My project uses an ultrasonic module to detect water levels. The ultrasonic module I chose is CH-SR04. The detection range of this module is 2~450cm, and it can detect changes in water levels within a
[size=6]Configure the working mode of USart 1, specifically the baud rate is 115200, 8 data bits, 1 stop bit, and no hardware flow control, that is, 115200 8-N-1. What does the last N mean? [/size] [s