The document outlines an experiment focused on interfacing a temperature sensor (LM335) with the ADC 0809 and an 8051 microcontroller to display temperature readings on an LCD. It details objectives, features of the LM335 sensor, and expected learning outcomes, including programming in 'C' for data display. The LM335 sensor is noted for its precision, linear output, and suitability for a wide temperature range.

1. 1
Experiment No. 4
PROBLEM DEFINITION: To display the temperature
sensor output from ADC 0809 on the LCD

2. 2
Objectives of the Experiment:
1. To demonstrate the interfacing of ADC 0809 and
Temperature Sensor LM335 with 8051
Microcontroller.
2. To develop an 8051 ‘C’ code to display the ADC
output on LCD

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Department of Computer Science and Engineering, GIT 3
INTRODUCTION TO ADCs

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Department of Computer Science and Engineering, GIT 4
ADC 0808/09

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Department of Computer Science and Engineering, GIT 5
ADC 0808/09

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Department of Computer Science and Engineering, GIT 6
STEPS TO PROGRAM THE ADC
0808/09

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Department of Computer Science and Engineering, GIT 7
Temperature Sensor –LM335
 LM335 series are precision, easily-calibrated, integrated circuit
temperature sensors.
 Operating as a 2-terminal Zener, the LM335 has a breakdown voltage
directly proportional to absolute temperature at 10 mV/°K. With less than
1 Ω dynamic impedance, the device operates over a current range of
400 µA to 5 mA with virtually no change in performance. When calibrated
at 25°C, the LM335 has typically less than 1°C error over a 100°C
temperature range. Unlike other sensors, the LM335 has a linear output.
 Applications for the LM335 include almost any type of temperature sensing
over a -40°C to +100°C temperature range. The low impedance and linear
output make interfacing to readout or control circuitry are especially easy.

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Department of Computer Science and Engineering, GIT 8
Temperature Sensor –LM335
Features
 Directly calibrated to the Kelvin temperature scale
 1°C initial accuracy available
 Operates from 400 µA to 5 mA
 Less than 1 Ω dynamic impedance
 Easily calibrated
 Wide operating temperature range
 200°C over-range
 Low cost

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Department of Computer Science and Engineering, GIT 9
Interfacing block diagram

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Department of Computer Science and Engineering, GIT 10
Connection Details
 CN1- CN14
 CN2- CN13
 CN3- CN6

11. Department of Computer Science and Engineering, GIT 11
Course Learning Outcomes
At the end of the session, students should be able
to
 Interface ADC 0809 and Temperature sensor LM
335 with 8051 Microcontroller.
 Develop an Embedded ‘C’ program to read
temperature from the sensor LM 335, send it to
ADC and display the converted data on LCD of
8051 Microcontroller
02/03/2025