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Android Mobile and LM35 Temperature Sensor based Wireless Temperature Monitoring and Alarm System with ATmega16 and 7 Segment Display using HC-05 Bluetooth

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In this project, we will learn Android Mobile and LM35 Temperature Sensor based Wireless Temperature Monitoring and Alarm System with AVR ATmega16 Microcontroller and 7 Segment Display using HC-05 Bluetooth. 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 wirelessly from an Android Mobile using HC-05 Bluetooth and 4 multiplexed Common Anode 7-Segment Displays. Also, we will compare the temperature of the surrounding or material to which the LM35 temperature sensor is attached with a threshold value continuously and when the temperature of the surrounding or material to which the LM35 temperature sensor is attached is greater than the threshold value, alert signal is sent to buzzer and to Android Mobile wirelessly.

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 HC-05 Bluetooth through USART communication protocol. TThis HC-05 Bluetooth transmits the digital value of LM35 temperature sensor wirelessly to the bluetooth of the Android Mobile. The bluetooth of the Android Mobile receives the digital value of LM35 temperature sensor through an Android App called Bluetooth Terminal and displays it. Apart from Andoid Mobile, ATmega16 microcontroller will display the LM35 Temperature Sensor value in 4 multiplexed Common Anode 7-Segment Displays. Also, the ATmega16 microcontroller will compare the output of LM35 Temperature Sensor value with a threshold value(here the threshold value is 40 `C) continuously and when the LM35 Temperature Sensor output value is greater than the threshold value, at that time the ATmega16 microcontroller will send alert signal to buzzer and to Andoid Mobile wirelessly. After getting the alert signal, buzzer starts beeping and Android Mobile displays the alert signal in the Bluetooth terminal App.

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 Andoid Mobile, 7-Segment Displays and Buzzer.

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega16 1pc
AVR USB Programmer 1pc
LM35 Temperature Sensor 1pc
HC-05 Bluetooth Board 1pc
Quad 7-Segment Display Board 1pc
12V, 1A DC SMPS Adaptor 1pc
10 to 10 FRC Female to Female Connector 2pc
1 to 1 Connector-Female to Female 14pc

Circuit Diagram

Video

Downloads

Android Mobile and LM35 Temperature Sensor based Wireless Temperature Monitoring and Alarm System with ATmega16 and 7 Segment Display using HC-05 Bluetooth Project File
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