Using SIM300 to send SMS to control the microcontroller, everything was normal at the beginning, sending and receiving SMS were normal, but after running for a few days, SIM300J was disconnected inexp
I have a batch of products, among which there are several boards with very strange problems. The problems are as follows: I can download loader.bin through the serial port, but I cannot download uboot
[size=4]1. Open-loop voltage gain Auo and bandwidth: Auo refers to the differential mode voltage gain of the op amp when there is no external feedback. The larger the Auo, the better. Normally 10 to 4
With the development of science and technology, especially the use of computer technology, automobile anti-theft technology has become automated and intelligent. All-round anti-theft alarm for automob