Introduction
OpenSprinkler Pi (OSPi) is an open-source sprinkler / irrigation extension board for the Raspberry Pi. It’s an easy and
low-cost solution to transform your Raspberry Pi into a capable sprinkler controller with unlimited number of stations,
for lawn and plant watering, farm irrigation and other similar applications.
The OSPi v1.43+ kit includes a set of laser cut acrylic enclosure, one assembled and tested OSPi circuit board and
terminal blocks. The built-in components include 24V AC to 5V DC switching regulator, solenoid drivers, DS1307 RTC
and battery, PCF8591T 8-bit ADC converter (4 input and 1 output), per-station transient voltage protector.
To get started, you will also need the following, which are NOT included by default and need to be purchased separately.
● a Raspberry Pi (any of the following versions: RPi 0; RPi 1 A+ or B+; RPi 2; RPi 3)
● a nano-size USB WiFi dongle (optional)
● a 4GB or above microSD card
● 24V AC sprinkler transformer (output voltage 22~30V AC, note that it’s AC, not DC!)
o Note: if you plan to use RPi 3: due to the power consumption of RPi 3, you may need an additional USB
adapter to power RPi 3 directly through its microUSB port.
● 24V AC sprinkler valves (note that it’s 24V AC valve, not DC or latching solenoid valve!)
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