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see the link Exploring the Embedded Technology......... A SCHEMATIC OF DIGITAL THERMOMETER USING LM 35 AND 877A IS THERE. LM 34 IS FAHRENHEIT DETECTOR.IT GENERATES 10mV FOR 1 DEGREE FAHRENHEIT.That is for tEMP OF 30 DEGREE CELCIUS ,EQUIVALENT FAHRENHEIT IS AROUND 100 AND SO THE SENSOR OUTPUT...
I think there was some mistakes in ur program.Use 0b instead of "0xb" to represent binary. I presume smoke sensor was connected to the AN0/RA0 of the ADC.U need to configure the ADC first.PORTA=0xb00000000 is a wrong statmnt.Ur pgm required to wait for the input ie,sensor==1.
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