RTD Thermocouple measurment Device using Signal conditioning

Signal conditioning circuit is designed using Op-Amp (operational amplifier) for measurement of Temperature using Thermistor as LM35, RTD (Resistance Temperature Detection) using PT100, and Thermocouple K-type for Digital conversion Atmega 328 microcontroller is used which gives output as LCD display at a range of temperature varies between -80 to 200 degC.

The basic building block of a signal conditioning circuit is a Wheatstone bridge which is an electrical circuit, forming a diamond loop used to measure an unknown electrical resistance by balancing two sides of a bridge & one side of which includes the unknown component.
This unknown component is the sensor which is used to measure the change in resistance & convert it into the physical quantity which need to be calculated ex. Temperature.

further to amplify this signal is processed with the operational amplifier to differentiate the input & output of the signal sent to the microcontroller.

Same principle is used here to get the temperature value within the desired range.
components used:-
LM35 Temperature sensor
RTD- PT100 temperature measurement probe used with signal conditioning
Thermocouple K-Type sensor with module
LDC 16x4 to display the value
Microcontroller -Arduino Atmega328P
LM324- Operational Amplifier
Resistors.

This can be more optimized with other ADC IC's & can be wireless controlled with an IOT application.