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Meder Reed Switch, Digmesa Flow Meter & Arduino?

Former Member

Hi,

 

Complete arduino newb and want to use this reed switch I already have MK04 Reed Sensors  It doesn't look like they make the exact model anymore (MK4-1A71-BV10102), but its a 1A/Form A with 2 wires.  Can I connect two wire sensors to Arduino or have to be 3 wires?  I think maybe I can do it this way, but don't want to fry anything.  bildr » Simple Temperature With Thermistor + Arduino  Or maybe don't connect 5v because magnet generates power?

 

Also have this flow meter http://www.digmesa.com/wp-content/uploads/2014/01/FLOW-SENSOR-FHKSC.pdf  Can I do it like this?  Seeedstudio Forum • View topic - Tutorial: Reading Water Flow rate with Water Flow Sensor  What I am not sure is the voltage, it says it is 20v or 24v.  I don't know how that affects things since Arduino 5v.

 

Thanks for any help!

Parents

  • The reed switch is just that a switch, activated by a nearby magnet, treat it like a button on an arduino input and you should be fine as long as the wires are not too long or near hi voltage interference

     

     

     

    The thermistor / resistor pair you show in the other diagram should work by simply feeding the junction of the two into the analog input of the Arduino, A5 for instance

     

     

     

    The reed switch is not a magnet and has no coils to generate power, it is simply a switch contact that closes when a magnetic field is close enough to make the contacts pull together (Or separate depending on the model)

     

     

     

    The flow sensor has two issues,

     

    1.       It runs on 20 or 24V or so it seems, you most lightly won’t have this available to you easily without buying an adapter

     

    2.       It does not specify the output pulse, this could be a relay contact closure, a hall effect sensor or something completely different so until you know it is tough to advise, I suggest hooking it up to a meter (Not Arduino) and powering it up to see what it gives out, if you can find more product details that would help us advise you

     

    Technically you can do something similar to the example linked in but your interface would be different depending on the output and actual supply of the flow meter

Reply

  • The reed switch is just that a switch, activated by a nearby magnet, treat it like a button on an arduino input and you should be fine as long as the wires are not too long or near hi voltage interference

     

     

     

    The thermistor / resistor pair you show in the other diagram should work by simply feeding the junction of the two into the analog input of the Arduino, A5 for instance

     

     

     

    The reed switch is not a magnet and has no coils to generate power, it is simply a switch contact that closes when a magnetic field is close enough to make the contacts pull together (Or separate depending on the model)

     

     

     

    The flow sensor has two issues,

     

    1.       It runs on 20 or 24V or so it seems, you most lightly won’t have this available to you easily without buying an adapter

     

    2.       It does not specify the output pulse, this could be a relay contact closure, a hall effect sensor or something completely different so until you know it is tough to advise, I suggest hooking it up to a meter (Not Arduino) and powering it up to see what it gives out, if you can find more product details that would help us advise you

     

    Technically you can do something similar to the example linked in but your interface would be different depending on the output and actual supply of the flow meter

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