Arduino Thermal printer

Control a thermal printer with Arduino

26-06-21 5990

Purpose of this tutorial:

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
QR701 thermal printer 5V-2A charger
Test plate
Connecting wires

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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