Abstract: SMS short message service, as a basic service of GSM network, has been paid more and more attention by system operators and system developers. With GSM network as data wireless transmission
Help, we are working on a project, using STM32F103C8T6, SIM800C 2G network, RC522 on the motherboard for radio frequency identification, currently 120 have been produced, more than 70 have been put in
If you connect it directly to a 220v plug and turn on multiple electrical appliances at the same time, how can you distinguish the characteristics of voltage and current? . . .
[color=#a0522d] With the popularity of smart phones, mobile power banks, as one of the supporting equipment, have also become a necessity in people's lives. However, there are more than just mobile po