Arduino barcode scanner

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07
Nov 2018

Arduino barcode scanner: connect OEM barcode scanners modules with Arduino microcontroller (MCU)

If you are using an Arduino microcontroller to develop your system, and you need a 1d/ 2d OEM barcode scanner module at the same time, then this article would be helpful for you:

Here we introduce how we connect the Arduino Uno microcontroller with RTscan OEM barcode scanner modules and make them work.

When we try to integrate an OEM barcode scanner with the Arduino microcontroller board, we would meet these problems:

  1. The OEM barcode scanner with 12pins TTL interface, but Arduino board without this connector, how can we connect them?
  2. Whatever OEM barcode scanners we choose, how can we control the barcode scanner by Arduino and also upload decoded data to the Ardunio system?

Read below and find how RTscan provides solutions for the above questions.

 

Contents

Part I: Introduction of Arduino UNO and RTscan OEM barcode scanner modules

Part II: Connection solutions

Part III: Get the OEM barcode scanner module work with the Arduino system /Arduino C++ sample code:

  1. For TTL-232 Communication& Python Sample code
  2. For USB CDC Communication
  3. For USB-HID keyboard simulation communication

Part VI: Video Demo

 

 

Part I: Introduction of Arduino UNO and RTscan barcode scanners

Arduino UNO:

The UNO is the most used and documented board of the whole Arduino microcontrollers family, many people choose this model for their projects. Arduino Uno has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, and ICSP header, and a reset button. It contains everything needed to support the microcontroller.

 

Arduino UNO Pinout

And for our application to connect with the OEM barcode scanner, we need the 5.0v power supply pin, and GND pin, RXD, TXD pins.

 

RTscan OEM barcode scanners:

They all with 12pins connector and TTL signal, and use FFC cable and connector like this :

In this article, we choose RT214 as an example to do the connection and integration.

 

 

Part II: Connection solutions:

RTscan provides two types of solutions:

 

 

Solution 1: UART TTL Interface

RTscan developed a multi-interface Shield, connect the shield with Arduino UNO, connect the OEM barcode scanners to our EVK board (with trigger button and beeper ), then connect them via a 6pins UART TTL cable:

 

Via this solution, we make the connection between the barcode scanner engine and Arduino much durable/ solid.


And for this solution, the RT214 scanner needs to be set to TTL-232 Communication (follow Part III/TTL-232 communication).

 

♠ OEM Scanner Modules that compliant with this solution:

RT217

 RT206 RT207 RT208 RT214 RT214B RT214C

∗please click the model number to view the full product introduction page.

 

Note: we have similar solutions for fixed mount type scanner RT830C and RT830i

UART-TTL:

12pins flat cable TTL-232:

If you prefer this type of scanner, please contact our sales team to get detailed information: sales@rtscan.net

 

 

Solution 2: Connect via USB host A

If you prefer your barcode scanner with a USB interface instead of a UART TTL cable,  then you can use this solution:  use an Arduino USB host shield.

The Arduino USB Host Shield allows you to connect a USB barcode scanner to your Arduino board, set up RTscan’s barcode scanner to HID mode, or USB CDC (Virtual Com mode).

 

Please follow Part III/USB CDC Communication/USB-HID Communication to check how to make them work together.

 

♠ Barcode Scanner Modules that compliant with this solution:

All barcode scanners have a USB interface.  All RTscan’s OEM scanner modules, fixed-mount types, and handheld types. 

 

 

Part III:

Get the OEM barcode scanner module work with the Arduino system /Arduino C++ sample code:

 

We developed sample code (only compatible with RTscan’s scanners) to work with our scanners so that you can copy our source codes and program your system very quickly and no need to write the whole code one by one; save your time and speed up your integration work!

In this article, we choose RT214 as an example to do the programming.

 

 

1. UART-TTL Communication

 

Step 1: Hardware connection

Connect RT214+EVK board to Arduino UNO as said above

 

Step 2: RT214 settings

RT214 needs to be set up with TTL-232 mode, scan the following barcode

Set to TTL-232 Mode, the default baud rate is 9600, 8-n-1

Enter setup

Set to TTL-232 mode

For more details, please refer to “RT214_User_Guide”

 

Step 3: Run the sample code

Upload the below sample code rt214_test_demo.ino to Arduino UNO.

 

 
 
/*
RT214 Test demo
by RTSCAN 20200903
*/
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX

void printHex(char *p, int len)
{
  char tmp[5];
  for (int i = 0; i < len; i++)
  {
    sprintf(tmp, "%02x ", p[i]);
    Serial.print(tmp);
  }
  Serial.println();
}

bool check_response(unsigned long timeout, String response)
{
  char c;
  String buffer;
  bool found = false;
  unsigned long t = millis();

  while (millis() - t < timeout)
  {
    if (mySerial.available() > 0)
    {
      c = mySerial.read();
      buffer += c;
      if (buffer.indexOf(response) != -1 || buffer.equals(response))
      {
        found = true;
        break;
      }
    }
  }

  while (mySerial.available() > 0)
  {
    c = mySerial.read();
    buffer += c;
  }

  Serial.println(buffer);
  printHex(buffer.c_str(), buffer.length());

  return found;
}

void send_cmd(char * p)
{
  mySerial.print(p);
  check_response(100, "\x06");
}

void trigger_stop_settings() 
{
  Serial.println("trigger_stop_settings");
  send_cmd("\x1b\x30");
}

void analog_trigger_setting() 
{
  Serial.println("analog_trigger_setting");
  send_cmd("\x1b\x31");
}

void automatic_reading_settings() 
{
  Serial.println("automatic_reading_settings");
  send_cmd("\x1b\x32");
}

void continuous_reading_settings() 
{
  Serial.println("continuous_reading_settings");
  send_cmd("\x1b\x33");
}

void query_ESN() 
{
  Serial.println("query_ESN");
  send_cmd("\x7E\x00\x00\x05\x33\x48\x30\x32\x30\xB3");
}

void setup()
{
  Serial.begin(115200);
  while (!Serial)
  {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.println("RT214 Test demo");

  mySerial.begin(9600);

  query_ESN();
  
  trigger_stop_settings();
}
...

 
 

Please contact us to get full sample codes: sales@rtscan.net

 

And the RT214 automatically detects and reads bar codes.

Output:

 

Introduction of the serial port commands protocol for RT214

The often-used serial port commands are as below (HEX):

Trigger mode：1B 31

Stop scanning：1B 30

Auto mode：1B 32

Continuous read mode：1B 33

For more details, please refer to 《RTscan Serial Programming Command Manual.PDF》

 

 

2. USB CDC Communication

In this solution, we connect the OEM barcode scanner to Arduino via USB host shield, and firstly we need to set the scanner to USB Virtual Com emulation mode, and the Arduino recognizes the scanner as a USB CDC device. Follow the steps as below:

 

Step 1: Hardware connection

Connect the RT214 scanner to the USB port of the Arduino USB host shield through a USB data cable.

 

Step 2: RT214 settings

RT214 set to USB CDC mode, scan the following Setting bar code.

Enter setup

Set to USB-CDC mode:

Recognized as a COM port device on the computer:

 

Step 3: Include the library

Arduino Library Manager

First, install Arduino IDE version 1.6.2 or newer, then simply use the Arduino Library Manager to install the library.

Please see the following page for instructions:

http://www.arduino.cc/en/Guide/Libraries#toc3

 

Manual installation

First download the library by clicking on the following link:

https://github.com/felis/USB_Host_Shield_2.0

Then uncompress the zip folder and rename the directory to “USB_Host_Shield_20”, as any special characters are not supported by the Arduino IDE.

Now open up the Arduino IDE and open “File>Preferences”. There you will see the location of your sketchbook. Open that directory and create a directory called “libraries” inside that directory. Now move the “USB_Host_Shield_20” directory to the “libraries” directory.

The final structure should look like this:

  • Arduino/
    • libraries/
      • USB_Host_Shield_20/

Now quit the Arduino IDE and reopen it.

Now you should be able to open all the examples codes by navigating to “File>Examples>USB_Host_Shield_20” and then select the example you will like to open.

For more information please visit the following sites:

http://arduino.cc/en/Guide/Libraries

https://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use.

 

Step 4: Run the sample code

Run:

acm_terminal. ino

 
#include <cdcacm.h>
#include <usbhub.h>

#include "pgmstrings.h"

// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#include <SPI.h>

class ACMAsyncOper : public CDCAsyncOper
{
public:
    uint8_t OnInit(ACM *pacm);
};

uint8_t ACMAsyncOper::OnInit(ACM *pacm)
{
    uint8_t rcode;
    // Set DTR = 1 RTS=1
    rcode = pacm->SetControlLineState(3);

    if (rcode)
    {
        ErrorMessage<uint8_t>(PSTR("SetControlLineState"), rcode);
        return rcode;
    }

    LINE_CODING	lc;
    lc.dwDTERate	= 115200;
    lc.bCharFormat	= 0;
    lc.bParityType	= 0;
    lc.bDataBits	= 8;

    rcode = pacm->SetLineCoding(&lc);

    if (rcode)
        ErrorMessage<uint8_t>(PSTR("SetLineCoding"), rcode);

    return rcode;
}

USB     Usb;
//USBHub     Hub(&Usb);
ACMAsyncOper  AsyncOper;
ACM           Acm(&Usb, &AsyncOper);

void setup()
{
  Serial.begin( 115200 );
#if !defined(__MIPSEL__)
  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
  Serial.println("Start");
  Serial.println("Please set the scanner to USB CDC mode");

  if (Usb.Init() == -1)
      Serial.println("OSCOKIRQ failed to assert");

  delay( 200 );
}
...

 



Please contact us to get full sample codes: sales@rtscan.net


 

Open the serial port for debugging:

 

Scan any barcode and it will be shown as below:

 

 

3. USB-HID Communication

In this solution, the scanner is set to USB HID KBW mode, and the Arduino recognizes the scanner as a USB keyboard simulation device.

 

Step 1: Hardware connection

Connect the RT214 scanner to the USB port of the Arduino USB host shield through a USB data cable.

 

Step 2: RT214 settings

RT214 set to USB CDC mode, scan the following Setting bar code

Enter setup:

Set to USB-HID mode:

Recognized as  on the computer:

 

Step 3: Include the library

Arduino Library Manager

First, install Arduino IDE version 1.6.2 or newer, then simply use the Arduino Library Manager to install the library.

Please see the following page for instructions:

http://www.arduino.cc/en/Guide/Libraries#toc3

 

Manual installation

First download the library by clicking on the following link:

https://github.com/felis/USB_Host_Shield_2.0

Then uncompress the zip folder and rename the directory to “USB_Host_Shield_20”, as any special characters are not supported by the Arduino IDE.

Now open up the Arduino IDE and open “File>Preferences”. There you will see the location of your sketchbook. Open that directory and create a directory called “libraries” inside that directory. Now move the “USB_Host_Shield_20” directory to the “libraries” directory.

The final structure should look like this:

  • Arduino/
    • libraries/
      • USB_Host_Shield_20/

Now quit the Arduino IDE and reopen it.

Now you should be able to open all the examples codes by navigating to “File>Examples>USB_Host_Shield_20” and then selecting the example you would like to open.

For more information please visit the following sites:

http://arduino.cc/en/Guide/Libraries

https://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use.

 

Step 4: Run the sample code

Run: Scanner_USBHIDUniversalKbd. ino

#include <hidboot.h>
#include <usbhid.h>
#include <hiduniversal.h>

#include <SPI.h>

class KbdRptParser : public KeyboardReportParser
{
  public:
    void PrintKey(uint8_t mod, uint8_t key);

    bool isScanEnd();
    void PrintScanCode();

  protected:
    void OnControlKeysChanged(uint8_t before, uint8_t after);

    void OnKeyDown  (uint8_t mod, uint8_t key);
    void OnKeyUp    (uint8_t mod, uint8_t key);
    void OnKeyPressed(uint8_t key);

    String ScanCode = "";
    uint32_t FreeTime = 0;
    bool StartScan = false;
};

void KbdRptParser::PrintKey(uint8_t m, uint8_t key)
{
  MODIFIERKEYS mod;
  *((uint8_t*)&mod) = m;
  Serial.print((mod.bmLeftCtrl   == 1) ? "C" : " ");
  Serial.print((mod.bmLeftShift  == 1) ? "S" : " ");
  Serial.print((mod.bmLeftAlt    == 1) ? "A" : " ");
  Serial.print((mod.bmLeftGUI    == 1) ? "G" : " ");

  Serial.print(" >");
  PrintHex<uint8_t>(key, 0x80);
  Serial.print("< ");

  Serial.print((mod.bmRightCtrl   == 1) ? "C" : " ");
  Serial.print((mod.bmRightShift  == 1) ? "S" : " ");
  Serial.print((mod.bmRightAlt    == 1) ? "A" : " ");
  Serial.println((mod.bmRightGUI    == 1) ? "G" : " ");
};

void KbdRptParser::OnControlKeysChanged(uint8_t before, uint8_t after) {

  MODIFIERKEYS beforeMod;
  *((uint8_t*)&beforeMod) = before;

  MODIFIERKEYS afterMod;
  *((uint8_t*)&afterMod) = after;

  if (beforeMod.bmLeftCtrl != afterMod.bmLeftCtrl) {
    Serial.println("LeftCtrl changed");
  }
  if (beforeMod.bmLeftShift != afterMod.bmLeftShift) {
    Serial.println("LeftShift changed");
  }
  if (beforeMod.bmLeftAlt != afterMod.bmLeftAlt) {
    Serial.println("LeftAlt changed");
  }
  if (beforeMod.bmLeftGUI != afterMod.bmLeftGUI) {
    Serial.println("LeftGUI changed");
  }

  if (beforeMod.bmRightCtrl != afterMod.bmRightCtrl) {
    Serial.println("RightCtrl changed");
  }
  if (beforeMod.bmRightShift != afterMod.bmRightShift) {
    Serial.println("RightShift changed");
  }
  if (beforeMod.bmRightAlt != afterMod.bmRightAlt) {
    Serial.println("RightAlt changed");
  }
  if (beforeMod.bmRightGUI != afterMod.bmRightGUI) {
    Serial.println("RightGUI changed");
  }

}

void KbdRptParser::OnKeyDown(uint8_t mod, uint8_t key)
{
  // Serial.print("DN ");
  // PrintKey(mod, key);
  uint8_t c = OemToAscii(mod, key);

  if (c)
    OnKeyPressed(c);
}

void KbdRptParser::OnKeyUp(uint8_t mod, uint8_t key)
{
  // Serial.print("UP ");
  // PrintKey(mod, key);
  
  FreeTime = millis();
  StartScan = true;
}

void KbdRptParser::OnKeyPressed(uint8_t key)
{
  // Serial.print("ASCII: ");
  // Serial.println((char)key);
  ScanCode = ScanCode + String((char)key);
};

bool KbdRptParser::isScanEnd()
{
  if(millis() - FreeTime > 200 && StartScan){
      StartScan = false;
      return true;
  }

  return false;
};

void KbdRptParser::PrintScanCode()
{
  Serial.print("ScanCode: ");
  Serial.println(ScanCode);
  ScanCode = "";
};

USB          Usb;
HIDUniversal Hid(&Usb);
KbdRptParser Prs;

void setup()
{
  Serial.begin( 115200 );
#if !defined(__MIPSEL__)
  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
  Serial.println("Start");
  Serial.println("Please set the scanner to USB HID mode");

  if (Usb.Init() == -1)
    Serial.println("OSC did not start.");

  delay( 200 );

  Hid.SetReportParser(0, &Prs);
}
 ...



Please contact us to get full sample codes: sales@rtscan.net

 

 

Open the serial port for debugging：

Scan any barcode and it will be shown as below:

 

This article is a solution introduction for Arduino barcode scanners, if you are using Raspberry Pi and need an OEM barcode scanner, please read: Raspberry Pi barcode scanner

If you need an embedded type 2d and QR barcode scanner for Arduino, please read:

Embedded QR Code scanner for Arduino

If you need an Embedded barcode scanner for Raspberry Pi, please read:

Embedded barcode scanner for Raspberry Pi

We developed an Arduino solution for most of our OEM barcode scanners, includes RT203 RT206 RT207 RT208 RT209 RT211 RT830B, if you want to learn more about them, please view below: https://www.rtscan.net/barcode-readers/oem-barcode-scanners/

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