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Thread: Relay dropping out momentarily

  1. #1
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    Relay dropping out momentarily

    Just playing with my brain, I have a relay hooked up to the brain, nothing else other than 12v power and the USB. The relay drops out momentarily every few seconds. It's inconsistent, and just clicks as it drops out and pulls back in before it drops all the way out. The 12v centre positive transformer is rated at 2A so I know that i'm not short on power to hold the relay in. The LED beside the output port flickers as it loses voltage and reenergizes instantly. This random clicking is driving me crazy!

    I've now tried this with multiple relays, and even a better faster computer, still have the same problem.

    As far as how I'm setting it up I went through the ninja kitty wizard of doom with the default template to make the setup as quick and painless as possible so there's really nothing complex or extra going on. I have no inputs hooked up at the moment.

  2. #2
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    Any suggestions?

  3. #3
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    I had the same issue with mine. It was a hardware problem. The replacement worked great.

    Yours maybe not be the same issue though. Use a multimeter to check the voltage you're putting into the brain, and the voltage on the output ports.
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  4. #4
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    It could be a hardware issue. My power supply says I'm putting 11.93V in which should be plenty for pull-in on the relays. With no load, the output ports I checked all say 11.10.

    With relays connected, measuring at the coil inputs on the relays themselves, I have a range from 10.2V to 14.1V depending on which output port I check (and of course, depending on the specific relay I have connected to the output). My voltages are all high enough to hold the relay in, and when it drops out it just pulls out and in so fast I just hear one "click".

    Similar to your problem?

  5. #5
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    I also do need to add that I'm using a cheap multimeter so the voltages I posted are probably out a bit. I would guess that they're all a little bit low. It gives a good idea to what's going on though.

  6. #6
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    Could be a hardware error or it could be a slow refresh rate on the serial connection. The brain has an inactivity timeout if the connection is lost or not polled quickly enough but I don't recall exactly what it is. My bet's still on the first guess though...

  7. #7
    Fusion Brain Creator 2k1Toaster's Avatar
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    Does the same thing happen to all ports, or just the one?
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  8. #8
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    On all ports. Any relay on any port does it. The LED on port 5 also doesn't work properly (really really dim) but I wouldn't think that's a related issue.

  9. #9
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by acbusdriver View Post
    On all ports. Any relay on any port does it. The LED on port 5 also doesn't work properly (really really dim) but I wouldn't think that's a related issue.
    When did you get yours? I tested all that were sent out since the end of December personally to work. Also you did get a full brain, or a semi-defective one?
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  10. #10
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    I ordered a full brain, not semi defective. I ordered it at the beginning of January, and it arrived last week. The clicking is inconsistent in timing but I can count on it happening sometime after I energize the relay. Sometimes it will go for a minute without any issue, other times I'll turn on the relay and it will click 3 or 4 times within 10 seconds. With the relay attached I can see the LED just flicker when it drops, but without a relay connected and watching the LED i can't really tell when or even if the dropout is happening.

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