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Topic: Relay help (Read 579 times) previous topic - next topic

Cmayberry

Hi,

Trying to control a home boiler with an arduino.

Using 5v relay that supplies 250v 10A
the boiler is on a 6A circuit to the breaker.

The relays are closing making a connection and immediately open again. Has anyone have an idea why this might be.

Relays are retrieving power from the 'duino.

Is fly back circuitry required for this

The relay has to turn in a pump fan and then an ignition spark

Grumpy_Mike

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Has anyone have an idea why this might be.
Yes
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Relays are retrieving power from the 'duino.
An arduino output pin can not provide the current to switch a relay that is capable of controlling contacts rated at 240V @ 10A. You need to use a transistor to control the relay.

JimboZA

You need to use a transistor to control the relay.
Along these lines.
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Your answer may already be here: https://forum.arduino.cc/index.php?topic=384198.0

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