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Interface SPDT relay 20 Amps with PIC32

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jaj540

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we hav to interface a spdt relay(20 amps) with pic32.. is there any available interfacing diagram for the same... pls help us... urgent :(
 
You could use a transistor circuit to drive it. Does the relay coil itself draw 20 amps?
 
I believe that a common approach is to drive the coil with a transistor or Darlington array. e.g. ULN2803. You also want a reverse biased diode across the coil to absorb the inductive emf when the transistor switches off.
 
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