Introduction - If you have any usage issues, please Google them yourself
8051 with the DS18B20 temperature measurement, with the 1602 show four decimal places, P1 ^ 7 for the DS18B20 single bus pin, P2 ^ 4-P2 ^ 6 corresponds to 1602' s: RS, RW, EN.P0 ^ 0-P0 ^ 7 for 1602DB0- DB7 interface.