idk if you got a reply yet, but you're simply getting the reading from that pin, it's like that since you don't have any reference, and it's picking up disturbances, if you connect it to something that has common ground with the board, it'll stabilize
idk if you got a reply yet, but you're simply getting the reading from that pin, it's like that since you don't have any reference, and it's picking up disturbances, if you connect it to something that has common ground with the board, it'll stabilize