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Connecting, and take care of the power

A project log for Water Level measurement using cheap Radar sensor

Measure the water level using a cheap HLK-2413 Radar Sensor

cees-meijerCees Meijer 04/14/2026 at 19:230 Comments

According to the datasheet, you can connect the sensor as follows:

And then to a Serial to USB converter:

Serial to USB

This may look OK, but there was no way I could get it to work. And when checking the power to the sensor it was found to be 2.5 V. It looks like it is drawing more power than the converter can handle. 

So I added an external power supply, and two capacitors to the power line. This works way better.


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