Electronic Instrumentation & PLCDKT 314 Digital thermometer LCD display using LM35 Lecturer: En Mat Nor Mohamad B Ismail En Zulkifli Husin
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
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
BLOG DIAGRAM LM35 FILTER AMP ADC 8051 Display
PART 1 –LM35 Voltage increase 10mV/ ⁰C supply voltage 5V
PART 2- FILTER LOW PASSFILTER Vout=1/2∏RC R=100kΩ,C=0.002mF Vout=795.77Hz
PART 3- AMPLIFIER Gain = 1+(R2/R1) R1=10kΩ,R2=10Ω Gain= 1.001
PART 4 –ADC 0804 Vref=not connected Step size=19.53mV Vout= Vin/ Step size
PROBLEMS • Amplifier – the theoretical not equal to practical amplifier • Uneasy to stable the temperature value. • To find the best filter for the project.
CONCLUTION • Objective for this project has archive. • Learn the basic of electronic instrumentation • This project can control anything that use this system.