Design with SparkFun 2D Barcode Scanner Breakout - DE2120 in Cirkit DesignerThe SparkFun 2D Barcode Scanner Breakout - DE2120 is a compact and versatile module designed to interface with 2D barcode scanners. It enables seamless integration into projects requiring the scanning of QR codes, Data Matrix codes, and other 1D/2D barcodes. This breakout board is ideal for applications in retail, inventory management, access control, and embedded systems where barcode scanning is essential.
With its small form factor and straightforward connectivity options, the DE2120 breakout board simplifies the process of adding barcode scanning functionality to your projects. It supports both UART and USB communication, making it compatible with a wide range of microcontrollers and systems.
This circuit features an Arduino UNO microcontroller interfaced with an LCD display, a barcode scanner, and an SD card module. The Arduino is powered by a 12V battery and controls the display and data logging functionalities, while the barcode scanner provides input data.
Open Project in Cirkit Designer
This circuit is designed to detect color changes in a solution using a spectral sensor, time the change, provide a sound cue via a piezo buzzer, and send the timing data to a computer via a Bluetooth module. The Arduino UNO microcontroller coordinates the sensor readings, timing, and communication, while an OLED display and NeoPixel ring provide visual feedback.
Open Project in Cirkit Designer
This is a multi-functional sensor system controlled by an Arduino Mega 2560, designed to read biometric data from a pulse oximeter and an infrared thermometer, authenticate using a fingerprint scanner, display information on an OLED screen, and transmit data wirelessly via an ESP8266 module. User inputs can be received through two pushbuttons, and the system's power distribution is managed through common ground and voltage supply nets.
Open Project in Cirkit Designer
This circuit features an Arduino Mega 2560 microcontroller interfaced with a SIM800L GSM module, two fingerprint scanners, an I2C LCD display, an IR sensor, and a piezo buzzer. Power management is handled by a PowerBoost 1000 Basic Pad USB, a TP4056 charging module, and a Li-ion 18650 battery, with an option to use a Mini AC-DC 110V-230V to 5V 700mA module for direct power supply. The primary functionality appears to be a security system with GSM communication capabilities, biometric access control, and visual/audible feedback.
Open Project in Cirkit DesignerThe DE2120 breakout board features a 6-pin header for UART communication and a micro-USB connector for USB communication. Below is the pinout for the 6-pin header:
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Power input (3.3V to 6V DC) |
| 2 | GND | Ground |
| 3 | TXD | UART Transmit (3.3V logic) |
| 4 | RXD | UART Receive (3.3V logic) |
| 5 | CTS | Clear to Send (optional, for UART flow control) |
| 6 | RTS | Request to Send (optional, for UART flow control) |
Powering the Module:
Communication Setup:
Barcode Scanning:
Below is an example of how to connect the DE2120 to an Arduino UNO using UART communication:
| DE2120 Pin | Arduino UNO Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TXD | Pin 10 (RX) |
| RXD | Pin 11 (TX) |
#include <SoftwareSerial.h>
// Define RX and TX pins for SoftwareSerial
SoftwareSerial barcodeScanner(10, 11); // RX = Pin 10, TX = Pin 11
void setup() {
Serial.begin(9600); // Initialize Serial Monitor
barcodeScanner.begin(9600); // Initialize barcode scanner communication
Serial.println("SparkFun DE2120 Barcode Scanner Example");
Serial.println("Present a barcode to the scanner...");
}
void loop() {
// Check if data is available from the barcode scanner
if (barcodeScanner.available()) {
String barcodeData = "";
// Read all available data from the scanner
while (barcodeScanner.available()) {
char c = barcodeScanner.read();
barcodeData += c;
}
// Print the scanned barcode data to the Serial Monitor
Serial.println("Scanned Data: " + barcodeData);
}
}
No Data Received from the Scanner:
Scanner Fails to Detect Barcodes:
Communication Issues with Arduino:
Can the DE2120 scan barcodes on a screen?
Yes, the DE2120 can scan barcodes displayed on screens, such as smartphones or tablets.
What is the maximum scanning distance?
The effective scanning distance depends on the barcode size and type but typically ranges from 5cm to 30cm.
Can I change the default UART baud rate?
Yes, the baud rate can be configured using specific commands sent to the module. Refer to the manufacturer's datasheet for details.
Is the DE2120 compatible with Raspberry Pi?
Yes, the DE2120 can be connected to a Raspberry Pi via UART or USB.
This concludes the documentation for the SparkFun 2D Barcode Scanner Breakout - DE2120. For additional support, refer to the official SparkFun resources or community forums.