![]() ![]() I guess if the voltage is not 5V there is a tolerance range for the OSPi which may be wider than RasPi would put up with. ![]() ![]() What if I do not power the RasPi from the OSPi board and instead continue to power it from a USB power supply I have been using? I would connect the supply ground and leave the 5V off. Regarding your important note wrt the 5V supply voltage. I already installed all the software on my RasPi, can’t wait for my OSPi! I have been a RasPI user for sometime now. Great DIY project Ray, exactly what I was looking for! I just order an OSPi. I ordered when I got the message and I’m looking forward to making the changes to my code so it operates with your shift register design and getting it all mounted so the wife can’t complain about how it looks -). I tried doing weather feeds over the internet but they don’t tell you how much rain you got and it looks like the moisture levels are my best bet for optimizing the system. I’m leaning towards using mono based webservices and more than 1 pi parasiting power off the 24v lighting system. Right now I’m trying to work through long term solutions for detecting moisture levels in the soil so I can better manage the zones. You can hook it via the yellow RCA port to a TV or in my case I have a 16 channel IP DVR with a few cameras on it, so I popped the NTSC output of the pi on one of the DVR channels and I am using it to see the status of the sprinklers and anything else I might like to show status on. Oh, not using a camera on the pi but using the NTSC output of the raspberry pi for status. That being said, for a lot of home automation products (which are usually powered from wall adapters) I can see embedded linux is really the way to go: it’s only slightly more expensive (assuming volume quantity) but enables so much more. I can’t think of anything equivalent on Raspi. You can put the mcu to sleep most of the time to save power. – For battery powered controllers, the mcu-based circuit is obviously more suitable. Also, you can easily get a small quantity of mcus from retailers, while embedded linux chips are usually only sold in large quantity. As you’ve probably noticed, the OpenSprinkler has a DIY version for anyone who wants to build it from scratch. – Mcu-based circuits are easier to prototype at home. You may have seen those airflight entertainment systems getting stuck on a log-in or boot screen, and requires manual rebooting. – On a related note, if something goes wrong during booting (say the file system crashes or a device fails), Raspi might get stuck. – Embedded linux is relatively slow to boot up: if you want to restart the controller, a mcu-based one would restart instantly, while it may take 20-30 seconds for Raspi. Here are some differences I can think of: The content below has been updated and moved to a dedicated product page for OSPi at. As soon as I figured this out, I couldn’t resist ordering a small batch of prototype PCBs right away. At one point I started thinking: wouldn’t it be nice to design an extension board for Raspi, so that it can directly talk to sprinkler valves through the GPIO pins, without an additional layer of microcontorller and Ethernet controller? This has been on my todo list for quite a while, until one day I was playing with Raspi, and I suddenly that the I can actually fit a Raspi inside the existing OpenSprinkler enclosure. There are many 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 several OpenSprinkler users were setting up Raspi to work with OpenSprinkler. I bought a Raspi a few months ago, and have been quite happy with it since then, but I at that point I had not thought about designing an OpenSprinkler extension board for it. Since the beginning of Raspi, there have been many published DIY projects on how to use Raspi for home automation need. A more dedicated webpage will be available soon. This post serves as a quick introduction to the hardware and software setups. Hi, I am glad to announce the arrival of OpenSprinkler Pi ( OSPi) 1.0 - a sprinkler or irrigation extension board for Raspberry Pi that provides direct access and control of sprinkler valves. ![]()
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