I've been using Elegoos 37 sensor kit for a few weeks now. So it happened that the ultrasonic sensor in my kit was defective. However, I did find the Elegoo service email list at the bottom of the documentation and Elegoo was very responsive to my questions, agreeing to replace the faulty sensor, and gave me helpful suggestions when I submitted a question about one of the other sensors. I'm slowly getting used to all the items in the set. The use of English in the documentation on the CD could have been better. Even if Arduino sketches are copied from the PDF documentation, there are no line breaks in the Arduino IDE and you need to review and reformat the sketch. This is a little annoying, but makes the user more aware of the code. Overall I think this kit is a great deal and I regret not buying it when I first became interested in Arduino a few years ago. Toptechboy.com has an excellent set of Arduino tutorials by Paul McWhorter, and many of these tutorials use Elegoo sensors.
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