Design with GM803 1D/2D Barcode Reader Module CMOS Scanner TTL/USB in Cirkit DesignerThe GM803 is a versatile barcode scanner module designed to read both 1D and 2D barcodes with high efficiency. Utilizing advanced CMOS imaging technology, it ensures accurate and fast barcode decoding. The module supports both TTL and USB interfaces, making it easy to integrate into a wide range of electronic systems, including embedded devices, kiosks, and point-of-sale (POS) systems.
This circuit features an ESP32 microcontroller interfaced with a thermal printer and a GM67 barcode reader module. The ESP32 handles communication with the printer and barcode reader via its GPIO pins, enabling barcode data to be read and printed. Power is supplied to all components through the ESP32's Vin and GND pins.
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 Designer
This circuit features a microcontroller (STM32F103C8T6) interfaced with a SIM900A GSM module, an HC-SR04 ultrasonic sensor, a water level sensor, and a LoRa Ra-02 SX1278 module for long-range communication. The STM32F103C8T6 is configured to communicate with the GSM module and LoRa module via serial connections, and it reads data from the ultrasonic and water level sensors. An FTDI Programmer is connected for programming and serial communication with the microcontroller.
Open Project in Cirkit Designer
This is a sensor-based data acquisition system with GSM communication capability. It uses an ESP8266 NodeMCU to collect environmental data from a DHT22 sensor and light levels from an LDR, as well as distance measurements from an HC-SR04 ultrasonic sensor. The SIM900A GSM module enables the system to transmit the collected data over a cellular network.
Open Project in Cirkit Designer| Parameter | Specification |
|---|---|
| Barcode Types Supported | 1D (e.g., Code 128, EAN-13) and 2D (e.g., QR Code, Data Matrix) |
| Sensor Type | CMOS |
| Interface Options | TTL, USB |
| Operating Voltage | 3.3V to 5V |
| Current Consumption | < 120mA |
| Scanning Speed | Up to 300 scans per second |
| Resolution | 640 x 480 pixels |
| Operating Temperature | -20°C to 60°C |
| Dimensions | 21mm x 15mm x 10mm |
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VCC | Power supply input (3.3V to 5V) |
| 2 | GND | Ground |
| 3 | TXD | Transmit data (TTL level) |
| 4 | RXD | Receive data (TTL level) |
| 5 | Trigger | External trigger input (active low) |
| 6 | Beeper | Beeper control output |
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VBUS | USB power supply (5V) |
| 2 | D- | USB data negative |
| 3 | D+ | USB data positive |
| 4 | GND | Ground |
Below is an example of how to connect and use the GM803 with an Arduino UNO via the TTL interface.
| GM803 Pin | Arduino UNO Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TXD | RX (Pin 0) |
| RXD | TX (Pin 1) |
| Trigger | Digital Pin 2 |
#include <SoftwareSerial.h>
// Define RX and TX pins for the GM803 module
SoftwareSerial barcodeScanner(10, 11); // RX = Pin 10, TX = Pin 11
// Define the trigger pin
const int triggerPin = 2;
void setup() {
// Initialize serial communication
Serial.begin(9600); // For debugging
barcodeScanner.begin(9600); // For GM803 communication
// Configure the trigger pin
pinMode(triggerPin, OUTPUT);
digitalWrite(triggerPin, HIGH); // Set trigger pin to inactive state
Serial.println("GM803 Barcode Scanner Initialized");
}
void loop() {
// Trigger a scan
digitalWrite(triggerPin, LOW); // Activate the scanner
delay(100); // Wait for the scan to complete
digitalWrite(triggerPin, HIGH); // Deactivate the scanner
// Check if data is available from the scanner
if (barcodeScanner.available()) {
String barcodeData = "";
while (barcodeScanner.available()) {
char c = barcodeScanner.read();
barcodeData += c;
}
Serial.println("Scanned Barcode: " + barcodeData);
}
delay(1000); // Wait before the next scan
}
No Data Output from the Scanner
Scanner Does Not Trigger
Unreadable or Inaccurate Scans
Module Overheating
Can the GM803 read barcodes on screens?
What is the maximum scanning distance?
Is the GM803 compatible with Raspberry Pi?
Does the module require additional drivers for USB communication?