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There's plenty of options on ebay, you will have to add a DC motor driver and optionally, sensors, but these are a good starting point.

If what you want is to tell apart 2 devices that are basically identical, you have 2 ways: always plug them in the same ports and use the USB tree to differentiate them create an handshake protocol, …

yes, you can, this is what happens normally in a crowded area where multiple people use their phones with bluetooth headsets, for example. if you believe the claims typical 10m max 100m but in practi …

The digital output pin cannot output sufficient current to drive the relay directly. Iirc this question was already asked. You need to add between the Arduino and the relay a driving stage, for exampl …

Did you try with lsusb and dmesg? They should show if the Arduino was detected and what are its parameters (use lsusb -v for more detailed info). If it is detected but you do not get the correspondi …

Most likely you will have to add at least some pullup/pulldown resistor. I would recommend having a look at the schematics of the shield. For example this shield: http://freematics.com/store/index.php …

If you have access to an AVR ICE MKII or an AVRDragon, you could try High Voltage programming. It is, AFAIK, the ultimate way to revive a bricked device. There might be some alternative method to perf …

The titles of the graphs are actually saying what happens: the hysteresis. In other words: if the input level is high (greater than 2.6V), it will be considered high through the hysteresis area (un …

your code is ridden with html tags, like </p> <p> or </liquidcrystal.h></newping.h> Try removing them all, but it would be better if you could copy it from a plain ASCII source. And when reporting …