I should know how to do this but I have not played with my arduinos for some time and I seam to have forgot….. Well on with the question !!!!! …. I have a barcode scanner hooked up to my arduino and with this sketch it reads barcode’s and prints the value to the screen . How do I get it to recognise a barcode that I have already put in the code
Eg if barcode reads 1234567 Serial.println" barcode in database"
/*
Barcode Scanner
This code reads the input from a ps/2 keyboard or keyboard-like
device (e.g. a barcode scanner), translates the scan-codes into
numbers (only numbers from 0 to 9 can be used at the moment)
It is nowhere near a complete implementation of the ps/2 protocol,
but it should give you a starting point.
mys .// Benjamin Maus ( benjamin.maus <at> allesblinkt.com )
2007
*/
int SCAN_ENTER = 0x5a; int SCAN_BREAK = 0xf0;
int breakActive = 0;
int clockPin = 3; // Clock is only output.
int dataPin = 2; // The data pin is bi-directional
// But at the moment we are only interested in receiving
int ledPin = 13; // When a SCAN_ENTER scancode is received the LED blink
int clockValue = 0; byte dataValue;
byte scanCodes[10] = {0x45,0x16,0x1e,0x26,0x25,0x2e,0x36,0x3d,0x3e,0x46}; char characters[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
int quantityCodes = 10;
char buffer[64] = {}; // This saves the characters (for now only numbers)
int bufferPos = 0;
int bufferLength = 64;
void setup() {
pinMode(dataPin, INPUT);
pinMode(clockPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
dataValue = dataRead();
// If there is a break code, skip the next byte
if (dataValue == SCAN_BREAK) {
breakActive = 1;
}
// Translate the scan codes to numbers
// If there is a match, store it to the buffer
for (int i = 0; i < quantityCodes; i++) {
byte temp = scanCodes[i];
if(temp == dataValue){
if(!breakActive == 1){
buffer[bufferPos] = characters[i];
bufferPos++;
}
}
}
//Serial.print('*'); // Output an asterix for every byte
// Print the buffer if SCAN_ENTER is pressed.
if(dataValue == SCAN_ENTER){
Serial.print("\nbuffer: ");
// Read the buffer
int i=0;
if (buffer[i] != 0) {
while(buffer[i] != 0) {
Serial.print( buffer[i] );
buffer[i] = 0;
i++;
}
}
Serial.println(" [Enter]");
bufferPos = 0;
// Blink the LED
digitalWrite(ledPin, HIGH);
delay(300);
digitalWrite(ledPin, LOW);
}
// Reset the SCAN_BREAK state if the byte was a normal one
if(dataValue != SCAN_BREAK){
breakActive = 0;
}
dataValue = 0;
}
int dataRead() {
byte val = 0;
// Skip start state and start bit
while (digitalRead(clockPin)); // Wait for LOW.
// clock is high when idle
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
for (int offset = 0; offset < 8; offset++) {
while (digitalRead(clockPin)); // Wait for LOW
val |= digitalRead(dataPin) << offset; // Add to byte
while (!digitalRead(clockPin)); // Wait for HIGH
}
// Skipping parity and stop bits down here.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
return val;
}
maddave:
How do I get it to recognise a barcode that I have already put in the code
Eg if barcode reads 1234567 Serial.println" barcode in database"
You would put the barcodes to be recognized into a list and compare the barcode received to each of the ones in the list. If you find a match, print "barcode in database".
The dataRead() function gets one value, which is then used to determine what to store in buffer.
Once dataRead() returns a SCAN_ENTER, it is the value in buffer that needs to be compared to values in a list. Since buffer is a char array, and is NULL terminated, use strcmp() to compare buffer to known strings.
Where have you defined the names/values of the barcodes that you want to check the scanned on against? That is the (global) array that I called goodCards. If you have another name, we can use that instead.
if i understand you your asking for a list of coodcard bar code's
I was asking if you had created an array of such values in your code. If not, you can modify goodCards and use those values:
char *goodCards = { "3455192327218", "4005209057240", "5060048310337" };
thnaks for all you help but this is what i have and if is not working
de Scanner
This code reads the input from a ps/2 keyboard or keyboard-like
device (e.g. a barcode scanner), translates the scan-codes into
numbers (only numbers from 0 to 9 can be used at the moment)
It is nowhere near a complete implementation of the ps/2 protocol,
but it should give you a starting point.
mys .// Benjamin Maus ( benjamin.maus allesblinkt.com )
2007
*/
char *goodCards = { "3455192327218", "4005209057240", "5060048310337" };
int SCAN_ENTER = 0x5a; int SCAN_BREAK = 0xf0;
int breakActive = 0;
int clockPin = 3; // Clock is only output.
int dataPin = 2; // The data pin is bi-directional
// But at the moment we are only interested in receiving
int ledPin = 13; // When a SCAN_ENTER scancode is received the LED blink
int clockValue = 0; byte dataValue;
byte scanCodes[10] = {0x45,0x16,0x1e,0x26,0x25,0x2e,0x36,0x3d,0x3e,0x46}; char characters[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
int quantityCodes = 10;
char buffer[64] = {}; // This saves the characters (for now only numbers)
int bufferPos = 0;
int bufferLength = 64;
void loop() {
dataValue = dataRead();
// If there is a break code, skip the next byte
if (dataValue == SCAN_BREAK) {
breakActive = 1;
}
// Translate the scan codes to numbers
// If there is a match, store it to the buffer
for (int i = 0; i < quantityCodes; i++) {
byte temp = scanCodes*; *
if(temp == dataValue){ *
if(!breakActive == 1){ *
_ buffer[bufferPos] = characters*; _
_ bufferPos++; _
_ } _
_ } _
_ } _ _ //Serial.print(''); // Output an asterix for every byte * // Print the buffer if SCAN_ENTER is pressed.
if(dataValue == SCAN_ENTER){
_ Serial.print("\nbuffer: "); * * // Read the buffer * int goodMatch = -1; for(int c=0; c<cardCnt; c++) { * if(strcmp(buffer, goodCards* ```c *) == 0)
{
goodMatch = c;
break;
}
}
Serial.print("goodMatch = ");
Serial.println(goodMatch); // Will print index of good card in array
int i=0;
if (buffer[i] != 0) {
while(buffer[i] != 0) {
Serial.print( buffer[i] );
buffer[i] = 0;
i++;
}
}
Serial.println(" [Enter]");
bufferPos = 0;
// Blink the LED
digitalWrite(ledPin, HIGH);
delay(300);
digitalWrite(ledPin, LOW);
}
int goodMatch = -1;
Serial.print("goodMatch = ");
Serial.println(goodMatch); // Will print index of good card in array// Reset the SCAN_BREAK state if the byte was a normal one
if(dataValue != SCAN_BREAK){
breakActive = 0;
}
dataValue = 0;
}
int dataRead() {
byte val = 0;
// Skip start state and start bit
while (digitalRead(clockPin)); // Wait for LOW.
// clock is high when idle
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
for (int offset = 0; offset < 8; offset++) {
while (digitalRead(clockPin)); // Wait for LOW
val |= digitalRead(dataPin) << offset; // Add to byte
while (!digitalRead(clockPin)); // Wait for HIGH
}
// Skipping parity and stop bits down here.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
return val;
}
[/quote]*
The code IS working. It just isn't producing the results you are expecting, but, right now, we don't know what results it produces, or what you are expecting.
Please use the # icon, and code tags, not the quote icon and quote tags, when posting code, so the forum software doesn't try to interpret stuff in your code as fonting information.
/*
Barcode Scanner
This code reads the input from a ps/2 keyboard or keyboard-like
device (e.g. a barcode scanner), translates the scan-codes into
numbers (only numbers from 0 to 9 can be used at the moment)
It is nowhere near a complete implementation of the ps/2 protocol,
but it should give you a starting point.
mys .// Benjamin Maus ( benjamin.maus <at> allesblinkt.com )
2007
*/
char *goodCards = { "3455192327218", "4005209057240", "5060048310337" };
int SCAN_ENTER = 0x5a; int SCAN_BREAK = 0xf0;
int breakActive = 0;
int clockPin = 3; // Clock is only output.
int dataPin = 2; // The data pin is bi-directional
// But at the moment we are only interested in receiving
int ledPin = 13; // When a SCAN_ENTER scancode is received the LED blink
int clockValue = 0; byte dataValue;
byte scanCodes[10] = {0x45,0x16,0x1e,0x26,0x25,0x2e,0x36,0x3d,0x3e,0x46}; char characters[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
int quantityCodes = 10;
char buffer[64] = {}; // This saves the characters (for now only numbers)
int bufferPos = 0;
int bufferLength = 64;
After this:
void setup() {
pinMode(dataPin, INPUT);
pinMode(clockPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
dataValue = dataRead();
// If there is a break code, skip the next byte
if (dataValue == SCAN_BREAK) {
breakActive = 1;
}
// Translate the scan codes to numbers
// If there is a match, store it to the buffer
for (int i = 0; i < quantityCodes; i++) {
byte temp = scanCodes[i];
if(temp == dataValue){
if(!breakActive == 1){
buffer[bufferPos] = characters[i];
bufferPos++;
}
}
}
//Serial.print('*'); // Output an asterix for every byte
// Print the buffer if SCAN_ENTER is pressed.
if(dataValue == SCAN_ENTER){
Serial.print("\nbuffer: ");
// Read the buffer
int goodMatch = -1;
for(int c=0; c<cardCnt; c++)
{
if(strcmp(buffer, goodCards[c]) == 0)
{
goodMatch = c;
break;
}
}
Serial.print("goodMatch = ");
Serial.println(goodMatch); // Will print index of good card in array
int i=0;
if (buffer[i] != 0) {
while(buffer[i] != 0) {
Serial.print( buffer[i] );
buffer[i] = 0;
i++;
}
}
Serial.println(" [Enter]");
bufferPos = 0;
// Blink the LED
digitalWrite(ledPin, HIGH);
delay(300);
digitalWrite(ledPin, LOW);
}
int goodMatch = -1;
for(int c=0; c<cardCnt; c++)
{
if(strcmp(buffer, goodCards[c]) == 0)
{
goodMatch = c;
break;
}
}
Serial.print("goodMatch = ");
Serial.println(goodMatch); // Will print index of good card in array// Reset the SCAN_BREAK state if the byte was a normal one
if(dataValue != SCAN_BREAK){
breakActive = 0;
}
dataValue = 0;
}
int dataRead() {
byte val = 0;
// Skip start state and start bit
while (digitalRead(clockPin)); // Wait for LOW.
// clock is high when idle
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
for (int offset = 0; offset < 8; offset++) {
while (digitalRead(clockPin)); // Wait for LOW
val |= digitalRead(dataPin) << offset; // Add to byte
while (!digitalRead(clockPin)); // Wait for HIGH
}
// Skipping parity and stop bits down here.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
while (digitalRead(clockPin)); // Wait for LOW.
while (!digitalRead(clockPin)); // Wait for HIGH.
return val;
}