For the arduino.cc googlers and because I get tired of reading the chest thumping bs, here is a working example; feel free to critique.
No interrupts and works perfectly.
/*
HID Site Code 868 with Card# 14062788
Binary String - 111011001001101011010010100110001001
First & last bit are Parity bits
1-1101100100110101101001010011000100-1
next 10 bits are site code; remaining is the Card#
1-1101100100-110101101001010011000100-1
Card# in HEX {D694C4}
1101 (13 - D)
0110 (6)
1001 (9)
0100 (4)
1100 (12-C)
0100 (4)
(4*16^0)+(12*16^1)+(4*16^2)+(9*16^3)+(6*16^4)+(13*16^5) = 14062788
*/
int bits_CARD = 36;
const int bits_SITE = 10;
const int bits_CARDid = 26;
char BINchar[36]; // = "111011001001101011010010100110001001";
char SITEchar[bits_SITE +1];
char CARDchar[bits_CARDid + 1];
bool READING;
int green = 10; //4; //Green Wire Input (or Weigand Data0)
int white = 11; //5; //White Wire Input (or Weigand Data1)
int relay = 12; // Pin Controlling Relay
int led = 13;
int data0;
int data1;
int bit_cnt;
const char* _rev = "Rev1";
long int lastMillis;
void setup(){
pinMode(green, INPUT); pinMode(white, INPUT);
pinMode(8, OUTPUT); digitalWrite(8,HIGH);
pinMode(led, OUTPUT);
Serial.begin(115200);
Serial.println("Booting...");
}
void loop(){
data0 = digitalRead(green); //Green Wire Input (or Weigand Data0))
data1 = digitalRead(white); //White Wire Input (or Weigand Data1))
if(data0==0){BINchar[bit_cnt] = '0'; bit_cnt ++;}
if(data1==0){BINchar[bit_cnt] = '1'; bit_cnt ++;}
if(data1==0 || data0 == 0){ lastMillis = millis(); READING = true;}
while(data0 == 0){data0 = digitalRead(green); }
while(data1 == 0){data1 = digitalRead(white); }
if(lastMillis + 250 < millis() && READING == true){ clearMem();}
} // End Loop
void clearMem(){
READING = false;
if(bit_cnt == bits_CARD){decodeBITS();}else{bit_cnt = 0; Serial.println("oops");}
bit_cnt = 0;
}
void decodeBITS(){
for(int i=0; i<bits_SITE; i++){
SITEchar[i]= BINchar[i+1];
}
for(int i= (bits_SITE+1); i<bits_CARD-1; i++){
CARDchar[i-(bits_SITE+1)]= BINchar[i];
}
SITEchar[bits_SITE] = '\0';
CARDchar[bits_CARDid] = '\0';
long int svalue = strtol(String(SITEchar).c_str(), NULL, 2);
Serial.println(svalue);
long int value = strtol(String(CARDchar).c_str(), NULL, 2);
Serial.println(value);
}
