Upload
cooljunk
View
337
Download
25
Embed Size (px)
Citation preview
Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in Project-‐Making & Learning!
PHYSICS INVESTIGATORY PROJECT ON
TEMPERATURE SENSOR
Do you know how is the temperature maintained in 3D printers? Thermistors are used in the hot ends of 3D printers; they monitor the heat produced and allow the printer’s control circuitry to keep a constant temperature for melHng the plasHc filament. You can create a circuit using which you can sense as and when the temperature crosses above the threshold limit.
In this project, you will need a breadboard, a thermistor, two resistors, a transistor, an LED and a few connecHng wires. The connecHons are made such that one leg of the thermistor is connected to the base of the transistor and its other leg is connected to Vcc (posiHve/high voltage). The emiTer of the transistor and one end of the base resistor are grounded (negaHve/low voltage).
When the surface of the thermistor is exposed to heat, the LED starts glowing aVer a while. The LED turns OFF the moment the temperature of the thermistor falls below the threshold value. The circuit is designed such that the resistance of the thermistor is inversely proporHonal to the base voltage.
The thermistor used is a negaHve temperature coefficient (NTC) resistor. The reason why the LED glows is because when the thermistor is heated, its resistance decreases due to which the base voltage increases and point comes when the base-‐emiTer juncHon is forward biased. As a result the transistor turns on and an output current flows from its collector to the emiTer, making the LED glow.
Have a look at what we provide in our Project Kit!
CoolJunk is India's fastest growing DIY (do-‐it-‐yourself) kits company focused on project-‐based learning in science, engineering and technology. Having 20,000 users in India, US, Singapore, Middle East and New Zealand, the CoolJunk kits are known for quality, innovaHon and high producHon value. CoolJunk has been featured in naHonal and internaHonal journals including Wallstreet, Yourstory, Hindu Business Line, NextBigWhat and was tagged as the coolest Indian start-‐up in IAN Bootcamp-‐2011.
For more projects visit our website: CoolJunk
All tools and components in one box.
Step by step visual instrucHons
Detailed experiment theory
CoolJunkCoolJunkCoolJunk
Follow us on:
CoolJunk