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see basicaly u have to first convert ur analog signal which is coming frm tempreature sensor(for e.g. lm35)into digital signal using adc so that ur controller can understand it.and then u have to take output frm controller into lcd and fan.
download the data sheet of eprom serial which is an i2c protocol at24c02
the codes are all checked and are working propely.even the comments are also written ther u shuld check whether the code is for avr or 8051.and check ur circuit
u wil first require a gps module which will cost near about 2000 rs.