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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!

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  • in reply to gadget.iom

    I would suggest having the resistor to + 5V and the reed switch to ground, this way if the code programs the pin as an output and LOW, you’re not trying to ground the 5V rail without current limit and blow the arduino pin if the read switch is closed

     

     

     

    (The Arduino has limiting built in to prevent sourcing too much current in the event the pin is grounded by the switch)

     

     

     

    Just a different option, in most cases you will be ok

     

     

     

    Peter

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