Sample LM 35 Electronic INstrumenatation
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Transcript of Sample LM 35 Electronic INstrumenatation
Electronic Instrumentation & Electronic Instrumentation & PLCPLC
DKT 314DKT 314
Digital thermometer LCD display using LM35
Lecturer: En Mat Nor Mohamad B Ismail
En Zulkifli Husin
SYNOPSISSYNOPSISDigital thermometer designed for
measuring temperature in three scales (Fahrenheit Celsius and Kelvin )
Temperature was measured by LM35DZThe 0804 analog to digital converter
(ADC), convert the dc output provided by LM35D and sends to microcontroller (AT89S52)
The program write in C languageMicrocontroller read binary output from
the A/D converter, performs ASCII code, and sends to a 16x2 line LCD display
OBJECTIVEOBJECTIVEAbility to apply the basic concept of
electronic instrumentationAbility to under stand the basic
concept of electronic instrumentation
Ability to integrate basic sensor temperature circuit and LCD display with 8051
BLOG DIAGRAMBLOG DIAGRAM
LM35 FILTER AMP ADC
8051
Display
PART 1 –LM35PART 1 –LM35
-Voltage increase 10mV/ ⁰C-supply voltage 5V
PART 2- FILTERPART 2- FILTER
LOW PASSFILTERVout=1/2∏RC
R=100kΩ,C=0.002mFVout=795.77Hz
PART 3- AMPLIFIERPART 3- AMPLIFIER
Gain = 1+(R2/R1)R1=10kΩ,R2=10Ω
Gain= 1.001
PART 4 –ADC 0804PART 4 –ADC 0804
Vref=not connectedStep size=19.53mVVout= Vin/ Step size
Full Schematic DiagramFull Schematic Diagram
PROBLEMSPROBLEMSAmplifier – the theoretical not equal
to practical amplifierUneasy to stable the temperature
value.To find the best filter for the
project.
CONCLUTIONCONCLUTIONObjective for this project has
archive.Learn the basic of electronic
instrumentationThis project can control anything
that use this system.