« previous next »
Pages: 1

Author Topic: What's wrong?  (Read 4773 times)

imusik21

  • Guest
on: April 22, 2008, 10:28:13 PM
i made my pen like this:
              _______
        /- (AAbattery}+-------(switch)----------(IR LED)-\
        |                                                                           |
        |                                                                           |
         \---(resistor)-----------------------------------------/

so whats wrong, why isnt it working?
« Last Edit: April 22, 2008, 11:02:11 PM by imusik21 »


Offline ZaPPZion

  • *
  • Posts: 137
  • Karma: +11/-1
    • View Profile
Reply #1 on: April 23, 2008, 06:17:38 AM
the IR Led has a polarity. You need to connect the + to the long pin, and the - to the shorter pin (ofcourse with a resistor).


Offline UndCon

  • Support Admin
  • *
  • Posts: 566
  • Karma: +11/-3
    • View Profile
    • UndCon
Reply #2 on: April 23, 2008, 07:13:21 AM
verify by mounting a regular visible led that your circuit is working

when 100% sure... mount IRled the same way (poliarity)
verify by cellphone camera on digital camera or handycam that your IRled works


imusik21

  • Guest
Reply #3 on: April 23, 2008, 07:42:14 PM
hey thanks but i got it working like 5 minutes after i posted this it worked ok then i took off the resistor and it was much stronger so...ya thanks though


Offline Xin

  • *
  • Posts: 3
  • Karma: +0/-0
    • View Profile
Reply #4 on: April 24, 2008, 03:13:11 AM
Quote from: ZaPPZion on April 23, 2008, 06:17:38 AM
the IR Led has a polarity. You need to connect the + to the long pin, and the - to the shorter pin (ofcourse with a resistor).
+ => long pin  ?????
- => shorter pin ?????

Are you sure?


Offline ZaPPZion

  • *
  • Posts: 137
  • Karma: +11/-1
    • View Profile
Reply #5 on: April 24, 2008, 05:27:40 AM
yea, wiki:


Offline UndCon

  • Support Admin
  • *
  • Posts: 566
  • Karma: +11/-3
    • View Profile
    • UndCon
Reply #6 on: April 24, 2008, 11:35:28 AM
Nice you got it working...but beware if you are using 1.5volt batteries and the IRled is stated at 1.2volt then you still need a resistor or you will destroy the IRled


verify with the ledcalculator

http://ledcalculator.net


Pages: 1
« previous next »