Relay Output Problem

Paul H asked Oct 13,2020

I'm doing a Sanitiser dispenser with an Ultrasonic Sensor. For every alternate sensing of the hand, I'm getting a brief disturbance signal from the relay. It goes on for a few milliseconds and goes off.

I'm guessing this is because of the interference from the Solenoid of the relay or water Pump so, I even used Flyback diodes to control the back emf. The problem still there.

Anyone konw why this is happening and How to avoid it? I'm planning on using optoisolators or MOSFETS will those options work?

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