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  • stupid relay question

    ok using a standard automotive relay with the fusion brain should I be activating the positive or negative coil using the fusion brain I have finally gotten around to starting the hard wiring of the items my fusion brain will control but i can't get the relays to trigger I know it is switched ground on the digital outputs but I can't get the relay to trigger.

    so basically what I am saying is Help

    Thanks,
    Yonu

  • #2
    How do you have it hooked up? It should be from the positive rail of the FB, through the relay coil, into the digital output (I think)
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
    RevFE
    My Shop

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    • #3
      ok now I am confused sorry that just doesn't make any sense to me

      sorry

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      • #4
        oh and sorry I forgot to include how I have it hooked up here is the diagram of how i have it hooked up I am using the switched ground and i am not using the fusion brains 12v+ to power the relay

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        • #5
          Your diagram is correct. The switched grounds on the FB are the inner pins. The FB on the same ground as the 12V you are using? The FB power jumpers set to 12V power and not USB power?

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          • #6
            it is a v3 FB so i can't change the power and yeah it is on the same 12v ground at least according to my voltmeter

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            • #7
              ok here is a odd one I decided to try something so i disconnected the power from the brain and it stayed on via the usb power I would assume this is not normal for a v3 fusion brain?

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              • #8
                I found the answer to the power staying on issue so I am going to double check my relay and see what is going on because if i unplug the relay the FB cuts off if i reconnect it it turns back on.

                so should I have a diode on the line to the digital output on the Fusion brain?

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                • #9
                  ok I double checked the relay and it is right i tried 2 others to make sure it wasn't a bad relay I even tried a diode in the line the diode stops it from turning on if i remove power however it doesn't turn on the relay

                  so if anyone has an idea i would be most greatful,
                  yonu

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                  • #10
                    If you are using our relay, you just plug it in and it works.

                    You need to connect +12v to one side of the coil and then the other side to the ground switched port on the Fusion Brain.

                    The port will always show 0v or NC (Not Connected) when on or off respectively. It will never show the 12v or anything.
                    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

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                    • #11
                      ok a couple of questions.

                      if the led on the board comes on then i assume the output should work correct?
                      and
                      second if I just a standard automotive relay then how should I have it wired?

                      Thanks,
                      Yonu

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                      • #12
                        Originally posted by yonu View Post
                        ok a couple of questions.

                        if the led on the board comes on then i assume the output should work correct?
                        As long as the ULN chip is not blown, it is a fair assumption.

                        Originally posted by yonu View Post
                        if I just a standard automotive relay then how should I have it wired?

                        Thanks,
                        Yonu
                        Coil to the two ports, then the other side to whatever you are powering.
                        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

                        Comment


                        • #13
                          ok so based on what you put about the relay coils is this diagram correct?


                          and how do I know if the ULN chip is blown or not?

                          Thanks,
                          yonu

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                          • #14
                            not trying to be a jerk but some kind of answer would be nice

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                            • #15
                              Yes the diagram is correct. Make sure the relay doesnt pull to much to activate its coil. Less than 500mA is required, half of that is recommended if you are doing a lot.

                              Like I said before, the relays in our store are plug and play.
                              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

                              Comment

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