With a Windows tablet, Arduino, and HC-SR04, you can create a graphical caliper to show the distance.
by Philip Ushijima
Other than a Windows PC, USB cable and Arduino, here's a no cost approach to doing graphically rich, interactive demos for the Arduino.
An Arduino library that abstracts away all the complexity of a CRC based serial communication protocol into a single variable assignment.
Brian, thanks for the hack. I'll give it a try.
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