When in double, please always go to:
support.opensprinkler.com
scroll down to ‘OpenSprinkler Pi’ section and check the OpenSprinkler Pi user manual. It contains information about voltage testing, and pin diagrams.
5V on VCC-GND is WRONG: VCC should be 3.3V, not 5V. OSPi does not generate VCC voltage — it’s coming from your RPi. It’s likely you may have misaligned RPi with OSPi when you plugged it in. I’ve seen a previous case where a customer toasted two RPis before realizing he misaligned RPi with OSPi when plugging it in.