QR204 58mm Embedded Thermal Receipt Printer Mini TTL USB Panel Mount Black

Specifications:

• Product: Thermal Printer
• Model: QR204
• Voltage: 5V - 9V DC
• Working current: 2A
• Standby current: 0.02A
• Communication interface: TTL and USB
• Printing method: Line thermal printing
• Printing mode: Receipt printing/label printing
• Printing colour: Black and white output
• Resolution: 203DPI (8 dots/mm, 0.125mm/dot, 384 dots per line)
• Consumables: Thermal receipt paper roll, thermal label paper roll
• Paper roll specifications: Paper roll width (58mm±0.5mm), paper roll diameter (30mm)
• Printing content: Support text, graphics, one-dimensional barcode, two-dimensional code, curve, etc.
• Printing width: 48mm (effective printing width)
• Printing life: 50 kilometres
• Printing speed: 70mm/s
• Housing Colour: Black
• Working temperature: -5℃~50℃
• Working humidity: 25%-50% RH
• Appearance size: 82*58*44 mm
• Installation size: 77*53*42 mm

Downloads:

• QR204 -Thermal printer _Datasheet & User manual

Applications: 

• Ideal for printing receipts and invoices in retail stores, restaurants, and supermarkets.
• Suitable for issuing tickets in transportation systems, such as buses, trains, and taxis.
• It can be used in hospitals and clinics for printing patient receipts and medical reports.
• Useful for printing shipping labels and delivery receipts in logistics and courier services.

Package Includes: 

• 1 x QR204 Embedded thermal printer 
• 1 x 2PIN power cable
• 1 x 4PIN communication cable
• 1 x USB data cable

Frequently Asked Questions(FAQs)

• Is the QR204 thermal printer compatible with Arduino and Raspberry Pi?
  Yes, it easily interfaces with both Arduino and Raspberry Pi using its TTL serial connection.
• Does the QR204 work with 3.3V microcontrollers like ESP32 or STM32?
  While the communication lines can often accept 3.3V logic, the module strictly requires a separate 5V power supply for the heating element.
• Can I connect this printer directly to my PC?
  Yes, it includes a USB interface that allows you to connect and print directly from a computer using standard ESC/POS drivers.
• Are standard 58mm thermal paper rolls compatible with this module?
  Yes, it uses standard 58mm wide thermal receipt paper with a maximum roll diameter of 30mm.
• What voltage does the QR204 printer require?
  The printer requires a stable 5V DC power supply to operate correctly.
• How much current does the QR204 draw during printing?
  It draws up to 2A of current while printing, so a dedicated high-current power adapter is strictly required.
• Can I power the QR204 from the 5V pin on my Arduino?
  No, the Arduino's onboard voltage regulator cannot supply 2A, which will immediately cause your board to brownout or reset.
• How do I connect the QR204 to an Arduino Uno?
  Connect the printer's RX to an Arduino TX pin, TX to an Arduino RX pin, and ensure both boards share a common ground.
• Do I need a separate power cable for the printer?
  Yes, the module features a dedicated 2-pin connector for the 5V 2A supply, which is separate from the 4-pin TTL communication cable.
• Is a voltage divider required for the TX/RX pins when using an ESP32?
  The printer's RX pin will safely accept a 3.3V signal from your ESP32, but a voltage divider on the printer's TX line is recommended to protect your 3.3V board.
• Which Arduino library should I use for the QR204?
  The Adafruit Thermal Printer library is highly recommended as it perfectly handles the ESC/POS commands required for this module.
• Can I print barcodes and QR codes with this printer? Yes, the module natively supports printing text, graphics, one-dimensional barcodes, and two-dimensional QR codes via standard serial commands.
• Where can I find example code for the QR204 with Arduino?
  ???? Search "Adafruit Thermal Printer Library GitHub" to find comprehensive example sketches and bitmap printing tools.
• What interfaces does this printer support?
  This version supports USB and TTL interfaces, allowing it to connect with
  computers, microcontrollers, and embedded systems.