![]() ![]() ![]() There are several options, one is this microSD to SD adapter. Since the enclosure has very limited space, it’s not possible to fit a full-size SD card, without making a cutout on the side. The last bit of the puzzle is the SD card. Therefore I’ve mapped out all the 2×13 pins on the Pi to the pinout area, seen at the top-left corner of the PCB. The picture on the left below shows the back of the PCB, and you can see where the connectors go through the board.Īs the Pi is now facing down, it’s not easy to access the GPIO pins directly. However, there is one additional complication: the USB, Ethernet, and composite video connectors on the Pi are all quite tall, so it’s necessary to make cutouts on the OSPi PCB to allow these connectors to sink below the board. This will reduce the height of the overall assembly. It’s necessary to flip the Pi and plug it into OSPi facing down. Next, because the injection-molded enclosure is not high enough, I cannot continue using the current design where the Pi faces up and connects to OSPi through ribbon cables. If you have suggestions, please leave them in the comments section. It shouldn’t be the OpenSprinkler logo as the enclosure already has a printed logo. Eventually I think it’s best to put some graphic design here. So my temporary solution is to just put a sticky label at the back, thus covering the big empty hole (see picture on the right below). If I leave it alone, it looks quite ugly (see picture on the left below). I am not completely sure what to do with the LCD cutout. Of course since OSPi doesn’t have buttons and LCD, some of the cutouts are useless. It’s a bit tricky to figure out the position precisely, but I am glad that after two rounds of prototypes I finally got it right □ ![]() In fact, by carefully positioning the Pi, the Ethernet cable can also fit, albeit through the USB cutout instead of the RJ45 cutout. It also explains why the Pi has to be installed at an angle, as the picture at the top shows. Ouch! But after staring at it for a while like a geometric puzzle, I was delighted to find out that if you rotate RPi by 3 to 4 degrees, it fits perfectly! This gave me inspiration to further develop the idea. It turns out that, due to the positions of the support pillars, the enclosure is just a little bit too narrow to fit RPi at a straight angle. After all, the injection-molded enclosure was made before OSPi came into place, naturally it was not designed with RPi in mind. When I was first fiddling with the idea I didn’t think it was at all possible. But the ‘how’ part proves to a non-trivial engineering challenge. In fact, in the near future OpenSprinkler Beagle will also adopt the same enclosure, and hence all three will have the same exterior look. Using the same enclosure also gives both products a consistent look. This will bring down the cost quite a bit. On the other hand, the microcontroller-based OpenSprinkler already has an injection-molded enclosure (and I paid a good amount of money for the mold!), so it makes sense to consolidate the design to use the same enclosure. The first is cost reduction: the current OSPi uses the Serpac WM032 enclosure with custom cutouts. Wait a minute, what is this strange looking board?! And the Pi is installed at an angle? What’s happening here? Well, the new design is all centered around one simple goal: to fit OSPi and RPi into the existing OpenSprinkler injection-molded enclosure. Curious what the next version of OpenSprinkler Pi (OSPi) is going to look like? Here is a sneakpeak preview of version 1.4: ![]()
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