Arduino hardware serial example

Arduino hardware serial example. We can use serial communication to debug the code and track errors to interface those devices. Just saw "Every". . Its works realy fine 🙂 if i put the data via Keyboard-Simulator (Keyboard. First of all, let me tell you where you can find Examples of Software Serial. Codespaces. In this example project, we’ll establish serial communication between Arduino & PC using the UART serial port. In case of ESP32, there are multiple hardware UARTs available for serial communication. This example demonstrates how to virtually connect together Serial and Serial1. For more circuit examples, see the Fritzing Jun 27, 2013 · Hi, Does anyone know how to use the TinyGPS library (version 12 currently) with hardware serial, instead of software serial? This is the example sketch: #include <SoftwareSerial. We’ll get an overview of the serial communication ports (protocols) available in By utilizing serial communication, Arduino can send and receive data in real-time, making it ideal for various projects that require interaction with sensors, displays, or other hardware components. Required for Leonardo/Micro native USB port only while (! The Arduino Uno R3 has a single hardware serial port (UART) that can be used for serial communication. In this tutorial, we’ll discuss the Arduino Serial Communication Ports (Protocols) that we can use for communicating with other sensors, modules, and microcontrollers. Jan 23, 2017 · Arduino Code. I found the solution after reading Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) · Issue #210 · arduino/ArduinoCore-mbed · GitHub. We’ll get an overview of the serial communication ports (protocols) available in the Arduino, their IO pins, specifications, differences, use cases, and applications. Feb 6, 2023 · Home / Programming / Built-in Examples / Switch (case) Statement, used with serial input Switch (case) Statement, used with serial input. The ESP32 is a series of low-cost, low-power system-on-chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. Print String And Variable Arduino. Dec 8, 2023 · To interface an Arduino with a Modbus RTU (RS485) sensor, we will use an RS485 to TTL module (MAX485) to convert the RS485 signal to TTL signal that can be understood by the Arduino. The Arduino Uno can send data (such as a text message) to a PC or computer over a USB cable. Thus, if you use these functions, you cannot also use pins 0 and 1 for Jul 6, 2019 · There is only ONE hardware serial pair on a Nano, and that is being used by the USB<>Serial chip. Not the best choice but useful is this scenario. The Serial 1 baud rate parameter is set to 9600. You can have a look at an example of using Multiple Hardware Serials by going to File → Examples → Communication → MultiSerial. One of the key reasons to use serial communication in Arduino is its versatility. 21 hours ago · Description. Arduino RS485. Est. Introduction. May 3, 2019 · This is my first attempt at using UART for serial transmission other than standard Serial operations. Also dont see any examples on how to use USBHid in a generic way - only see mouse, keyboard Any ideas or examples floating around. Jan 25, 2022 · This example demonstrates use of the serialEvent() function. Since we are using a RedBoard here, this example uses pin 2 to monitor for interrupts. Aug 2, 2012 · Created on: 2 August 2012. Although the proposed code did not compile as it was shown there. That is true for the Nano Classic and many other Arduinos based on the 328 chip but not for the ESP32 based board. Board 2 will then receive both messages and write them down in the serial monitor. Here is the sketch: // Simple test for receiving data from Serial // like BU-353S4 // // This example is May 13, 2024 · You can use the Arduino environment’s built-in serial monitor to communicate with an Arduino board. myPrint("arduino");", which will be transmitted via the 'tx' pin 3(which is set as my software 'tx' pin; pin 2 is the software 'rx') and collect the same into a variable, via the 'rx' pin of arduino. Arduino also has more details on a handful of boards on their attachInterrupt() page. This is a handy command if you do not always have the same length data. cpp:61:74: error: expected primary-expression before ')' token The Arduino’s microcontroller supports 3 serial communication ports ( UART, SPI, and I2C ). This is typically used for debugging and monitoring. HardwareSerial_RS485. 0 License. PC → Arduino: Sends data (command) from PC to Arduino. : Arduino UNO). Feb 10, 2022 · HardwareSerialは、Arduinoの標準ライブラリSerialとして追加されており、PD0(RXD)とPD1(TXD)でUSB接続を行い、PCとシリアル通信をすることができる。サンプルとして、PCから入力された文字をオウム返しで返すプログラムを紹介する。 Sep 28, 2022 · Arduino IDE 2. Usage. If you are using any other serial port pins for communication Aug 8, 2021 · ESP32 Hello World - Serial Print For Debugging - Arduino – DeepBlue. g. Because I thought I understood how Serial was working, I thought it would be easy to jump onto another UART and get everything going. This library is bundled with every Arduino platform (avr, megaavr, mbed, samd, sam, arc32), so you do not need to install the library separately. In this example I change the example 3 from hardware serial to software serial using the software serial library that comes with the Arduino IDE. Arduino sends data to your computer over Serial port 0 (USB port). readBytesUntil(termChar,buffer, length) // if numberOfBytes >0 we have data. 3) How t Copy Command. So it can use hardware for the serial communication with the PC (e. If you are using any other serial port pins for communication Use write in a MATLAB ® Function block with the Simulink ® Support Package for Arduino ® Hardware to generate code that can be deployed on Arduino Hardware. The Arduino’s microcontroller supports 3 serial communication ports ( UART, SPI, and I2C ). This sketch sends an ASCII A (byte of value 65) on startup and repeats that until it gets a serial response from the computer. , D7), one for TX (e. Hardware Required. */. It requires the use of SoftwareSerial, and assumes that you have a 4800-baud serial GPS device hooked up on pins 3(rx) and 4 May 13, 2024 · You can use the Arduino environment’s built-in serial monitor to communicate with an Arduino board. A momentary switch, button, or toggle switch. If in case the message is jumbled up: a. Serial. Once board 1 is powered up, it will run the write commands to both serial and my serial. Dec 3, 2013 · You signed in with another tab or window. Using this function will set the remaining UART parameters to default values ( Data length =8, Parity bit =1, Number of Stop Bits=None ). Used for communication between the Arduino board and a computer or other devices. May 12, 2020 · The easiest way to configure the Arduino’s UART is by using the function Serial. * There are three serial ports on the ESP known as U0UXD, U1UXD and U2UXD. Arduino Mega Hardware UART to Arduino Leonardo Software Serial The Arduino Uno R3 has a single hardware serial port (UART) that can be used for serial communication. Find anything that can be improved? Suggest corrections and new documentation via GitHub. #include <SoftwareSerial. Examples in this page demonstrates how to read serial data only when it is available, similarly to how Jan 27, 2014 · Receives from the main serial port, sends to the others. The library is backward compatible, so it’s possible to compile old projects without any changes. h, I have enabled the Hardware Serial with this: #ifdef Serial1 // this makes it not complain on compilation if there's no Serial1 #define BLUEFRUIT_HWSERIAL_NAME Serial1 #endif This Dec 8, 2022 · This example shows you how to monitor the state of a switch by establishing serial communication between your Arduino and your computer over USB. Jun 27, 2013 · Hi, Does anyone know how to use the TinyGPS library (version 12 currently) with hardware serial, instead of software serial? This is the example sketch: #include <SoftwareSerial. All Arduino boards have at least one serial port (also known as a UART or USART): Serial. This chapter explains how to send and receive information using this capability. Change the code in Board 1: Insert delay(1000) between serial and myserial write commands. Dec 13, 2023 · Serial ports enable communication between hardware devices. The only recognized boards to have support as of 2023/12/06 are the UNO R3, Nano, Mega 2560 R3 and Due. Read the documentation. The ESP32 series employs a Tensilica Xtensa LX6 microprocessor in Feb 23, 2022 · This example makes use of one of Arduino Mega's 3 auxiliary serial ports, routing any incoming data read on that connection straight to the main TX line, and, in turn, to the main serial window for you to view. Serial communications provide an easy and flexible way for your Arduino board to interact with your computer and other devices. This library implements the Modbus protocol over two different types of transport: serial communication over RS485 with RTU (Remote Terminal Unit) or Ethernet and WiFi communication with TCP protocol. May 13, 2024 · If there is enough empty space in the transmit buffer, Serial. * U1UXD is unused and can be used for your projects. Updated on: 16 January 2023. Feb 27, 2022 · I am trying to read serial data from a sensor PMS5003, which is used for environmental particulate matter parameters measurement; and a Neo-6M GPS module for GPS location data using two hardware serial ports of Arduino Mega micro-controller Board. Arduino Board; Circuit May 5, 2021 · Serial exchange between ESP8266 D1 Mini and Arduino Pro Micro. begin) on my Computer. Oct 1, 2022 · On Mega, there are several UARTs. I am using the ESP32 pico kit v4 so I have three UART pin sets. How to use the Arduino Uno USB/serial port for beginners in electronics. When you need multiple serial devices to be connected, it is possible to create multiple software serial ports. The circuit: Any serial device attached to Serial port 1; Serial monitor open on Serial port 0: created 30 Dec. There are some tutorials on here too. The different elements are highlighted, compatible libraries and boards are shown together with example code. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. May 13, 2024 · The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. Creates the serial interface via software using pins 2 (RX) and 3 (TX). If you can't find its library then you should download the Software Serial Library. Arduino Hardware Serial Terminal Arduino Hardware Serial Terminal (low level), sending complete sequence to function for processing it (mainly for user input) Author: SMFSW. , 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Modified 28 September 2010 by Mark Sproul Modified 14 August 2012 by Alarus Modified 3 December 2013 by Matthijs Kooijman */ #ifndef Description. When comes to interfacing more complicated devices such as LCD, RTC, EEPROM etc. Packages. Maintainer: SMFSW. Hardware serial (as opened with Serial. ESP32 Serial Port Print For Debugging Serial Monitor - Serial Plotter. You switched accounts on another tab or window. Apr 25, 2016 · Note that the 64 byte size of the Arduino serial input buffer does not limit the number of characters that you can receive because the code in the examples can empty the buffer faster than new data arrives. . 4. 3v Nov 7, 2023 · Arduino Serial Example #1 Remote Control Blink: Master. Now copy and paste the below code in your Arduino software: #include <SoftwareSerial. Here we use software serial instead of the hardware serial; pin8 is RX, pin9 is TX, and the same thing happens as the other example; if the letter a is received the LED on the Leonardo is turned ON if the letter x is received the LED is turned OFF. But the problem is arising when I am trying to read Jan 16, 2013 · Hi everyone, I've started work with Arduino Leonardo last week. When the Arduino hardware receives data, it transmits back the same data to the host. Serial Communications. PC to Arduino: Sending commands from the PC to the ESP8266. These two devices can be allocated to any available GPIO ports you want. Example Program 1: In this example, we will send a string from Sep 18, 2015 · I dont know how to handle serial interrupt in arduino. It provides message addressing and filtering as well as collision detection From the Groups list under Target hardware resources, select Serial port properties. begin(115200)) uses UART1 which is a transmit-only UART. To avoid this problem of frequent disconnection during uploading the code, I want to use LIDAR on Software Serial port (9,10) using 5v-3. We also need to write an Arduino code using the Modbus master library to communicate with the Modbus RTU (RS485) sensor. USB and Serial1 (pins 0 & 1) are not shared on Teensy. com/vitormhenrique/xbox_chatpad_library/blob/master/examples/Example_1/Example_1. UART0 connects to the RX0 & TX0 pins and to the USB-serial chip, but there is also UART1 (RX1, TX1), UART2 and so on. You signed out in another tab or window. breadboard. To avoid blocking calls to Serial. Compatibility. Software serial is a library that replicates the hardware serial Jan 16, 2023 · Using Multiple Software Serial. It’s based on the original HardwareSerial files modified to implement the flow control. Host and manage packages. Receives from serial port 1, sends to the main serial (Serial 0). , D6) Connect the Arduino pin (selected as RX) to the TX of the serial sensors/devices. The first button will serve as the “previous” button that will enable us to play the previous song. In this example, the baud rate of Serial 1 baud rate is set because the TX1 and RX1 pins correspond to the Serial port 1 of the Arduino hardware. You will notice that the examples here do not use any of these Arduino functions Serial. Values of dataIn is not validated against the precision. serialEvent() provides a sort of pseudo-interrupt, but only if loop() runs fairly quickly. Automate any workflow. //serial receive buffer--> "314". Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin(). The dataIn values will be saturated when it goes beyond the range of the specified precision. I realy happy with getting fast results form the Board with out knowing anything about Microcontrollers before. begin(9600); Jul 21, 2022 · Make sure that your Arduino board is attached to your computer via USB to enable serial communication through the serial monitor window of the Arduino Software (IDE). But, if you've done any Arduino development before, those may not be all that Serial Monitor is a tool found in the Arduino IDE. Not sure why the Arduino developers choose the same name for two totally different boards. For hardware serial ports, Serial1 , Serial2 , Serial3 , Serial4 , Serial5 , Serial6 , Serial7 or Serial8 must be used. This article contains information about the Modbus serial communication protocol and how it can be used with Arduino hardware. ESP32 Hello World Example Arduino. For software serial the examples will show you how the Tx/Rx pins are defined . It is used for two purposes: Arduino → PC: Receives data from Arduino and display data on screen. edster99 October 1, 2022, 12:12pm 5. In this tutorial, we'll explore the implementation of RS485 communication with Arduino. Some boards have more (like the Arduino Mega 2560) - refer to the user manual or datasheet for more information on what your specific board supports. Arduino and ESP32 support software-based serial communication using SoftwareSerial libary (for Arduino) and HardwareSerial library (for ESP32). image developed using Fritzing. begin(9600); // wait for the serial port to connect. I have tried to fetch the data from these two devices individually and it successfully working. J-M-L May 5, 2021, 12:09pm 2. Don’t connect these pins directly to an You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc. Arduino Board; Circuit Dec 21, 2021 · 4. UART Serial2(8, 9); // did not compile. Arduino Board. The models provided in this example are preconfigured for the Arduino Mega 2560 board. Finally, we will build a real-world Introduction. write() will return before any characters are transmitted over serial. Jul 21, 2022 · Make sure that your Arduino board is attached to your computer via USB to enable serial communication through the serial monitor window of the Arduino Software (IDE). Some boards use this port for SPI Flash access though. for debugging purposes) in Arduino models that have only one serial (Ex . 2) Need to use multiple Serials. In the config file, bluefruitConfig. Aug 18, 2023 · The example on the GitHub for this library [https://github. Nov 10, 2015 · This video clip shows how to connect an Arduino Uno and Arduino Mega using the HARDWARE tx and rx communication configuration. For more circuit examples, see the Fritzing project page. This example shows how to use the Serial Transmit and Serial Receive blocks from the Simulink® Support Package for Arduino® Hardware to transmit and receive data between your host computer and Arduino hardware using a USB to serial converter. Instant dev environments. multi-master, multi-slave) RS485 communication library. You can also enhance the code in Serial Monitor is one of the tools in Arduino IDE. 10k ohm Potentiometer. To use this library. Communication. From the Groups list under Target hardware resources, select Serial port properties. For serial communication, rosserial provides a protocol for wrapping standard ROS serialized messages and multiplexing multiple topics over a serial device. Connect the three wires from the potentiometer to your board. But when compiling I get the following error. Instead, you can use the available() method. Then, we’ll send those data points one-by-one over the UART serial print and use the Arduino Serial Plotter to plot the incoming data points. h> /* This sample code demonstrates the normal use of a TinyGPS object. Doubts on how to use Github? Learn everything you need to know in this tutorial. ( 12) The NFC module PN532 is a smart card reader that, among other things, activates a mechanism when the correct card is presented to the reader. 2. SoftwareSerial mySerial (2, 3); // RX, TX. Releases Jan 6, 2024 · ROS, or the Robot Operating System, is a flexible framework for writing robot software. Security. Copilot. Arduino has a Library of Software Serial in it. You begin a serial communication in the setup() function at a baud rate of 9600. Connect the Arduino pin (selected as TX) to the RX of the serial sensors/devices. This library supports an RS485 transceiver connected to the USART (Tx/Rx) pins of the Arduino in a half-duplex, concurrent multi-drop environment. It allows for bidirectional data transfer, enabling seamless Feb 6, 2023 · This example demonstrates multi-byte communication from the Arduino board to the computer using a call-and-response (handshaking) method. In this case, in detail, the Arduino board communicates with: Among them, the communication between Arduino and Serial Monitor of Arduino IDE is the most common-used by Arduino learners. We will use three buttons to achieve this. mvermand June 16, 2021, 2:33pm 3. And …. But due to hardware limitation, Arduino UNO can only listen to one software serial at a time. based on Mikal Hart's example. In this case, each character found is added to a string until a newline is found. So, my ESP32 pinout says Serial The serial communication enables us to control electronic devices connected to Arduino board from PC. We MUST connect ESP8266 and PC via a USB cable in order to use Serial Monitor. Thus, if you use these functions, you cannot also use pins 0 and 1 for ESP32 Serial Plotter in Arduino. This example code is in the public domain. Simple Interrupt Example 1 The goal of this tutorial is to demonstrate the use of this module with Arduino, using the push buttons to instruct the Arduino to send serial commands to the module and control mp3. As I want to do it more professional via Sep 4, 2023 · ESP32 UART tutorial with example of esp32 to esp32 serial data transfer, set pins with hardware serial using Arduino IDE. Things that are not used in the examples. Apr 16, 2012 · RX is digital pin 2 (connect to TX of other device) TX is digital pin 3 (connect to RX of other device) created back in the mists of time. Serial is used for communication between: An Arduino board and computer. You can view the received data on any serial terminal in your computer. Copy the sketch below to your Arduino IDE and upload it to your Arduino board. The Arduino has a built-in USB connection that allows it to connect to a computer and send data back and forth. write() will block until there is enough space in the buffer. It can be found in smartphones, for example. Oct 26, 2023 · I am trying to use a GlobalSat BU-353-S4 USB GPS puck that attaches through USBHost port and can not seem to find any examples that show how to use usbserial. If you remember from the earlier guide, the best option is AltSoftSerial followed by NeoSerial with the default SoftwareSerial at the end. The speed parameter is the baud rate that we want the UART to run. write(), you can first check the amount of free space in the transmit Jun 2, 2022 · I am trying to connect the Adafruit Bluefruit LE UART Friend to an Arduino Nano Every. Data is exchanged between Serial Monitor and Arduino via USB cable, which is also used Arduino Cookbook by Michael Margolis. There are SoftwareSerial examples in the IDE. Circuit. In my first projects i read some measured from a photo sensor and a LED. Specifically, we'll cover the following aspects in detail: Establishing the connection between Arduino and the TTL to RS485 module. There are a few differences in the APIs depending on the transport, but the majority of the functions are the same for both. Serial1 (opened with Serial1. Edit: Ignore this post. The Mega is the master sending #serial #hardware #software #multiple #serial #arduino Highlights of this video are: 1) What is Hardware Serial. begin(9600); serialOne. This tutorial can be so loaded on boards that have two different UART interfaces on the 0 and 1 pins and the USB port (like Zero, MKR1000, 101). Concurrent multi-drop (i. \HardwareSerial1. In particular every data coming from the RX pin of the Serial1 is transmitted to Serial and vice versa. This function is automatically called at the end of loop when there is serial data available in the buffer. Then the string is printed and set back to null. by Tom Igoe. Hardware Required The parseInt () function from the Serial library is made to scan down the serial receive buffer one byte at a time in search of the first valid numerical digit. Jan 11, 2013 · What i am trying is, to transmit a data, for example, "Serial. hook-up wires. 3V depending on the board). Leo. Reload to refresh your session. f. The Mega is the master sending Jul 30, 2021 · While Arduino Uno has a single Hardware Serial, other boards like Mega have multiple. * U0UXD is used to communicate with the ESP32 for programming and during reset/boot. Programming Arduino to transmit data to the Select any two Arduino pins: one for RX (e. The code example down below defines a sine waveform lookup table consisting of 32 values (Array of integers). May 13, 2024 · Notes and Warnings. Arduino Mega Board int length = 10; char buffer [11]; char termChar = 13; int numberOfBytes = Serial. The RC522 module is certainly the best known RFID module in the Arduino world, but in this tutorial we will see how to use the PN532 RFID reader Arduino Examples. Chapter 4. It serves two functions: ESP8266 to PC: Receiving data from the ESP8266 and displaying it on the screen. Then in the loop() function it prints “HI!” continuously every 1 second (that message will be received by your ESP later). If you uses SoftwareSerial to connect to the RS232 to TTL Module The most common issue with serial ports on Teensy is use of code designed for Arduino Uno with Serial within the code. parseInt (). A second switch-case example, showing how to take different actions based on the characters received in the serial port. If you need a second pair, then you can do that in software. Jun 16, 2021 · Serial 2 / UART crashed USB. To communicate with an Arduino, rosserial_arduino allows your ROS-enabled computer to interact May 13, 2024 · Arduino Mega example: This code sends data received in one serial port of the Arduino Mega to another. (like how we enable GIE,PEIE in PIC, and write ISR) The Arduino "core" code handles the actual serial interrupts, and there isn't really any good way for you to intercept them in sketch code. Programming Arduino to retrieve data from the TTL to RS485 module. Here provides an example for multiple software serial: Serial. Buy on Amazon. Which should be a, roughly looking, sinusoidal waveform. The Arduino UNO board has a main microcontroller Atmega328p and another Atmega16U microcontroller acting as a USB-To-TTL (USB-UART) converter which enables us to send serial data using UART to the PC’s USB port. #include <SPI. Please note that, there is a special case. parseInt() Jun 28, 2016 · e. Note The USB CDC Serial-overUSB, and two hardware UART devices. begin( speed). They are accessed using Serial, Serial1, Serial2, and so on. The command simply reads the data until it finds the terminating character. e. In this model, the GPS Shield sends data to the Serial port 1 of the Arduino hardware. 2008 modified An Arduino AVR library to add hardware flow control via RTS/CTS to the serial ports. This can be used, for example, to connect a serial device to the computer through the Arduino board. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB. h>. Schematics. Please note that serialEvent() does not work on any modern Arduino boards. May 13, 2024 · Description. On Teensy, Serial accesses the USB only. Write better code with AI. reading time: 8 minutes Oct 8, 2015 · The Arduino sketch for this tutorial is very simple. Connect three wires to the board. 0. I have connected HC-05 Bluetooth module to TX/RX pins of Arduino Mega, using a DPDT switch in-between, so that I can disconnect TX/RX line while uploading the code. With an Arduino board, you can use the serial port to communicate with other microcontrollers or computers. It requires the use of SoftwareSerial, and assumes that you have a 4800-baud serial GPS device hooked up on pins 3(rx) and 4 Programming is accomplished through the popular Arduino IDE connected to the USB-to-Serial converter with USB-C connector, automatic bootloader and reset. I also can reassign which pins are used for UART transmissions. This example works only with boards with more than one serial like Arduino Mega, Due, Zero etc. I heard that if you use the hadware serial you cant transmit the recived data to the serial Monitor. Find and fix vulnerabilities. This library allows you to communicate with SPI devices, with the Arduino as the controller device. On Leonardo/Mega you can connect a separate USB-serial adapter to RX & TX pins and use serial monitor to mirror what those pins are doing. For more circuit examples, see the Fritzing Jan 11, 2023 · In the IDE there are examples for using both software serial And the hardware serial. Dec 31, 2018 · ESP32 Hardware Serial2 Arduino Example Code. If you are using any other serial port pins for communication 1 day ago · Description. Serial communication on pins TX/RX uses TTL logic levels (5V or 3. You signed in with another tab or window. If you are using any other serial port pins for communication Nov 10, 2015 · This video clip shows how to connect an Arduino Uno and Arduino Mega using the HARDWARE tx and rx communication configuration. h> #include <TinyGPS. begin(115200) for example) on Wemos D1 mini pro uses UART0 of ESP8266, which is mapped to pins TX (GPIO1) and RX (GPIO3). 10k ohm resistor. All Arduino boards have at least one serial port (also known as a UART or May 15, 2021 · Hi, I am working on Distance measurement project using LIDAR TF-Mini-S and Arduino Mega. Dec 8, 2022 · In this example you will monitor the state of your potentiometer after establishing serial communication between your Arduino and your computer running the Arduino Software (IDE). ino] Shows a call to Serial1. The master Arduino transmits the commands: // Arduino Serial Example #1 Remote Control Blink - Master void setup () {. This is usually used for debugging and monitoring. Using the Arduino nRF52 cores, you can program digitalWrite I/O, analogRead ADC pins, Serial print to the Serial monitor, interact with hardware serial using Serial1, and even perform more complex I 2 C or SPI writes with the Wire and SPI libraries. Some Arduino boards have multiple “ hardware “ ports such as the Nano Every and the Mega . So if you have “314” in the serial receive buffer, you’d get 314 returned the first time you call Serial. For now, I am just trying to run the atcommand example sketch that comes with the library. If the transmit buffer is full then Serial. dq td qe qd iu he xr iw rg gr