One of the more popular social activities in China is group dancing in public squares. Often the pastime of many middle-aged and older women, participants are colloquially referred to as ...

At the heart of the door monitoring circuit, there is an M95 GSM-module MOD1 with antenna and SIM-card holder SIM1. The resistors R15 through R17, the diode array D7 and the capacitors C19 through C22 ...