Precise distance measurement using ultrasonic sensor (HC-SR04) and Arduino

  • Status: Closed
  • Prize: $20
  • Entries Received: 5

Contest Brief

The challenge:
Measure the distance using the ultrasonic distance sensor after a trigger signal. Send the result through the serial port (Baudrate: 115200, 8 databit, No parity, 1 stopbit) within 200[ms] (so the result must arrive within 200[ms] after the trigger), each result must arrive in a new line. The result must arrive as string rounded to 2 decimal places.
If the result do not arrive in 200[ms] after the trigger then a 0 will be recorded in its place. All the provided sensors can be used. The trigger signal is a high-low-high transition with 10[ms] low time.

How to participate:
Send the hex file of your code to us: ingaelearn (at) [login to view URL] or share your link in the description of your submission. You can send maximum 3 submissions per user (3 HEX files). You have to select your final submission.

An object will be set to different distances from the distance sensor, the output of your code will be recorded. We will test each HEX once during the submission period and once after closing the submission period with a slightly different measurement setup.
The score will be calculated with the Mean Squared Error using the ground truth, the lower the better.

The participant with the lowest Mean Squared Error result will be in the first place. In this case you have to share your source code with us to win the prize.


The hardware setup:
Name Type Pin configuration

Arduino Uno Rev. 3 SERIAL RX: PIN0

Temp. & hum. sensor DHT11 SIGNAL: PIN2

Distance sensor HC-SR04 TRIG: PIN13

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Public Clarification Board

  • collaborart
    Contest Holder
    • 5 hours ago

    Thank you for your participation! I see that the description of the contest was not clear and I could not maintain the contest properly. So I decided to wait for the end of the award period where you will get the prize evenly distributed among you.

    • 5 hours ago
  • patrickwagner068
    • 1 month ago

    What do you mean by "high-low-high" transition ?
    Do you want the signal to be triggered on logic level or signal edge ?
    Should it trigger from high to low or low to high ?

    What do you mean by rounding to 2 decimal places? Which unit ?
    Should the String only contain the number or the unit and elapsed time as well ?

    How do you want exceptions to be handled ?
    The HC-SR04 operates between 2cm and 4m, what should happen, when a result is outside this range ?

    • 1 month ago
  • tonnyboy
    • 1 month ago

    I have a problem while submiting work please check the link

    • 1 month ago
  • Abelk020
    • 1 month ago

    Is the wiring connection flexible, i mean can the external trigger pin which gives high low high signal be connected to pin 3.

    • 1 month ago
  • Abelk020
    • 1 month ago

    "If the result do not arrive in 200[ms] after the trigger then a 0 will be recorded in its place." Can you please elaborate.?

    • 1 month ago
  • i2eng
    • 1 month ago

    Hello! Do you need the code for the DHT11 too?

    • 1 month ago
    1. collaborart
      Contest Holder
      • 1 month ago

      The DHT11 is only for temperature calibration if you need.

      • 1 month ago
  • collaborart
    Contest Holder
    • 1 month ago

    If you have any questions feel free to ask!

    • 1 month ago

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