Waterproof Ultrasonic Sensor with External power supply


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.

Try connecting all of the grounds.

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.