update ds18b20.c, add pin connected way

guowenxue

2021-11-03 fcfb88f7bb207b825c3f59a8a0859f1e9146420c

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BIN_FILES=tcp_server udp_server
 
all: clean ${BIN_FILES}
 
tcp_server:
    gcc $@.c  -o $@
    
udp_server:
    gcc $@.c  -o $@
 
clean:
    @rm -f ${BIN_FILES}