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Millienium3 PLC Based Temperature Control Using LM 35

Author Affiliations

  • 1 Department of Electrical and Electronics Engineering, Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, AP, INDIA
  • 2 Department of electrical engineering, Andhra University, Visakhapatnam, AP, INDIA

Res. J. Engineering Sci., Volume 2, Issue (6), Pages 30-34, June,26 (2013)


This paper presents the PLC based temperature control using LM35 sensor. Measurement of temperature and its control has become a major part of the control systems operating in an environment which is temperature sensitive. In this paper, LM35 sensor is being used for the measurement of temperature and is then controlled using Programmable Logic Controller (PLC). The system will get the temperature from the LM35 and this temperature is then compared with the desired temperature. According to the measured value of the temperature, either the fan or the heat will be switched on. For the purpose of achieving the above measurement and control PLC is used as the interface. Before implementing these ideas directly into making hardware design, software simulation is being done using PLC software. The result is obtained in the form of proportional electrical signal i.e voltage. This voltage is manipulated directly to give the temperature which is being measured.


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