Waterproof Ultrasonic Sensor with External power supply

Hello,

Fist of all I’m very new to Arduino. And I need some help.

My water proof ultrasonic sensor ( JSN-SR04T v2) works fine when I connect the 5V from the Arduino UNO. But when I switch the power supply to an external one (still 5V) it starts to read 0.

Why is this happening and how could
I fix it ?

Please help.
Thanks.

Try connecting all of the grounds.

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