Description: 8255 using experimental device extension LED display circuit, A/D converter circuit, completed a similar temperature control experiment. Which the use of digital display set temperature, the use of variable potentiometer mimic temperature changes, a variable potentiometer with ADC0809 samples the output voltage as the sample temperature, the temperature of the ADC0809 samples to be displayed in hexadecimal on the screen, and compared with the set temperature, when the sample temperature exceeds the set temperature, start cooling the motor that is red when the sample temperature is below the set temperature, start heating the motor that green light. Respectively, using red, green light-emitting diode, said two refrigeration, heating electrical work. When the sample temperature is equal to the set temperature, the lights are not bright
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temperature controller.docx
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