Description: DHT21 use examples
//SCM: AT89S52 devices or STC89C52RC
//function: serial send temperature and humidity data crystals 11.0592 M baud rate 9600
//hardware connection: P2.0 mouth to mouth, DHT11 DHT11 communication connection of power and the power of the single chip connected to a serial port, microcontroller and add MAX232 connecting a computer
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51_DHT21.c
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