Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Automatic Bicycle Light Circuit Report
02-11-2013, 09:08 PM,
#1
Automatic Bicycle Light Circuit Report

Automatic Bicycle Light Circuit

[attachment=50563]

ABSTRACT


T his automatic bicycle light makes cycling in the dark much easier (although you still need to pedal of course). The circuit takes the ambient light level into account and only turns on the light when it becomes dark. The light is turned off when no cycling has taken place for over a minute or if it becomes light again. The biggest advantage of this circuit is that it has no manual controls. This way you can never ‘forget’ to turn the light on or off. This makes it ideal for children and those of a forgetful disposition
To detect when the bicycle is used (in other words, when the wheels turn), the circuit uses a reed switch (S1), mounted on the frame close to the wheel. A small magnet is fixed to the spokes (similar to that used with most bicycle speedometers), which closes the reed switch once for every revolution of the wheel. Whilst the wheel turns, pulses are fed to the base of T1 via C1. This charges a small electrolytic capacitor (C2). When it is dark enough and the LDR there-fore has a high resistance, T2 starts conducting and the lamp is turned on. With every revolution of the wheel C2 is charged up again. The charge in C2 ensures that T2 keeps conducting for about a minute after the wheel stops turning. Almost any type of light can be connected to the output of the circuit.
Reply

Marked Tags: magnet bicycle light capacitor circuit,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread Author Replies Views Last Post
  COIN BASED MOBILE CHARGER full report seminar class 22 21,340 02-07-2015, 05:06 AM
Last Post: radhikam
  PYROELECTRIC FIRE ALARM REPORT project girl 3 161 01-18-2015, 06:36 AM
Last Post: zeydibnuedriS
  EAR BASED ATTENDANCE MONITORING SYSTEM REPORT study tips 1 268 12-19-2014, 05:30 AM
Last Post: radhikam
  8-by-8 Bit Booth Multiplier Report project girl 2 244 11-30-2014, 11:09 AM
Last Post: radhikam
Wink SOLID STATE SINGLE PHASING PREVENTER A Project report project girl 1 1,673 11-22-2014, 07:59 AM
Last Post: radhikam
  Multiple Transformers Oil Temperature Monitoring With Automatic Circuit Breaker study tips 8 3,226 11-14-2014, 06:16 AM
Last Post: radhikam
  AUTOMATIC STREET LIGHT CONTROL USING LDR PPT study tips 2 3,446 10-16-2014, 03:03 PM
Last Post: radhikam
  A PROJECT REPORT ON SOUND LEVEL METER WITH AUDIO ANNOUNCEMENT FOR LIBRARY study tips 2 1,204 10-01-2014, 05:02 PM
Last Post: radhikam
  AUTOMATIC NIGHT LAMP WITH MORNING ALARM REPORT study tips 1 4,802 09-24-2014, 08:40 PM
Last Post: radhikam
  Electronic Mail Box report project girl 3 522 09-19-2014, 08:43 PM
Last Post: radhikam

Forum Jump:


Users browsing this thread: 1 Guest(s)