Plug-type Bluetooth serial-port electronic key
A Bluetooth serial port, electronic key technology, applied in circuits, electrical components, coupling devices, etc., can solve the problems of lack of smart phones, large structure and size of five-proof keys, inconvenient to carry, etc., to achieve light weight, small size, convenient carry effect
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[0009] The present invention will be further described below in conjunction with accompanying drawing:
[0010] Such as figure 1 Shown: the number of poles of the plug in this embodiment is 4 poles; the precision resistance in the characteristic resistance circuit is 4.
[0011] The plug J1 of this embodiment adopts a 3.5mm universal 4-pole earphone plug with a model of XXHD / p20, 1 pole and 2 poles are serial port terminals, 1 pole is sending Tx, 2 poles are receiving Rx, 3 poles are connected to the positive pole of the DC power supply, and 4 poles Connect the negative pole of the DC power supply, and connect the characteristic resistance circuit in parallel between the 3 poles and 4 poles.
[0012] The Bluetooth serial communication module IC1 adopts the Bluetooth serial communication module of model HC 05, which is powered by 3.3V, where Tx (terminal 1) is connected to the 1st pole of the plug, Rx (terminal 2) is connected to the 2nd pole of the plug, and Vcc (terminal 12)...
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