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Messing around with Arduino can lead to some ... A brand new, still-in-the-packaging resistor should have its Ohms value printed out for easy reading, but any resistors that have been unboxed ...
Many of these are based around some sort of Arduino-powered CPU ... or pull the output to ground if it does. Then a pull-up resistor holds the state high if no CPU pulls it to ground.
Much like his pinout programs we talked about previously, these charts show ... incredibly easy to read and a great reference guide when you're first getting started with Arduino.
The device he holds in his hand is an Arduino connected to the OUTSIDE portion ... Once communications are established a 32-bit sitecode can be read from any of the locks and immediately used ...