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Topic: Issue with HG7881 motor driver and HC-SR04 sensor (Read 82 times) previous topic - next topic

FunnyItsElmo

If i use the HG7881 and power up a motor, the readings of the HC-SR04 are totally wrong. I have read in another post that probably the h-bridge is poorly isolated and that i need a second power source to supply the sensor and motor driver separately.

Is there another way to isolate the h-bridge without adding a second power source?

Regards,
FunnyItsElmo

FunnyItsElmo



Here is a picture of my setup. The notes represent the connections to the HG7881. The parts work on their own but i cant get them to work together with a single power source.

Any ideas?

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