Automatic Bike Light Circuit

This is a fast blinking led bike light circuit for safety when the bike at night.

Automatic bike light circuit.

We take the four leds to parallel. T his automatic bicycle light makes cycling in the dark much easier although you still need to pedal of course. The circuit of automatic night light takes ac power supply as its power input. Bike turning signal circuit principle.

The objective of this circuit is to indicate left or right turn for bike vehicle. Here is a similar circuit which uses ldr and transistors to switch the lamp during night time. The circuit is based on the renowned timer chip lm555 ic1 here triggered by a decrement in ambient light level. Here this 555 timer acts as an astable multi vibrator.

The light is turned off when no cycling has taken place for over a minute or if it becomes light again. Four 1n4007 diode makes up this full wave bridge rectifier. The circuit takes the ambient light level into account and only turns on the light when it becomes dark. But consider that being seen from the front is important for safety as well.

Stuff like watering your plants putting your phone in silent mode during a meeting and locking the bathroom door plants may die colleagues may glare and the embarrassment of bathroo. Because of each led use voltage about 3 4 5v we want this circuit for a long time using so use the led voltage is 3v only. The main component of this circuit is the infamous 555 timer ic. A 330nf capacitor in the circuit drops the voltage of the ac supply.

I am in my last semester of physics so i have some experience in building circuits and the general theory behind how many of the electronic components in a circuit work. It s funny how small things sometimes can be so hard to remember. Circuit diagram working explanation. Improved bike headlight switch circuit presented here has been designed to switch bike headlight on or similar loads at a presettable ambient light level.

The light is turned off when no cycling has taken place for over a minute or if it becomes light again. A rear blinker light is a good place to start if you don t have lights now and ride only in daylight. Automatic night lamp circuit night lamp circuits generally employ ldr to sense the light in the environment and turn on the light based on light intensity. We use two npn pnp transistor oscillator circuit and rc circuit only show on 4 leds use low current.

I want to build an automatic bike light that detects when it is dark and when i am moving so i don t have to turn it on or off. Here is a 220v automatic light switch just in case you need one. However i don t have much. Furthermore the voltage coming from the capacitor is rectified by the full wave rectifier circuit.