The test equipment
In order to test the alarm system board, you will need the following two pieces of lab equipment:
A variable dual power supply capable of supplying up to 15V and about 2 amps. The supply should also have current limiting.
A multimeter capable of measuring up to about 15V DC supply with a milliamp scale as well.
Both of these are readily available on eBay and elsewhere. My local hardware store regularly sells multimeters for about $20.
If you don't have or can't afford a variable power supply, use AAA batteries in series to get yourself a 13.5V and a 3V supply. The batteries won't supply enough current to do any serious damage, in case of the 13.5V version.
A 13.5V DC supply consists of nine 1.5V batteries connected together in series.
A 3V DC supply is two AAA batteries connected in series. This will be used to simulate the 3.3V supply from the BeagleBone.
Visual check
Before we actually power up the board for the first time, we need to do the following basic visual checks:
Check...
