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interfacing relay with avr microcontroller in altium

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Mohammad Ghorbani

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hi there . is this right interfacing a relay with microcontroller ?


Untitled.png
 

FvM

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The circuit has the advantage of minimal part count. It's O.K. if the relays will reliably engange with only 4.3V. Otherwise use standard common emitter driver with base resistor and freewheeling diode.
 

andre_teprom

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use standard common emitter driver with base resistor and freewheeling diode.

I usually put a ceramc capacitor close to the relay coil in order to provide some additional spike suppression.
 

Mohammad Ghorbani

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i'm condused . my schematic is this
Untitled.png

but in pcb auto roue it routing different . look at this

Untitled2.png


what is problem ?
 

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