38hot bought a second-hand power supply. There was too much dust inside. It was not easy to use a vacuum cleaner or a rag. Finally, I thought of this trick and it worked.This content is originally cre
[b][color=#5E7384]This content is originally created by EEWORLD forum user [size=3]tiankai001[/size]. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and
[size=4](1) The RC oscillator circuit has a simple structure, is easy to adjust, and is economical and reliable. [/size] [size=4] [/size] [size=4](2) The oscillation frequency of the RC oscillator cir
[i=s]This post was last edited by Li Baiyi on 2021-12-22 21:11[/i]1 Test baud rate
AT
2 Turn off echo
ATE0
3 Check whether the SIM card is normal. If it returns to normal, go to the next step
AT+ECICC