OpenGarage Forums Hardware Questions Relay input opengarage

  • This topic has 3 replies, 2 voices, and was last updated 5 years ago by Ray.
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  • #277

    grotennl
    Participant

    Hello,

    Love your project, build it. One question, why is the relay always on? I measure high level all the way, if the button pressed it will de low for a moment.

    why this way of working?

    regards,
    Erik

    #281

    Ray
    Keymaster

    You said you measured ‘high level’ all the way — could you clarify you which two points are you measuring this voltage?

    #293

    grotennl
    Participant

    At start up the relais is immediately activated, saw some posts on Blynk with other guys having the same problem with other projects. Still don’t get it, code is correct and defines pin low when not activated by a trigger.

    #303

    Ray
    Keymaster

    I’ve never seen this issue. Did you build you own OpenGarage or did you buy from us? If you are using a relay board, note that many relay boards are ‘active low’ type, and that could explain the reverse logic. If you are using your own relay, and use a MOSFET to drive it, make sure you have a resistor between gate and source to keep the MOSFET off during startup.

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OpenGarage Forums Hardware Questions Relay input opengarage