PC and LM35 Temperature Sensor based Temperature Monitoring System with AVR ATmega16 Microcontroller and LCD Display

PC and LM35 Temperature Sensor based Temperature Monitoring System with ATmega16 and LCD Display

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In this project, we will learn PC and LM35 Temperature Sensor based Temperature Monitoring System with AVR ATmega16 Microcontroller and LCD Display. Here, we will display and monitor the temperature of the surrounding or any other material to which the LM35 temperature sensor is connected for its temperature measurement in degree centigrade from a PC/Laptop and 16X2 Alphanumeric LCD.

Since the output of LM35 temperature sensor is analog in nature and ATmega16 microcontroller cannot process the analog signal directly. So, first it will convert the analog output of LM35 temperature sensor to digital values using its analog to digital converter and then it will process the digital value to convert the digital value in degree centigrade value. After converting the analog signal to digital, the ATmega16 microcontroller will send the digital value of LM35 Temperature Sensor to the PC/Laptop through its serial port using its USART communication protocol. But current generation PCs and Laptops do not have serial port in them, so we will use one USB to Serial converter cable which will create a virtual serial port in the PC /Laptop. Again, the output of USB to Serial cable can not be connected to ATmega16 microcontroller directly as the output voltage of USB to Serial Cable corresponds to RS-232 level. But the ATmega16 microcontroller needs TTL/CMOS voltage levels. For this, we will use MAX-232 voltage converter which will convert RS-232 voltage level to TTL one and vice-versa. The PC/Laptop receives the digital value of the LM35 Temperature Sensor and displays it in RealTerm Software for monitoring. Apart from PC/Laptop, ATmega16 microcontroller will display the LM35 Temperature Sensor value in an alphanumeric LCD. In this way, the temperature of the surrounding or temperature of the material to which the sensor is attached is monitored from both PC and alphanumeric LCD.

Now, lit a match stick or lighter near the LM35 temperature sensor or near the material to which sensor is attached and see the change in temperature in the PC/Laptop and Alphanumeric LCD.

Softwares Required

Hardwares Required

Name	Quantity
AVR Trainer Board-100 with ATmega16	1pc
AVR USB Programmer	1pc
LM35 Temperature Sensor	1pc
RG1602A 16X2 Alphanumeric LCD Green	1pc
RS-232 Driver Board	1pc
USB to Serial Cable-Y-105	1pc
12V, 1A DC SMPS Adaptor	1pc
10 to 10 FRC Female to Female Connector	2pc
1 to 1 Connector-Female to Female	10pc