Electronic Circuits and Projects Forum

Thanks. I like posting here i get nice replies. And learn alot. I hope to get some writable tags and a tag writer. It would be a very fun idea. I think i would have tons of fun playing with it. I might get the range sensor from them soon. I have their PIR sensor.

EDIT

I just thought of something... Since i have the PIR sensor i might rig it to this so it enables the device when motion is sensed and disables it when no motion is sensed.

Nice idea Mike... That would be close to my variable idea. But with ROM instead. I was thinking about a external memory. I have a 256 Byte Memory (EEprom) from dipMicro
"256x8 bit EEPROM w/ 2-wire interface."

Since they are about $0.25 Cent (USD) I have 2 and they are cheap. I can store about 25 Keys in 1. And if need be can make a tiny eeprom board with a few.I can have 8 max. But heh its cheap. 8 for $2 and can store about 200 off PIC. Can also just get a small SD card like 32 MB and go nuts by making it internal and soldering directly on it i can make it permanent storage.

So space isnt a issue it more of which is more logical choice to use.

Internal Memory (ROM,RAM, EEPROM)
Extrernal Memory (SD,xEEprom,I2C mem, SPI mem)

So many choices. Then after making this choice i would have to code a way to save the data into the choice and read data from choice into a temp buffer and compare the buffer to the user data.

It seems easy just which is the best for this type of work. Since i will be reading the data from storage alot and checking against new user data. I think i should make some type of arrangement or hierarchy for the data. So i can organize it better and determine access for users and such. I will ultimately tie this into a LCD.

Just thought id post some crapy videos lol

The 1st video is the RFID in action.
The 2nd video is the RFID acting as a inductor.
The 3rd video is a LCD widget(module) i just made for this project. It has a 74LS164 on it and has a 5 wire interface.(1=5v,2=GND,3=data,4=clock,5=E(toggle))


Video 1:

Video 2:

Video 3:

Originally Posted by AtomSoft

Just thought id post some crappy videos lol

How about some crappy audio to explain what you're doing. All I see is your hands moving stuff around. No idea what's going on.

heh i have a messed up voice. Its scratchy today. So i doubt you would understand me talking anyway. Every since i took my tooth out i cought a fever and cold and felt like i almost died so .. im just waiting to fully heal Voice comes when i get a new camera.

Some new code. It can determine if a card is new and then add it to a available slot if any space is left. And can notify if no space in variable for new card or if card is old or already in system.

Code :

#include <p18f2525.h>
#include <stdio.h>
#include <string.h>
#include <delays.h>
#include <usart.h>
 
 
#pragma config WDT = OFF, LVP = OFF, OSC = INTIO67
/************************************
Prototypes
*************************************/
void main(void);
void delay_ms(int mS);
void delay_us(int uS);
void delay_s(int S);
char IsNew(char TheID);
char getSlot(void);
/************************************
Variables AND Defines
*************************************/
char MyID;
char tmp;
 
unsigned char sPosition;
 
unsigned char cards[100];
unsigned char tmpID[10];
unsigned char inputID[10];
 
#define RX_TRIS TRISCbits.TRISC7
#define BadLED LATCbits.LATC2
#define GoodLED LATCbits.LATC3
/************************************
Main
*************************************/
void main(void){
    char inputstr[12];
    char y,x;
 
	OSCCON = 0x72;      			//8MHz clock
	while(!OSCCONbits.IOFS);		//wait for osc stable
 
    y = x = 0;
    sPosition = 0;
 
    TRISA = TRISB = TRISC = 0;
    RX_TRIS = 1;
 
    OpenUSART(  USART_TX_INT_OFF  &
                USART_RX_INT_OFF  &
                USART_ASYNCH_MODE &
                USART_EIGHT_BIT   &
                USART_CONT_RX     &
                USART_BRGH_LOW,51);
 
    //Blank out variable
    for(y=0;y<100;y++){
        cards[y] = 0;
    }       
 
while(1){
loopit:
    getsUSART( inputstr, 12 );
    if(inputstr[0] != 0x0A) goto loopit;
 
    for(y=0;y<10;y++)
        inputID[y] = inputstr[y+1];
 
    for(y=0;y<12;y++)
        inputstr[y] = 0;
 
    if(IsNew(inputID) == 1){        //Card exist
        BadLED = 1;
        GoodLED = 0;
    } else {                        //Card is new
        BadLED = 0;
        GoodLED = 1;
        sPosition = getSlot();           
        if(sPosition == 0xFF){
            //No Slots Available for new data
        } else {
            for(x=0;x<10;x++)
                cards[sPosition + x] = inputID[x];
        }
    }
 
}
}
 
char IsNew(char TheID){
    char cCount,cPos;
    char x,y;
 
    for(cCount=0;cCount<10;cCount++){
        cPos = cCount * 10;
 
        for(x=0;x<10;x++){ 
            tmpID[x] = cards[cPos + x];
        }
 
        if(memcmp(tmpID,TheID,10) == 0)
            return 1;
    }
 
    return 0;
}
 
char getSlot(void){
    char cCount, cPos;
 
    for(cCount=0;cCount<10;cCount++){
        cPos = cCount * 10;
        if(cards[cPos] == 0) 
            return cPos;
    }
    return 0xFF;
}