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  • #22419

    korban
    Member

    Hi,

    I was looking at a cheaper way of making an OpenSprinker Pi and was wondering if you really needed the RTC?

    Could it just update from the network/web?

    Also with the 5v power supply, I’m running mains to the unit anyway for the 24VAC transformer, could a just use a cheap mains to 5V 1A USB charger?

    eg http://dx.com/p/uk-plug-usb-power-adapter-blue-white-100-240v-1a-171062

    #23605

    Ray
    Keymaster

    If you don’t need 24VAC->5VDC conversion, and you don’t need RTC, then you can get the OpenSprinkler Zone Expansion Board, which requires a minimum of 6 pins (3.3V, GND, and four shift register pins) to interface with Pi.

    #23606

    korban
    Member

    Would there be any issue tying the ground of a 240 to 5V converter to once side of the 24VAC? I assume they would need to be joined for the triacs to operate?

    And does your code operate fine without the RTC?

    #23607

    Ray
    Keymaster

    Yes, one wire from 24VAC transformer is the COM (common) wire, and the other wire should be tied to ground. AC transformer is no-polar, so it doesn’t matter which wire you pick as ground.

    The code does not use RTC at all.

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