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How to check the state of the relay contacts?

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sr_raval

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Hello Everyone,

I would like to check the state of relay contacts, means everytime i want to check the status of the relay either its ON or OFF, insort by this feedback path circuit i want to know the status of the relay via microcontroller.

Help to find out the suitable circuit for this.
 

tusemo

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That can be done in several ways, here is one,
2012-10-08-020.jpg
You should know the voltage of the NC pin and by choosing Rb you can drive the transistor and chose a proper Re to have 3v-5v to transfer the information to the pic's pin
 
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sr_raval

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what would be the values of resistors and transistors? i am using 12A 24VDC electromechanical relay and microcontroller operated on 5VDC

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what would be the values of resistors and transistors? i am using 12A 24VDC electromechanical relay and microcontroller operated on 5VDC
 

tusemo

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what is signal or power voltage to be controlled by the relay
 

abhichaotic

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what would be the values of resistors and transistors? i am using 12A 24VDC electromechanical relay and microcontroller operated on 5VDC

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what would be the values of resistors and transistors? i am using 12A 24VDC electromechanical relay and microcontroller operated on 5VDC
What is the resistance of relay coil only then i can decide transistor and resistor.
 

sr_raval

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Resistance of relay coil is 1600 ohms, please go through attached datasheet of relay, consider 24VDC relay

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Resistance of relay coil is 1600 ohms, please go through attached datasheet of relay, consider 24VDC relay
 

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