A02YYUW Waterproof Ultrasonic Sensor FAQ【SEN0311】
SEN0311 sensor returns no data when connected to Raspberry Pi.
Enter the following command in the Raspberry Pi terminal：
sudo nano /boot/cmdline.txt
Add dwc_otg.lpm_enable=0 as shown in the figure below, and delete console=serial0, 115200
Open config.txt by enter:
sudo nano /boot/config.txt
and add dtoverlay=pi3-miniuart-bt
Reboot and check, if there's still no data, try to add console=ttyl in cmdline.txt and reboot again.
If you have other questions, just feel free to post them in our forum for consultation. We will reply them as soon as possible and improve the product FAQ gradually.