EET-126-Lab-5-Jeewan-and-Inam

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Centennial College *

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126

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Electrical Engineering

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Apr 3, 2024

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INAM BHUSAL- 301320640 JEEWAN PARAJULI - 301320619 Lab 5: Temperature Measurement Using a Thermistor Overview In this lab, you will use an LCD display and a thermistor to measure and display temperature. You will also learn about reading datasheets and finding relevant information about devices that you will need to use. Components Required (1) x Elegoo Uno R3 (1) x LCD1602 Module (1) x 10k ohm resistor (1) x Thermistor (1) x Potentiometer (1) x 830 tie-points Breadboard (18) x M-M wires (Male to Male jumper wires)

Theory A thermistor is a thermal resistor - a resistor that changes its resistance with temperature. Technically, all resistors are thermistors - their resistance changes slightly with temperature - but the change is usually very small and difficult to measure. Thermistors are made so that the resistance changes drastically with temperature. It can be 100 Ohms or more, per degree of change. There are two kinds of thermistors, NTC (negative temperature coefficient) and PTC (positive temperature coefficient). In general, you will see NTC sensors used for temperature measurement. PTC's are often used as resettable fuses - an increase in temperature increases the resistance which means that as more current passes through them, they heat up and 'choke back' the current, quite handy for protecting circuits! Experiment We will be using the NTC thermistor in your kit, the Arduino board and the seven segment display connected as shown below. Fig 1: Pictorial Schematic of NTC thermistor sensor with Arduino UNO

The schematic view of the setup is shown below showing you the orientation of the pins. Fig 2: Pictorial Schematic of NTC thermistor sensor with Arduino UNO Once your circuit is setup, you must load the library for the 7-segment display. This is a zip file and you can add it as you did for Lab 4. Then compile the code that you are given to display the temperature. You must complete the code to calculate the temperature in Celsius and Fahrenheit. Also modify the code to display your name on the LCD screen. You should be able to do this by looking at the code provided for displaying the temperature.

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Experiment and Discussion 1. Reading datasheets for different sensors is very important in understanding the details of the sensor and its capabilities. For the NTC thermistor, look at the datasheet (provided) and answer the following questions: a) What is the name of the company that manufactures this device? - Focusens b) What is the temperature range of this device?- -55°C to +125°C c) The datasheet is in fact for several different versions of the devices. This is actually very common in kits. Which specific version of the device do you have in your kit based on the information in the datasheet? -V 1.0 1. As the NTC sensor is exposed to the air, record the temperature. This is known as the ambient temperature. Temperature in Celsius Temperature in Fahrenheit Temperature in Kelvins Ambient Temperature 24.88 76.79 298.03 2. Now hold the NTC resistor between two of your fingers (your index finger and thumb are the best choice). What happens to the temperature? Record this new temperature. Temperature in Celsius Temperature in Fahrenheit Temperature in Kelvins Body Temperature 32.68 90.82 305.83 3. Release your thumb and finger and let the temperature go back down to the ambient temperature. Now hold the NTC thermistor with your fingers again and approximate how long it takes for the temperature to change to the value in Step 2. Record this time. = 20 second 4. Temperature change is not instantaneous. This is know as the response time of the sensor. On the datasheet for the sensor, you will notice that there is a Response Time rating. This is shown below. Investigate what the above statement. What does it mean? Does your measurement change time in step 4 match the above?

The statement indicates that temperature sensors don't immediately register temperature changes; instead, they have a response time. This response time is the duration it takes for the sensor to accurately reflect a temperature change. The measurement change time in step 4 should ideally match the response time specified in the sensor's datasheet . Deliverables 1. Answer all question provided in the discussion. You can write your answers on a piece of paper and take a picture of your answer and neatly paste it in the document where appropriate. Otherwise, you can fill out the tables directly in the document. 2. Take a picture of your setup in part 1 with ambient temperature and your name showing on the LCD screen and include the picture in your lab report.