RFID based toll system

[raghavendra]

sir,

    I am trying practically to implement the project in this site called”simple toll plaza system using rfid ,keypad and 89c51 , I have compiled the code which was mentioned in the same in keil microvision software and it got compiled successfully and also I dumped the source pgm in 89c51 and tried it on hyper terminal evertthing worked perfectly but when i interfaced it with rfid module and rest of the circuit it isn’t working , the problem is ,it shows scan id , after we scan and if we press keypad for our requirement either to recharge or to register the new id ,the key which is pressed is taken multiple times on the lcd and thats it ,it doesnt work further, plz give me a solution whether to implement thre project in your site needs specified rfid reader or what  ? kindly refer “simple toll plaza system ” project in 8051 projects in engineersgarage and let me know the answer thank u.

[AJISH ALFRED]

Hi Raghavendra,

Sorrry for the delayed response. The trouble starts when you press a key right? There is no check for key debounce in that code. If you use keys with long bouncing time this code may crash. From your post I make out that could be the probelm, to confirm modify the code slightly as shown below and try again.

 

Inside the while (1) loop of the main() function

 

 

 

while(1)

{

row1=row2=row3=row4=0;

if(col1==0)

{ //*****add these lines**********//

delay_ms(30)           //add a 30 millisecond delay and check the key again

if (col1==0)

keypad();

else;

}

 

[raghavendra]

Thanks for the reply sir ,i tried it your way and got the expected output.

once again thank u

                             Regards,

                             Raghavendra

[AJISH ALFRED]

My pleasure.

[Prabin shrestha]

How to get ID of RFID tag and compare?

and how to store the ID in the memory of the 89c51?

plz help me

 

[alok]

Sir kindly tell me which RFID you are using in this project? Is there any specific name I have to mention to the electronics shop or should i just ask for a rfid module? Plz help…

 

Regards,

Alok Srivastav

[kailey jazyln]

Dear Sir,

              i implement Toll plaza system based on vehicle category interface with 8051 microcontroller i have some hardware issues all the codes are work fine great work when i enter the vechicle category section for pressing 1 or 2  the keypad sometimes read otherwise proceed next section showing blank screen for entering amount when i entered amount it took the amount in spacing or sometimes empty screen same as vechicle category section selection * for erasing amount also give problem then i pressed # it takes garbage value e.g 31326 . Sir please give me solution to this problem or mail me the correct code if possible .

[Author]

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