C language 8X8 dot matrix scrolling display of temperature, DS18B20 operating procedures sbit DQ P3 ^ 3 unsigned char time // set the global variable, specifically for strict delay Function: The sensor DS18B20 initialization, read response signal Export parameters: flag bit Init_DS18B20 (void) { bit flag // store DS18B20 existence flag, flag 0, indicates the presence flag 1, indicates that there DQ 1 // first data line HIGH for (time 0 time <2 time++) // a slight delay of about 6 microseconds DQ 0 // and then the data line high low, required to maintain 480 ~ 960us for (time 0 time <200 time++) // a slight delay of about 600 microseconds // To DS18B20 to emit a continuous 480 ~ 960us of low reset pulse DQ 1 // release the data line (data line pulled) for (time 0 time <10 time++) // Delay about 30us (after the release of the bus to wait for 15 ~ 60us let DS18B20 output pulse exists) flag DQ // output of the microcontro

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