Termometro microcontrolado

This circuit presents a thermometer using a microcontroller PIC 16F88, the temperature sensor is a LM35, is a linear sensor so that the output we have a proportional relationship to the measured temperature in exactly 10mV per ° C. The circuit consists of 2 distinct parts, the first is based on amplifying the sensor output to a measure validated to work with tenths of degrees, it used 2 For operational amplifiers whose gain will have to adjust it to be> 10. To do this we will measure with the voltmeter to the sensor output and then we will measure the output of the amplifier and adjust the potentiometer to obtain a value taken as the sensor pin X10. The second part consists of the microcontroller itself which is done by sampling and measures taken the last an average of 50 measurements, so it makes it more stable and not as vulnerable to their departure, and that failure would always be changing the tenths digit.

Vin: +9 Vdc

Designed in Proteus v.7.4 SP3