When you say there is no voltage on Pin 1 did you mean RPi’s GPIO 1 or did you mean OpenSprinkler Pi’s Zone 1 port? The voltage should be measured between the COM (common) terminal and Zone 1 terminal. Also, you should measure AC voltage, not DC voltage. Do you actually have a solenoid connected between COM and zone 1, or are you just measuring voltage and claiming that it’s not working?