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Physics Investigatory Project on Temperature Sensor

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Physics Investigatory Project on Temperature Sensor

  1. 1. Part of Made in India, Design Innovation Workshop,2015 A  Fresh  New  Experience  in   Project-­‐Making  &  Learning!
  3. 3. 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.
  4. 4. 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