27-02-2013, 03:25 PM
Automatic Toll Tax
Automatic Toll Tax.docx (Size: 100.72 KB / Downloads: 21)
Automatic toll tax project is designed ,using atmel 89c51 microcontroller & descreate componants. Heart of the project is an ir transmitter and receiver modules ,these strong powerfull modules transmits 38khz strong ir beam, has a range of more than 15 feets are sufficiently enough for our project. I have designed this project as a simple emplementation of the toll collection process automatically in a model form.
Automatic Toll Tax Block Diagram
Automatic Toll Tax Representation
This should not be considered as a real toll collection system which require much more considerations , tests and huge amount of money, before they are actually put into use.
However this project gives enough guidelines for the actual dvelopment of the toll collection system. For the sake of simplicity , we have to make coin box exactly same as used in pco coin box machine fixed on railway station or else whare. We have to make two coin size holes one for one rupee, and other for five rupee coin. You have to fixup coin sensors on these holes, one sensor should be fixed for five rupee coin and one sensor for one rupee coin.
Operation of the coin sensor is as follows
1) When no coin is incerted light emitting diodes throws light on ldr and its resistance remains low
2) When coin is inserted,the resistance of the ldr becomes high and transister(q1 or q2) get enough biasing voltage and becomes ON ,there output at collector becomes low. As the coin is dropped in,,the out put of the collector again goes high,
3) Output of these transisters are connected to p2.5 and p2.7 pin of the microcontroller and low pulse is detected by the microcontroller whenever the coin is dropperd
This low pulse detection is considered as coin has been dropped.
In real emplementation, this type of sensors cannot be used ,more sensitive equipments