05-04-2012, 12:15 PM
BICYCLE INDICATOR
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ACKNOWLEDGEMENT
The satisfaction that accompanies the successful completion of any task would be incomplete without the mention of the people who made it possible and whose constant guidance and encouragement crown all the efforts with success.
It is my proud privilege to express deep sense of gratitude, regards an appreciation to my guide Mr. JANAK KAPOOR (Asst. Professor,I.E.T.,M.J.P.R.U.) for his valuable guidance, deep rooted interest, inspiration and continuous encouragement which helped me to complete my product designing successfully. I am blissful to pay my regards for all moral support he provided to me at every stage of designing.
I am grateful to those who have directly or indirectly helped me during the project work. Finally, I express my heartfelt gratefulness to my parents, teachers and friends for their wishes and contributions towards carrying out this endeavor.
INTRODUCTION
The electronic bicycle signaling unit described here uses low-cost components and is a good substitute to many commercially available versions. It works in an extremely different manner and is convenient to operate.
It works as helping device when we are driving on the road. As in bycycle, there is no indicator to show the direction of motion so this device could give important role.
The device can be fit on the other vehicals which not have such system to give the direction.
Bicycle indicator has some features are given below-
1. Left indicator
2. Right indicator
3. Emergency indicator
CONSTRUCTION OF THE CIRCUIT
The circuit works off a 9V PP3 (alkaline-type) battery and is basically a set of two independent free-running oscillators (astable multivibrators) built around four low-power transistors and a few passive components. Both the square-wave oscillators (one built around T1 and T2 and the other built around T3 and T4) drive four red LEDs (LED1 and LED2, and LED5 and LED6, respectively), which blink to indicate the direction of turn. Additional steady-glow LEDs (LED3 and LED4) are incorporated to indicate the working status.
WORKING OF THE CIRCUIT
The working of the circuit is straightforward. When switch S1 is flipped to 'on' position, DC supply from the battery is extended to the oscillator circuit formed by transistors T1 and T2. Now the left-side oscillator starts oscillating and the visual indicators at the front left (FL) and rear left (RL) start blinking at a rate determined by timing capacitors C1 and C2. Resistors R2 and R3 limit the operating current of LEDs (LED1 and LED2). At the same time, the green LED (LED3) starts glowing to indicate the present direction status.
Similar action happens in the next oscillator circuit built around transistors T3 and T4 when switch S2 is flipped to 'on' position. Indicators at the front right (FR) and rear right (RR) start blinking, and at the same time the green LED (LED4) glows to indicate the direction status.
Switch S3 is used for emergency indication get power supply through diodes D1 and D2. As a. When it is flipped to ‘on’ position, both the oscillators result, LED1 through LED6 start working simultaneously. In this condition, all the LEDs blink, except LED3 and LED4, which glow steadily.