TXD: Serial send,3.3V TTLLevel. RXD: Serial port to receive,3.3V TTLLevel. CTS: Serial flow control, temporarily not supported. RTS: Serial flow control, temporarily not supported. DC: Simulation, burn clock feet. DD: Simulation, burn data foot. RST: Module reset pin, the requirements are not less than5msOf the low level to reset. VCC: Module power supply pin, requiring DC3.3VPower supply, the supply current is not less than100mAThe Operating voltage range: 2.0V ~ 3.6V. GND: The module is public. led: Module indicator output pin, high level output, thenledPlease connect the series resistance. Before connecting, When the host does not record the slave address, it lights up every second100ms; When the host records the slave address, it lights up every second900ms; From the machine every2Seconds bright1second. After connecting,ledAlways bright KEY: Input pin, internal pull down. This pin is high for the master to clear the recorded slave address. PIO: Extended function, used to set the module master and slave mode, the default internal pull-up resistor, for the machine; external pull-down resistor1KTo the ground, for the host. |