For the Gravity Analog Dissolved Oxygen Sensor, it’s generally okay to submerge it at 1 meter for seawater oxygen level monitoring. Make sure to calibrate it properly, maintain the membrane and solution, and handle it with care. Check with the manufacturer or community forums for specific depth ratings and user experiences. [url=https://www.publix-passport.com/]PublixPassport[/url]
 

The blinking green light on your Beetle ESP32 - C3 board is likely a status indicator showing that the board is powered and running your sketch. It’s not necessarily related to charging, especially since you’re not charging a battery. Check the board’s documentation or your sketch code to see what the LED behavior is meant to indicate.