is not detecting the signal our project is not working properly.wht would b d possible ways to done it?n tell me one thing that the obstacle should some reflective surface like metal or mirror?

    Reply
  17. happy

    sir can u please send the total working detail of this circuit?? its urgent…
    i have made this circuit on pcb.. but i dont know why, it is not working…..:(

    Reply
    • Seetharaman

      Hi happy this works on the received Infrared signal level. The parking sensor transmitter transmits the IR signal which is received, while some close obstacle reflects back the IR signal. The receiver receives as per the signal level received the LEDs glow. Closer the obstacle all the LEds D5, D6, D7 will glow. As the obstacle is moving away little D5 will extinguish if moves away further D6 also will extinguish if it moves further all the will extinguish. Both the transmitters and receiver sensors are mounted on the rear bumper. The electronics are kept in the car drivers panel and can be energised by the car battery when the car is reversing.

      Reply
      • happy

        sir as you said that the electronics are kept in the car driver panel.. means only ir transmitter and ir receiver is mounted on rear bumper, and all other circuitary is in driver panel… is it so???

        Reply
  18. Dave

    How would i be able to increase the range of the IR LED or the photo diode so i could detect obstacles at something like 50cm?

    Reply
  19. robert

    my back up sensor fails whe my trailer harness is installed, harness not in use, but after a time the sensor fails to operate when i unhook the trailer harnes the sensor wil work any suggestions

    Reply
  20. arpit

    sir, can you please send me the following about the parking sensor circuit???
    pcb layout
    circuit schematics
    block diagram
    component specifications
    i will be very thankful as i require this for my final year project.

    Reply
  21. Peter

    hehe, sorry forgot to mention this.

    laser light is coherent, so as for only a single small dot being reflected back, so maybe use some special concave type lens or something in front of laser, to better the chances that the photodiode can detect it.

    Reply
  22. Peter

    This circuit I think will work, except for the viewing angle problems(ie setting it up), and further intensifying the exposure(IR)

    But knowing the viewing angles, 60-120 or so degrees will work I believe.

    But, what I`d rather do, is use the ir laser diode from a dvd burner, and use some driver circuitry for it, like the 555 used here, doing some modulation. I just believe the ir laser will be better equipped as for intensity.

    Well, just my thoughts.

    Reply
  23. mohsin

    it is good circuit, but i would like to know how to install is on actual vehicle ? i hope u will satisfied me with a proper answer

    Reply
  24. sagar

    what if i placed the parking circuit at a point in rear bumper of my car & on parking there is a pole behind my car, not in alingnment of the LEDs, than the circuit will not detect any obstacle…….so how can i use it on full width of my car…..plz ans on my email..

    Reply
  25. layal

    hi sir
    i am a student in the lebanses university and i really wana know how to build this thing and put it on a gadget but plus i need instead of glowing on the last 5 mins i want it to change side or to just block in its place !! any ideas how i could change the circuit to be as i want it !! reply as soon as possible plz!!
    please mail me the required—-> layal_ghossein@hotmail.com
    thanks alot in advance

    Reply
  26. Senn

    Hello,
    can i know how can the transmitter and the receiver can be place? i have problem to place the two circuit together. besides, i want to know further details about this project. Please mail me the required –> sen92.capricorn@gmail.com
    thank you.

    Reply
  27. Senn

    Sir,
    I’m a beginner and i want to know the more details on this project.Can i know how am i suppose build the receiver and transmitter? and a video would also be helpful to do this project.. Thanks.. please send me email about this project details.. –> sen92.capricorn@gmail.com
    once again, thank you..

    Reply
  28. abhishek

    Sir,
    Could you please mail me the details of the project? i am a beginner and was wondering how exactly do the leds respond to change in proximity of the obstacle. could you explain how to implement the above on a bread board? how am i supposed to place the transmitter and receiver. i tried building them separately on two different breadboards but the receiver doesn’t detect anythng. i shall be extremely grateful if you could help me out.

    Thank you.

    Reply
  29. Edgardo

    Hi Seetharaman,
    Good day,
    Just to follow up this request/inquiry dated Jan.24, 2012,
    as quoted;
    How can I determine the exact distance of the sensor,meaning; from the dashboard to the rear bumper and to any obstacle at the rear of the car.
    From the sensor at the dashboard, and to the rear bumper of the car, how many centimeters total all in all?
    Thanks .

    Reply
  30. Edgardo

    Hi Seetharaman,
    How can I determine the exact distance of the sensor,meaning; from the dashboard to the rear bumper and to any obstacle at the rear of the car.
    From the sensor at the dashboard, and to the rear bumper of the car, how many centimeters total all in all?
    Thanks .

    Reply
  31. seetharaman

    Hi Jason you need not be very specific about the frequency as this project only senses the level of IR signal received. Not compatible with Ultrasonic sensors you require modifications in both transmitter and receiver circuit.

    Reply
  32. jason

    hi i m using this circuit as my school project but i cant get a 40khz pulse from the 555 timer n i change twice the 55 ic d still i dont get a stable 40khz pulse may i noe y?

    Reply
  33. chirag

    hey this project required any programming part….,& please give me component list of this project please it’s urgent for me please……….

    Reply
  34. Elsie

    Sir,could you please send me also the block diagrams and all details of these project,appreciably with an audio buzzer instead of LED?
    Thank you so much!

    Reply
  35. Lesman

    Everyone wants the audio version of the circuit. The mods needed are very simple. The buzzer can be driven from the 3 lm324 outputs as long as the buzzer current needs are not greater than the output of the lm324. Care must be taken not to over tax the output. Use different resistor sizes to change the ma of current to the buzzer. It will progressively get louder if you start with larger values and decrease the values as you go. Use Ohms law for resistor values. If needed, a transistor hooked from the output can drive larger milliamps to the buzzer. Some buzzers even have two inputs that can be driven. One that pulses and one that is steady. You could increase the sound then pulse when maximum range is reached. A little research and creativity will make the circuit do wonders. Good luck.

    Reply
  36. seetharaman

    Hi Testpen Mount the electronics in the car, place both the sensors as per notes.
    The D1 & D2 must be mounted close (~2cm) to each other, looking in same direction.
    The D1 can be a general purpose IR LED.
    The D2 can be general purpose IR photo diode with sun filter.
    The circuit will definitely work.

    Reply
  37. Testpen

    Hi! I had try your diagram but still don’t know how to get the true operation. Can you show me how to arrange the D1&D2? Can i use ultrasonic transducer?

    Reply
  38. ashish

    this site is very good in others comparision but please help me i nee a circuit of wirless rc car with forward and backward 100feet rc range and high speed operated with 9vlt battery if you can do this i will say you excellent tag that circui in your website thankyou

    Reply
  39. kyriakos triantafyllidis

    Dear Sir,
    Please send the shematic of the PARKING SSENSOR CIRCUIT
    with an audio buzzer instead of LEDS.
    Thanks in advance
    Kriakos from Athens

    Reply
  40. nithin

    sir,could you please send the details,block diagrams and all details of the sensor,appreciably with an audio buzzer instead of LED s,

    Reply
  41. christoffer

    sir admin..can i also have a full copy of this article..
    its my project for may last subject..and i can’t finish it.
    i can’t make it work.i’m confuse about the parts..like the sun filter,and photo diode..here’s my e-mail add. x0xo_x0xo@yahoo.com

    -thank you so much sir admin.

    Reply
  42. monika

    i have to make project on this topic…….
    plz tell me about how much cost its make……..plz rply as soon as possible

    Reply
  43. Badeekh

    Hi JoySankar, i have transferred energy using laser beam in one of my project, even we could communicate through it, i will search if i still had its diagram,
    anywaz if u r intrstd cntct me Badeekh@yahoo.com

    Reply
  44. Badeekh

    hey Peter Davidson, i got ur conserning one, reversing parking buzzer, but problem is that i cudnnt adjust its sensitivity, anyhow u can make it ur self, cntct at Badeekh@yahoo.com
    Admin
    i got the sheild from a scrap vcd… thx:-)

    Reply
  45. seetharaman

    Hi Patience Karemera hope you are enjoying by assembling and using it successfully. try whenever possible the circuits appearing in Circuitstoday, they are all tested circuits you will find them useful and also will give immense happiness by the results after assembling them.

    Reply
  46. Patience KAREMERA

    This circuit is interested because it have been appreciated by every one who has seen it AND i am happy to know it.

    Reply
  47. mwadime kevin

    hi, iam doing this project for my final year, could you plz send me the block diagram and any material concerning this project, i will be so grateful. my email is kmbeke@gmail.com

    Reply
  48. MODEE

    i am a student of EEE. pls describe the photo diode and the sun filter. pls i was choked up at that stage. and how does the transmiter work.

    Reply
  49. koech hillary

    could you please send me the following about aparking sensor:
    circuit schematics
    block diagram
    component specifications
    i will be very gratful as i require the same for my final year project

    Reply
  50. Smady

    Can any1 pls design the same having an automatic braking system if d car reaches a specific distance near to d object????

    Reply
  51. seetharaman

    Hi Richa in my openion you cannot use a capacitor with lower voltage ones, rated voltage is good. higher voltage capacitors can be used sucessfully, but on the long run they may get dried up earlier than the rated ones.

    Reply
  52. Joysankar Bhattacharjee

    I am student of B.Tech Electronics and Communication Engineering student.We are making a project on Wireless Energy Tranfer. So if it possible on your part to provide us some information along with the circuit diagrams,please help us in making our project.Thanks

    Reply
  53. twits4twats

    Any updates on the buzzer version of this?
    Has anyone done it? I’m interested..

    All

    In case anybody missed it, this circuit activates LED’s instead of the customary audio buzzer that one is used to hearing in cars. And normally the closer you get to the obstacle the more persistant the buzzer becomes. This circuit activates an LED and then the longer the obstacle is present depends on when the 2nd LED swithes on and then the 3rd. Allthough this circuit will work I don’t think it is pratical for when somebody is reversing and looking into their mirrors. It needs conversion to audio.

    Reply
  54. kartheek

    can u give still more explanetion on this parking circuit sensor plzz.how can we check the output after assembling the circuit.

    Reply
    • admin Post author

      miniature sun filter sheets are available in the market. You can use a dark cellophane paper or a piece of X ray film for the purpose.
      The best source to get a sun filter is your old VCR with remote. Most probably there will be a filter covering its IR sensor.

      Reply
    • admin Post author

      At the moment I am not designing PCBs for readers. But I am seriously thinking on it.
      You can easily design PCbs by yourself using softwares like PCB123, Eagle PCB etc.

      Reply
  55. Peter Davidson

    could you design a reversing Parking sensor circuit with a buzzer/alrm whennear object. it is for a school project i have to do for very soon.

    thanks

    Reply
  56. Sydney Airport Parking

    Parking is a problem at airports and in Australia the airports are owned by the Airport Corporation. They effectively have a monopoly on parking at the airport. What some enterprising individuals have done is sell parking spaces close to the airport and offer a free shuttle service to the terminal. This can be very cost effective and is really taking off in Australia.

    Reply

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