multiple 28140 rfid readers problem with reading
TrickyTractor
Posts: 4
in Accessories
Hi,
I'm working on a program that uses multiple rfid readers at different locations to read rfid tags. I'm running into the problem that i can't get the two readers to work on one arduino mega or on two separate arduino unos. On the mega they work separately but as soon as i put in the 'enable' of the other reader it stops the reading for both of them. Here's my code for the mega, I would really appreciate your help
Greetings
I'm working on a program that uses multiple rfid readers at different locations to read rfid tags. I'm running into the problem that i can't get the two readers to work on one arduino mega or on two separate arduino unos. On the mega they work separately but as soon as i put in the 'enable' of the other reader it stops the reading for both of them. Here's my code for the mega, I would really appreciate your help
Greetings
Comments
int val = 0; char code[10]; int bytesread = 0; int i = 0; int myNum[10]; unsigned long int multArray[] = {1, 1, 268435456, 16777216, 1048576, 65536, 4096, 256, 16, 1 }; unsigned long int trueTag = 0; int countYellowW = 0; int countGreenW = 0; int countRedW = 0; int countYellowC = 0; int countGreenC = 0; int countRedC = 0; void setup() { // initialize both serial ports: Serial.begin(2400); Serial1.begin(2400); pinMode(2, OUTPUT); // Set digital pin 2 as OUTPUT to connect it to the RFID /ENABLE pin digitalWrite(2, LOW); // Activate the RFID reader pinMode(3, OUTPUT); // Set digital pin 3 as OUTPUT to connect it to the RFID /ENABLE pin digitalWrite(3, LOW); // Activate the RFID } void loop() { if (Serial.available() > 0) { // if data available from reader if ((val = Serial.read()) == 10) { // check for header bytesread = 0; while (bytesread < 10) { // read 10 digit code if ( Serial.available() > 0) { val = Serial.read(); if ((val == 10) || (val == 13)) { // if header or stop bytes before the 10 digit reading break; // stop reading } code[bytesread] = val; // add the digit bytesread++; // ready to read next digit } } if (bytesread == 10) { // if 10 digit read is complete code[0] = 48; //Zero out the first two elements of the code array code[1] = 48; //Cycle through the code array and create int elements in myNum for (i = 0; i < 10; i++) { if (code[i] == '0') //I am not a programmer, but this is the only way I could myNum[i] = 0; else if (code[i] == '1') //find to convert elements of a char array to ints... myNum[i] = 1; else if (code[i] == '2') myNum[i] = 2; else if (code[i] == '3') myNum[i] = 3; else if (code[i] == '4') myNum[i] = 4; else if (code[i] == '5') myNum[i] = 5; else if (code[i] == '6') myNum[i] = 6; else if (code[i] == '7') myNum[i] = 7; else if (code[i] == '8') myNum[i] = 8; else if (code[i] == '9') myNum[i] = 9; else if (code[i] == 'A') myNum[i] = 10; else if (code[i] == 'B') myNum[i] = 11; else if (code[i] == 'C') myNum[i] = 12; else if (code[i] == 'D') myNum[i] = 13; else if (code[i] == 'E') myNum[i] = 14; else if (code[i] == 'F') myNum[i] = 15; else myNum[i] = 9999; //Oops! an error } //With trueTag initialized to 0, create the true tag number by summing trueTag with each element of the //integer myNum array multiplied by the corresponding element of the multArray. for (i = 0; i < 10; i++) { trueTag = trueTag + (myNum[i] * multArray[i]); } if (trueTag == 3372093) { countYellowC++; if (countYellowC % 2 == 0) { Serial.print(3); } else { Serial.print(2); } } else if (trueTag == 3375172) { countGreenC++; if (countGreenC % 2 == 0) { Serial.print(9); } else { Serial.print(8); } } else if (trueTag == 3369475) { countRedC++; if (countRedC % 2 == 0) { Serial.print(6); } else { Serial.print(5); } } } bytesread = 0; trueTag = 0; //Zero out trueTag for next iteration of the loop digitalWrite(2, HIGH); //deactivate the RFID reader for a moment so it will not flood delay(2500); //wait for a bit digitalWrite(2, LOW); //Activate the RFID reader } } else if (Serial1.available() > 0) { if ((val = Serial1.read()) == 10) { // check for header bytesread = 0; while (bytesread < 10) { // read 10 digit code if ( Serial1.available() > 0) { val = Serial1.read(); if ((val == 10) || (val == 13)) { // if header or stop bytes before the 10 digit reading break; // stop reading } code[bytesread] = val; // add the digit bytesread++; // ready to read next digit } } if (bytesread == 10) { // if 10 digit read is complete code[0] = 48; //Zero out the first two elements of the code array code[1] = 48; //Cycle through the code array and create int elements in myNum for (i = 0; i < 10; i++) { if (code[i] == '0') //I am not a programmer, but this is the only way I could myNum[i] = 0; else if (code[i] == '1') //find to convert elements of a char array to ints... myNum[i] = 1; else if (code[i] == '2') myNum[i] = 2; else if (code[i] == '3') myNum[i] = 3; else if (code[i] == '4') myNum[i] = 4; else if (code[i] == '5') myNum[i] = 5; else if (code[i] == '6') myNum[i] = 6; else if (code[i] == '7') myNum[i] = 7; else if (code[i] == '8') myNum[i] = 8; else if (code[i] == '9') myNum[i] = 9; else if (code[i] == 'A') myNum[i] = 10; else if (code[i] == 'B') myNum[i] = 11; else if (code[i] == 'C') myNum[i] = 12; else if (code[i] == 'D') myNum[i] = 13; else if (code[i] == 'E') myNum[i] = 14; else if (code[i] == 'F') myNum[i] = 15; else myNum[i] = 9999; //Oops! an error } //With trueTag initialized to 0, create the true tag number by summing trueTag with each element of the //integer myNum array multiplied by the corresponding element of the multArray. for (i = 0; i < 10; i++) { trueTag = trueTag + (myNum[i] * multArray[i]); } if (trueTag == 3372093) { countYellowW++; if (countYellowW % 2 == 0) { Serial.print(2); } else { Serial.print(1); } } else if (trueTag == 3375172) { countGreenW++; if (countGreenW % 2 == 0) { Serial.print(8); } else { Serial.print(7); } } else if (trueTag == 3369475) { countRedW++; if (countRedW % 2 == 0) { Serial.print(4); } else { Serial.print(6); } } } bytesread = 0; trueTag = 0; //Zero out trueTag for next iteration of the loop digitalWrite(3, HIGH); //deactivate the RFID reader for a moment so it will not flood delay(2500); //wait for a bit digitalWrite(3, LOW); //Activate the RFID reader } } }Serial1.print
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