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The sonar Waytronic WT81B003-0202 18m communicates through a standard serial protocol ([https://en.wikipedia.org/wiki/8-N-1 9600/8-N-1]).
Using an Arduino board equipped with an uart port it's possible to test the sonar performance.
The sketch can be found at https://mega.nz/#F!Bo8jHabQ!kwxQR5jFZorFaOLdQKsTdw)
= Datasheet =
The original datasheet is in Chinese, the following version was translated with Google Translate:
<pdf>File:File:WT81B003-0202-datasheet-google-translate-en.pdf</pdf>
