hello. I am zeeshan. i need details on temperature detector using microcontroller 8051 project report pdf. i am doing semester project. i am living in pakistan. and studing in Bahria university and now doing semester project for this I need this project report with coding of 8051 controller. please help me..
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Temperature controllers are used in most manufacturing industries. Industries such as textile mill, pharmaceutical industry, oil refinery, etc. all require a temperature controller. Temperature controllers are used to maintain the constant temperature of the process or plant or any material. In said temperature controller system there is a setpoint temperature or setpoint temperature which is the desired temperature to be maintained. This reference temperature is set by external means. It can also be always adjustable according to requirements. Once this temperature is established, the system tries to keep it detecting the current temperature and controlling it using heater, cooler or compressor, etc.
It detects the current temperature, compares it with the reference temperature and generates an error signal. Then, based on this error signal, it controls the heating element (or cooling element). If the set temperature is more, the error signal is negative and vice versa.
So here I have given a temperature control system that detects the current temperature using the temperature sensor. It is compared to the set temperature set by external reference. Y indicates the error signal as positive or negative.
• If the error is positive, it means that the current temperature is more than the set temperature that has to be reduced
• If the error is negative it means that the current temperature is lower than the set temperature and it is necessary to increase it
Block diagram of the system:
![[Image: Image%201_1.jpg]](https://www.engineersgarage.com/sites/default/files/imagecache/Original/wysiwyg_imageupload/28714/Image%201_1.jpg)
As shown in the figure above, the main components of the system are the temperature sensor, analog-to-digital converter (ADC), microcontroller, LCD, clock generator and LED indicators.
Temperature sensor: It is a transducer. Gives the corresponding voltage output (or current) as a temperature change. It can be calibrated to degrees Celsius. Otherwise, it must be calibrated first.
Reference potentiometer: Sets the reference temperature between the minimum and maximum values. The operation of the system depends on this set temperature value.
ADC: Its analog-to-digital converter with built-in multiplexer. Two analog inputs are required from the temperature sensor and one from the reference potentiometer. Outputs the 8-bit digital output corresponding to the selected analog input. To obtain the digital output of any channel, the microcontroller will select the required channel and take the digital output.
Clock generator: ADC requires clock signal for its operation. This clock signal is generated by a clock generator based on IC555.
Micro controller: controls the operation of ADC and LCD. Take the digital output of both channels and display them on the LCD. Make the right decision by comparing two temperatures. It also gives different indications about LEDs
LED indicators: shows different indications like
![[Image: Image%203_2.jpg]](https://www.engineersgarage.com/sites/default/files/imagecache/Original/wysiwyg_imageupload/28714/Image%203_2.jpg)
