![]() OSPi makes use of four of RPi’s GPIO pins to control the shift register, and two I2C pins (SDA, SCL) to interface with the built-in RTC and ADC converter. The circuit of OSPi is a subset of the OpenSprinkler and consists of a 24VAC to 5VDC switching converter, a shift register, triacs, DS1307 RTC and backup battery, and PCF8591T A/D D/A converter. In other words, it is a circuit board that allows an RPi to directly interface with sprinkler valves. OSPi is designed as an extension board that makes use of RPi’s GPIO pins to directly control sprinkler valves, without an additional layer of microcontorller and Ethernet controller. ![]() There are good reasons to do so, for example, to enable logging, to customize the default Javascript files, and to allow more advanced features such as weather-based and learning-based control. The idea of OSPi first came when I noticed that many users were setting up RPi to work with OpenSprinkler. It is based on the design of OpenSprinkler, but its ‘brain’ is an RPi instead of an AVR microcontroller. OpenSprinkler Pi (OSPi) is an open-source sprinkler / irrigation extension board for Raspberry Pi (RPi).
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