For now please check the PDF-version of OSPi v1.4 User Manual. Instructions and webpages will be updated in the next few days. You have the choice of your favorite programming language, and virtually unlimited program and data storage size. One of the biggest benefits of using embedded Linux like RPi is that writing software is much more convenient, and it’s possible to introduce more advanced features like weather-based and learning-based control. In any case, if you are not sure, you can always follow the pin-to-pin connections above to check and verify. polarized connectors) to the original version of expansion board, because these cables are wired differently. Last bit to keep in mind: you should always use the cable that comes with your expansion board: DO NOT apply the version 1.1 cable (i.e. If you have multipled expansion boards, you can cascade them by following the OUT -> IN links. The cable should make the following pin-to-pin connections:ĭOUT (a.k.a QH*)–>DIN, CLK–>CLK, LAT–>LAT, NOE–>NOE, VCC–>VCC, GND–>GND When in doubt, you can always read the PCB silkscreen. Make sure on one end of the cable, the arrow is pointing to DOUT, and on the other end, the arrow is pointed to DIN. Here is a simple tip to keep in mind: the connector has one corner marked by an arrow. If you have received the original version of the Zone Expansion Board, that does not come with polarized connectors. Warning: ENSURE the extension cable is plugged in correctly, otherwise you may damage your Raspberry Pi! Otherwise you won’t be able to insert the connector, due to the low clearance of the circuit board. Note: if you have OSPi v1.3, you need to remove half of the bump (using scissors or a diagonal cutter). If the bump faces down, you won’t be able to insert the connector all the way in, so this prevents incorrect connections. If you have received Zone Expansion Board v1.1, it comes with polarized cable connectors: each connector has a ‘bump’ on it, and there is only one way to plug them in (i.e. To make the connection, use a 2×4 extension cable to link the EXTOUT port of OSPi to the IN port on the expansion board. OSPi does not limit the number of stations - you can go up to a potentially unlimited number of stations, thanks to the use of RPi. Similar to the OpenSprinkler, a single OSPi controls 8 stations, but there is a built-in shift register connector which allows it to be linked to zone expansion boards to enable more stations. For multiple valves: one wire from each valve is combined together and that goes to the COM terminal, and the other wire of each valve goes to its corresponding station terminal. Connect one wire to the COM (Common) terminal (either one of the two ports), and the other wire to an individual station terminal (S1-S8). Specifically, a sprinkler valve has two wires. See the two pictures below:įinally, you can connect sprinkler valves to OSPi via the COM (common) terminal, and the individual station terminal (1-8). In particular, two of them (one on the bottom and one on the left) have screws, which you can use to secure RPi at the edge of the PCB. On OSPi v1.0, there are five separation pillars. 1, the lower-left pillar in the picture below will get in touch with some of the components on the rev. Warning: You should only use this arrangement with RPi rev. 2 to OSPi via the two screw holes, as shown in the picture on the right below. Once this is done, you can secure the RPi rev. 2 has two on-board screw holes, which you can make use of by moving one of the separation pillars following the picture on the left below. More details can be found in the OSPi v1.0 instructions below. You can use the two screws marked by yellow circles to secure the RPi to OSPi at the edge of the RPi’s PCB. From OSPi v1.02 and above, there are four separation pillars.
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