Arduino Thermal printer

Control a thermal printer with Arduino

26-06-21 7622

A thermal printer is a type of printer that uses heat to transfer ink or toner onto paper. Instead of using ink cartridges or toner cartridges, thermal printers use special thermal paper that has a coating of heat-sensitive material on one side. When the paper is passed through the printer, heat is applied to the coating, which causes the material to darken and create an image or text.

Thermal printers are widely used in many different applications, such as point-of-sale (POS) systems, label printing, and barcode printing. They are known for their speed, durability, and low cost of operation, as they do not require ink or toner. However, thermal paper is costlier than regular paper and the printout is not long-lasting as it fades with time.

There are two types of thermal printers: direct thermal and thermal transfer. Direct thermal printers use heat to activate the ink on the special thermal paper directly, while thermal transfer printers use a ribbon that is heated and pressed against the paper to transfer ink.

An Arduino is a microcontroller board that can be programmed to control various devices, including a thermal printer. To use a thermal printer with an Arduino, you will need to connect the printer to the Arduino using a serial or parallel connection, and then use the Arduino programming language to send commands to the printer to print text or graphics. You may also need to install a library or set of libraries to interface with the thermal printer.

Purpose of this tutorial:

The QR701 thermal printer is a type of thermal printer that can be controlled by an Arduino. To use the QR701 thermal printer with an Arduino, you will need to connect the printer to the Arduino using a serial connection, and then use the Arduino programming language to send commands to the printer to print text or graphics. You may also need to install a library or set of libraries to interface with the QR701 thermal printer. The QR701 thermal printer is a printer that is commonly used in POS systems and can be found in many retail locations.

It is important to note that the QR701 thermal printer uses ESC/POS commands to control the printer, it’s a common command set used by most thermal printers. This means that you need to make sure that you are using the right library or set of libraries that support the ESC/POS commands.

You can find sample codes, tutorials and libraries online to help you get started with connecting and controlling the QR701 thermal printer with your Arduino.

In this tutorial we will see how to send data from Arduino card to a thermal printer: If you press the push button , the printer prints the word ‘Arduino’.

Components required

Arduino UNO

The Arduino UNO is a microcontroller board based on the ATmega328P microcontroller. It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. The board is equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards and other circuits. The board can be programmed with the Arduino software (IDE), which is available for free on the Arduino website.

The Arduino UNO is a popular choice for beginners and hobbyists as it is easy to use, has a large community and a wide range of libraries available, allowing for easy integration of sensors, actuators, and other devices.

The Arduino UNO can be connected to a computer via a USB cable, and the Arduino IDE can be used to upload the code onto the board. Once the code is uploaded, the board can function independently, even without the computer being connected.

QR701 thermal printer

The QR701 thermal printer is a compact and portable thermal printer that is typically used for point-of-sale (POS) systems, label printing, and barcode printing. It uses thermal printing technology, which means that it uses heat to transfer ink or toner onto paper.

Some of the features of the QR701 thermal printer include:

High print speed: It can print up to 90mm/s, which is quite fast
High resolution: It has a printing resolution of 8 dots/mm (203 dpi)
Support for various paper widths: Can print on paper widths from 40mm to 82.5mm
Support for various paper types: It supports paper types such as thermal paper, thermal label paper, and thermal tag paper
Support for various languages: It supports various languages such as Chinese, English, Japanese, and French
Small and lightweight: It is small and lightweight, making it easy to transport and use in various settings.

The QR701 thermal printer can be connected to a variety of devices such as computers, POS terminals, and microcontrollers, using various interfaces such as USB, serial, and Ethernet.

This printer is widely used in retail, warehouse, logistics and other industries. It can be used to print receipts, labels, and tickets, among other things.

5V-2A charger

A 5V-2A charger is a type of power supply that can be used to provide power to the QR701 thermal printer. The charger is typically a small, compact device that can be plugged into an electrical outlet to provide power to the printer.

The 5V-2A charger is necessary to provide a stable power supply to the thermal printer. The thermal printer requires a stable power supply to function properly and to avoid any damage to the internal components. The 2A part of the charger specification indicates that the charger can provide up to 2 amperes of current, which is sufficient to power the printer and keep its battery charged, if the printer has one.

Connecting wires

Connecting wires are used to connect electronic components in a circuit. They are typically made of copper and are coated with insulating material to prevent electrical contact between the wires themselves or between the wires and other conductive materials.

Mounting

To perform the assembly, we connect:

the VH pin of the printer to the (+) terminal of the charger
the first GND pin of the printer to the GND pin of the Arduino board
the second GND pin of the printer to the GND pin of the Arduino card
the TR pin of the printer to pin 6 of the Arduino card

Program

This is the program that prints data sent from the Arduino card to the printer.

/*------------------------------------------------------------------------
Example sketch for Adafruit Thermal Printer library for Arduino.
Demonstrates a few text styles & layouts, bitmap printing, etc.

IMPORTANT: DECLARATIONS DIFFER FROM PRIOR VERSIONS OF THIS LIBRARY.
This is to support newer & more board types, especially ones that don't
support SoftwareSerial (e.g. Arduino Due). You can pass any Stream
(e.g. Serial1) to the printer constructor. See notes below.
------------------------------------------------------------------------*/

#include "Adafruit_Thermal.h"
#include "adalogo.h"
#include "adaqrcode.h"

// Here's the new syntax when using SoftwareSerial (e.g. Arduino Uno) ----
// If using hardware serial instead, comment out or remove these lines:

#include "SoftwareSerial.h"
#define TX_PIN 6 // Arduino transmit YELLOW WIRE labeled RX on printer
#define RX_PIN 5 // Arduino receive GREEN WIRE labeled TX on printer

SoftwareSerial mySerial(RX_PIN, TX_PIN); // Declare SoftwareSerial obj first
Adafruit_Thermal printer(&mySerial); // Pass addr to printer constructor
// Then see setup() function regarding serial & printer begin() calls.

// Here's the syntax for hardware serial (e.g. Arduino Due) --------------
// Un-comment the following line if using hardware serial:

//Adafruit_Thermal printer(&Serial1); // Or Serial2, Serial3, etc.

// -----------------------------------------------------------------------
const int btnPin = A0; // le bouton est connecté à la broche A0 de la carte Adruino
int btnVal = 0;
void setup() {
pinMode(btnPin,INPUT_PULLUP);

// This line is for compatibility with the Adafruit IotP project pack,
// which uses pin 7 as a spare grounding point. You only need this if
// wired up the same way (w/3-pin header into pins 5/6/7):
pinMode(7, OUTPUT); digitalWrite(7, LOW);

// NOTE: SOME PRINTERS NEED 9600 BAUD instead of 19200, check test page.
mySerial.begin(9600); // Initialize SoftwareSerial
//Serial1.begin(19200); // Use this instead if using hardware serial
printer.begin(); // Init printer (same regardless of serial type)

// The following calls are in setup(), but don't *need* to be. Use them
// anywhere! They're just here so they run one time and are not printed
// over and over (which would happen if they were in loop() instead).
// Some functions will feed a line when called, this is normal.
}

void loop() {
btnVal=analogRead(btnPin);
if(btnVal<200){ // We press the push button
 printer.println(F("Arduino"));
}
}

/*------------------------------------------------------------------------

Example sketch for Adafruit Thermal Printer library for Arduino.

Demonstrates a few text styles & layouts, bitmap printing, etc.

IMPORTANT: DECLARATIONS DIFFER FROM PRIOR VERSIONS OF THIS LIBRARY.

This is to support newer & more board types, especially ones that don't

support SoftwareSerial (e.g. Arduino Due). You can pass any Stream

(e.g. Serial1) to the printer constructor. See notes below.

------------------------------------------------------------------------*/

#include "Adafruit_Thermal.h"

#include "adalogo.h"

#include "adaqrcode.h"

// Here's the new syntax when using SoftwareSerial (e.g. Arduino Uno) ----

// If using hardware serial instead, comment out or remove these lines:

#include "SoftwareSerial.h"

#define TX_PIN 6 // Arduino transmit YELLOW WIRE labeled RX on printer

#define RX_PIN 5 // Arduino receive GREEN WIRE labeled TX on printer

SoftwareSerial mySerial(RX_PIN, TX_PIN); // Declare SoftwareSerial obj first

Adafruit_Thermal printer(&mySerial); // Pass addr to printer constructor

// Then see setup() function regarding serial & printer begin() calls.

// Here's the syntax for hardware serial (e.g. Arduino Due) --------------

// Un-comment the following line if using hardware serial:

//Adafruit_Thermal printer(&Serial1); // Or Serial2, Serial3, etc.

// -----------------------------------------------------------------------

const int btnPin = A0; // le bouton est connecté à la broche A0 de la carte Adruino

int btnVal = 0;

void setup() {

pinMode(btnPin,INPUT_PULLUP);

// This line is for compatibility with the Adafruit IotP project pack,

// which uses pin 7 as a spare grounding point. You only need this if

// wired up the same way (w/3-pin header into pins 5/6/7):

pinMode(7, OUTPUT); digitalWrite(7, LOW);

// NOTE: SOME PRINTERS NEED 9600 BAUD instead of 19200, check test page.

mySerial.begin(9600); // Initialize SoftwareSerial

//Serial1.begin(19200); // Use this instead if using hardware serial

printer.begin(); // Init printer (same regardless of serial type)

// The following calls are in setup(), but don't *need* to be. Use them

// anywhere! They're just here so they run one time and are not printed

// over and over (which would happen if they were in loop() instead).

// Some functions will feed a line when called, this is normal.

}

void loop() {

btnVal=analogRead(btnPin);

if(btnVal<200){ // We press the push button

printer.println(F("Arduino"));

}

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