[brucep]

Thank you Ray, and all the others that make these updates possible. I can’t wait to upgrade and use some of the new features.

Regards.

Bruce

[brucep]

Hi,

Yes, a 2.0Amp 24VAC power supply will be ok. The OSPi and the RPi will together draw something around ~400mA (0.4A) under normal operation. The 24VAC input on the OSPi board has an inline fuse, which will blow if a fault…..such as a short circuit on an output, occurs. The OSPi will not draw more current from the power supply than it requires……just because your power supply is able to supply more current, it will not be used by the OSPi. The fuse will blow quickly, if a problem with the OSPi or RPi causes too much current to be drawn…..which protects both the OSPi and the power supply. There is also a secondary protection on the 5VDC output of OSPi, which is a polyfuse (see: http://en.wikipedia.org/wiki/Resettable_fuse for more details on how they work).

Hope That helps.

Regards

Bruce

[brucep]

Hi,
The transformer you have will work fine with the open sprinkler. The link you provded shows that one output is 24Vac 22.5 VA .93 amp, which is perfect.  If you use the “0” (black) wire, and the “24” (red) wire you will be all set. Make sure you disconnect, and/or insulate the “15” (white) wire so it does not accidentally touch anything it shouldn’t. It does not matter which order you wire the power connector to the opensprinkler, as it is AC.

Hope that is of some help.

Regards,

Bruce

[brucep]

Hi,

Yes, I have a dedicated OS to control garden lighting, and some zones on my other 2 are also used to control lighting. All you need is a 24V AC relay per individual zone, which you connect in exactly the same way as a water solenoid, there are some details here: https://opensprinkler.com/using-24v-ac-relays-with-opensprinkler/

Make sure you choose a relay with enough current rating to switch the entire load……if you have 600W transformer @12V that’s up to 50 Amps !!!

Or break up the lighting into zones so you can use smaller relays, or even convert halogen into LED to reduce power consumption.

Regards,

Bruce

[brucep]

Thanks Ray,

Got it all sorted, and working. I’m using a 16MHz Xtal as X0 (on HW ver 2.2/nov) Is this correct? I am a bit confused as the schematic shows 12Mhz.

Cheers,

Bruce

[brucep]

Hi Ray,

Thank you for the fast reply. I read the message “Note that OpenSprinkler does not use a bootloader, so please do not upload any bootloader to it.”  on the firmware update page, and thought that there was no boot loader required.  I’ll program optiboot using ISP port using a  USBasp. Can you please confirm that the 2.2u Nov/14 hardware uses a 16MHz Xtal for the atmega (X0).

Thanks again,

Regards, Bruce

 

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