MCA PPT MINI PROJECT with topic_Oberheat_Detector.pptx

A mini project on overheat detector

1. OVERHEAT DETECTOR MICROCONTROLLER AND APPLICATIONS Roll No. ADARSH SINGH 60 PRABAL TRIPATHI 65 SATYAM VISHWAKARMA 67 PRAVIN YADAV 68

2. WHAT IT DOES ? Whenever the temperature goes above a particular level (100°C ) the buzzer beeps and gives us an alert OVERHEAT DETECTOR

3. COMPONENTS Circuit Diagram LM35 Temperature Sensor ADC0804 Analog to Digital converter AT89C51 Microcontroller BC547 npn BJT CRYSTAL OSCILLATOR (12MHz) Resistor 10K Capacitor 150pF DC Voltage Source Buzzer

4. LM35 Temperature sensor LM35 used in basic configuration Temperature range of 2°C to 150°C in basic configuration Output voltage ranges from 20mV to 1500mV Output voltage increases by 10mV for each °C increase in temperature

5. ADC0804 Converts analog data from sensor to digital data Make CS’ & WR’ low (Reset State) Make WR’ (or CS’) high (Conversion starts) INTR’ pin becomes 0 (Conversion ends) Make CS’ & RD’ low, this will output data on D7-D0 pins. NOTE: When RD’ is low INTR’ is high automatically Vref /2 pin is connected to 1.28V to get resolution of 10mV

6. BLOCK DIAGRAM LM35 Temperature Sensor ADC 8051 BUZZER

7. CODE CLR P2.7 MOV P1,#0FFH REPEAT: LCALL AD_CONVERSION LCALL COMPARISON SJMP REPEAT AD_CONVERSION: SETB P3.6 CLR P3.5 CLR P3.4 SETB P3.4 HERE: JB P3.6,HERE CLR P3.3 MOV A,P1 MOV 40H,A SETB P3.3 RET COMPARISON: CLR C MOV A,40H SUBB A,#100 JNC B_ON CLR P2.7 SJMP OVER B_ON: SETB P2.7 OVER: RET END

8. LIMITATIONS Cannot measure temperature above 150°C & below 2°C . The Threshold Temperature can be changed by software means only.

9. THANK YOU