Electronic Instrumentation & PLC DKT 314 - PowerPoint PPT Presentation

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  1. Electronic Instrumentation & PLCDKT 314 Digital thermometer LCD display using LM35 Lecturer: En Mat Nor Mohamad B Ismail En Zulkifli Husin

  2. SYNOPSIS • Digital thermometer designed for measuring temperature in three scales (Fahrenheit Celsius and Kelvin ) • Temperature was measured by LM35DZ • The 0804 analog to digital converter (ADC), convert the dc output provided by LM35D and sends to microcontroller (AT89S52) • The program write in C language • Microcontroller read binary output from the A/D converter, performs ASCII code, and sends to a 16x2 line LCD display

  3. OBJECTIVE • Ability to apply the basic concept of electronic instrumentation • Ability to under stand the basic concept of electronic instrumentation • Ability to integrate basic sensor temperature circuit and LCD display with 8051

  4. BLOG DIAGRAM LM35 FILTER AMP ADC 8051 Display

  5. PART 1 –LM35 Voltage increase 10mV/ ⁰C supply voltage 5V

  6. PART 2- FILTER LOW PASSFILTER Vout=1/2∏RC R=100kΩ,C=0.002mF Vout=795.77Hz

  7. PART 3- AMPLIFIER Gain = 1+(R2/R1) R1=10kΩ,R2=10Ω Gain= 1.001

  8. PART 4 –ADC 0804 Vref=not connected Step size=19.53mV Vout= Vin/ Step size

  9. Full Schematic Diagram

  10. PROBLEMS • Amplifier – the theoretical not equal to practical amplifier • Uneasy to stable the temperature value. • To find the best filter for the project.

  11. CONCLUTION • Objective for this project has archive. • Learn the basic of electronic instrumentation • This project can control anything that use this system.