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Z-Uno - Z-Wave + Arduino with HS3

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    #16
    Yes, the Z-Uno alone draws 1mA so with a 3000mAh you should in theory get 3000 hours (125 days, so four months) not counting in any losses and working that it is 100% charged etc. It does seem to imply that the 1mA is to do with the DC-DC conversion ("about 70 μA if DC-DC is turned off by unsoldering R12" - https://z-uno.z-wave.me/technical/) but it's not clear then if you have to provide it directly with a 3V3 supply (I am guessing you do) so you'd likely still have to convert it somehow if you were using a 5V power bank.

    A latching relay sounds like the sort of thing to look at (smaller the better for the lower opening current), I'm afraid I don't have one in my box of relays else I'd try it for you and see how I got on. It sounds possible albeit could be quite expensive if you look at one Z-Uno per LED strip.

    I don't imagine you would have great success trying to modify an existing Z-Wave interface, the ICs are probably proprietary and expecting all sorts of things before they work. I doubt it is as simple as one pin is saying open/close the motor, even if it was the IC is likely to be in a format that would be incredibly difficult to deal with (whether BGA or similar pins).

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      #17
      I'd imagine that this example would be somewhat similar to your requirement.

      http://z-uno.z-wave.me/examples/batt...d-wall-switch/

      I can't back up the battery life with data, but have read of users using a setup of coin sized lith batteries in parallel to obtain a good battery life.

      I would be asking the question on the ZUNO forum to get a better response.

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        #18
        I could live with 4 months battery life lol! I did read somewhere that the dc-dc stepdown for Arduino's in general weren't very efficient. There was also a post where a guy was trying to power it by batteries @3.3v, and was instructed to not then plug in the USB power supply without doing something to protect the circuit.
        I posted in the Z-Uno forums, but I gave up checking the post after a couple of weeks with no replies.
        I have a lot of these AA snap together battery things, and I thought I could just have a couple of AA's in series for 3v, and a couple more parallel for capacity, but doing some reading I think then I would need some type of step up converter to get the 3.3, and if I tried using rechargeable AA batteries, I think the voltage would be even lower, so now i'm not sure about how to get it the 3.3v.
        https://www.teachersource.com/produc...city-magnetism

        So, Mr Happy, can I get a list of what I would need? I keep thinking about getting an Arduino Starter Kit just for starters, that I think comes with the breadboard. The parts for the Latching Relay I have no idea, and any other things I would need. Thanks!

        Here's my Post on Z-Wave.Me, this guy says something about FLIRS, which I think is built into Z-Wave Plus devices, and a Bistable Relay, which reads a pulse and closes circuit, and reads another pulse to open.
        https://forum.z-wave.me/viewtopic.ph...powered#p72019
        Last edited by tome10; January 21, 2018, 10:18 PM.

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          #19
          You won't have any problems running at 3V.

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            #20
            Originally posted by tome10 View Post
            I could live with 4 months battery life lol! I did read somewhere that the dc-dc stepdown for Arduino's in general weren't very efficient. There was also a post where a guy was trying to power it by batteries @3.3v, and was instructed to not then plug in the USB power supply without doing something to protect the circuit.
            I posted in the Z-Uno forums, but I gave up checking the post after a couple of weeks with no replies.
            I have a lot of these AA snap together battery things, and I thought I could just have a couple of AA's in series for 3v, and a couple more parallel for capacity, but doing some reading I think then I would need some type of step up converter to get the 3.3, and if I tried using rechargeable AA batteries, I think the voltage would be even lower, so now i'm not sure about how to get it the 3.3v.
            https://www.teachersource.com/produc...city-magnetism

            So, Mr Happy, can I get a list of what I would need? I keep thinking about getting an Arduino Starter Kit just for starters, that I think comes with the breadboard. The parts for the Latching Relay I have no idea, and any other things I would need. Thanks!

            Here's my Post on Z-Wave.Me, this guy says something about FLIRS, which I think is built into Z-Wave Plus devices, and a Bistable Relay, which reads a pulse and closes circuit, and reads another pulse to open.
            https://forum.z-wave.me/viewtopic.ph...powered#p72019
            I've ordered a latching relay to test the current draw and should be here in a couple of days so I will let you know how I get on. I don't imagine you would need anything apart from the Z-Uno, a transistor/base resistor, a diode just to stop back EMF and the relay.

            I was going to use one of those small capacity power banks, the type you can pick up for nothing and they have a 1200mAh capacity (advertised!). I guess it's probably not all that efficient to go up to 5V then back down but still it is just to test and the relay coil I have bought is 5V so I would need it anyway. I do have a minor concern about the boost circuit in the power banks may switch off with only a 1mA load but I will see.

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              #21
              Originally posted by mrhappy View Post
              I've ordered a latching relay to test the current draw and should be here in a couple of days so I will let you know how I get on. I don't imagine you would need anything apart from the Z-Uno, a transistor/base resistor, a diode just to stop back EMF and the relay.

              I was going to use one of those small capacity power banks, the type you can pick up for nothing and they have a 1200mAh capacity (advertised!). I guess it's probably not all that efficient to go up to 5V then back down but still it is just to test and the relay coil I have bought is 5V so I would need it anyway. I do have a minor concern about the boost circuit in the power banks may switch off with only a 1mA load but I will see.
              The sum total of my experience is I wouldn't bother, using that example FLIRS sketch and powering from 5V it stays at the always operating current (30 odd milliamps). I can't see that I am doing anything wrong according to the data but I'm not noticing any difference in current draw as per what the specification says, could be an issue with the firmware or something I don't know but I'm not sure I would rush to buy any of them.
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                #22
                I think this post suggests snipping the R12 allows better battery performance. But nobody ever states how much better. I think 'Maybe' since your powering it through USB, it thinks it's powered and operates as a repeater. Which may explain the constant 35mA.

                https://forum.z-wave.me/viewtopic.ph...f45a1&start=10

                This details the sleep modes. I have yet to find hard info on power consumption on battery utilizing FLIRS.

                http://z-uno.z-wave.me/Reference/ZUN...SLEEPING_MODE/

                After changes to sleep modes, the uno has to be excluded and re-added to the controller to take effect.

                This guy says 0.1mA in FLIRS, and this appears to be the link someone wanted to give me in the Z Uno forum that was a broken link.
                https://github.com/petergebruers/Z-Uno-FLiRS-LED-DEMO
                Last edited by tome10; January 25, 2018, 09:39 PM.

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