OpenSprinkler DIY v2.2u Build Instructions

In this section, you will test the circuit and make sure it functions. If you’ve already inserted the two ICs, take them out for now. First, measure the resistance between VIN (+5V) and GND as well as between VCC and GND. These pins can be located in the pinout area above the LCD headers.

via http://rayshobby.net/blog/?page_id=9667

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