I2c code for arduino // Arduino MASTER sketch #include <Wire. Hello guys, I've been trying to learn how to connect sensors to Arduino with I2C to read data. Different Arduinos support at least one I2C port. Give it a try DHT11 (3 pins version) wired with LCD i²c and an Arduino . Pin A4 is SDA and pin A5 is SCL. Here is the code. How to force Wire. cpp (7. Here's my Arduino code: #include "Wire. Code. I'm using the Wire library. Codes. This module communicates with the Arduino via I2C, so you only need two connections to read the time. multiple i2c devices with arduino. The 5V i2c can be adapted to lower voltage controllers (e. Each device is built to make use of the generic "I2Cdev" class, which abstracts the I2C bit- and byte-level communication away from each specific device class, making it easy to keep the device class clean while providing a simple way to modify just one class to port the I2C communication code onto different platforms (Arduino, PIC, MSP430 Thank you for your reply. h> int ADDRESS = 0xDE; #define data_X0 0x1F int X0,X1,X_out; void setup() { // put your setup I was wondering whenever anyone has or could share simple code to set/retrieve time on a DS3231. The reason behind this is that I eventually want to hook the attiny up to a esp8266, since that chip doesn't have any usabe analog pins. Connect the SDP Sensor to your I've recently bought a ATTINY85, with the idea to read analog data, and send it out digitally over i2c. Connect the SDA pin of an LCD display to the SDA Learn How to interface a 1. h” library that you already Measure temperature/humidity using DHT22 + LCD i2c + Arduino; Measure Temperature / Humidity and Heat Index using DHT 21 (AM 2301) + Arduino + LCD; Measuring temperature and humidity using AM2320 (DHT12 For Arduino UNO (known as active I2C slave), the address is assigned by the user (the programmer) by including the following codes in the sketch: Slave Codes: #include<Wire. The Arduino Uno board has only one I2C module, but it provides these SDA and SCL line at two different locations. 7. begin() to take say, 6 and 7? According to this page, it should be addressed, but I don't know how. h> // Connect via i2c, default address #0 (A0-A2 not jumpered) LiquidCrystal lcd(0); void setup() { // set up the LCD's number of rows and columns: lcd. 1. h (624 Bytes) I2C. For example, on a MKR WiFi 1010, the SPI bus is attached to pin 8 & 11. Now let’s make the code that will get the data for the X axis. I need to perform some slow operations before replying to the I2C master, and I need to use the clock stretch feature in order to keep the master waiting. On Arduino boards with the R3 layout, the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. h> void setup() { Wire. You find the list with pre-defined addresses in src/SensirionI2cSht4X. Things used in this project . The developers over at Arduino produce an I2C library for us, they called in Wire. println() functions print text to the "serial monitor". begin(16, 4 Hi, I'm a newbie at Arduino programming. I2C SSD1306 OLED. More info: www. h" #include "TM1637Display. Breadboard; DHT11 Temperature and Humidity; HC-SR04 Ultrasonic Sensor; IR Obstacle Sensor (HW Robojax Crash Course on Arduino: Learn Arduino in 30 Minutes (code and video) Learn Arduino step by step from beginner to Advance (Coruse) Get Early Access to my videos via Patreon; Arduino Code for LCD2004 with I2C Hello World sketch. 1 /* DHT-22 sensor with 12c 16x2 LCD with Arduino uno 2 Temperature and humidity sensor displayed in LCD 3 based on: Get started with Arduino by running Hello World program that prints Hello World on Serial Monitor. arduino. Friends I am trying to get data from the WNK81MA sensor that uses an i2c communication protocol, I have the built-in assumption that it is the ZSC31014 but when asking for the bytes Create a new sketch, replace the empty sketch with the i2c_scanner code ( Arduino Playground - I2cScanner). Here is the code for connecting I2C OLED SSD1306 and I2C INA219 on ESP32 which will works simultaneously. 24 . Arduino Uno board has I2C pin shown in below image. So remove the Tx, Rx wires and connect SDA & SCL Pin of the sensor to A4 & A5 of Arduino Board. Arduino Forum 4x4 matrix keypad with all alphabets code with arduino using i2c with sx1509. Click here to learn more about the SDP8xx series Sensor Evaluation Kit. Pin connections for wiring an Arduino MEGA 2560 to the OLED The number passed to the the Adafruit_SSD1306 constructor as shown in the above code is the number of the Arduino pin used to reset the display for displays that Like many on this discussion group, I bought an I2C LCD device for my Arduino only to find that the documentation is either non-existent or, if it does exist, just wrong. Connect the SEN5X Sensor to your Arduino board's standard I2C bus. Hardware components: Arduino UNO: Code . This library can be installed through the Arduino Library Manager. Give it a try and check the Arduino I2C Tutorial linked below for more information about Arduino I2C communication. Tutorials. Arduino is saved/installed to the e drive to speed up he computer. Upload it. 9V to Barrel Jack Connector. The pinout of the SEN5X Sensor board can be found in the data sheet. h> #include <LiquidCrystal. h> Testing I2C Code & Switching from I2C-to-UART Mode. begin()” Writing Data to a Perhiprial I2C 16x2 Arduino LCD Display Module. The I2C protocol is supported on all Arduino boards. Networking, Protocols, and Devices. 37 This example code is in the public domain. About. دروس آردوینو به فارسی. I2C, demo code is provided in website that support specific microcontroller which has more than 1 UART port, I am using ESP32 /ESP8266 which has only one UART port. write16(address, registerAddress, data). Arduino I2C Pins . If the LED color is blue then the Ph Sensor is in I2C Mode. The reason I ask (I understand there are plenty of libraries available for this) is because i often have to port to different mcu's and it would be nice to have a single piece of code i could call as a function rather than having to How to Connect the Geekcreit 0. I2C Tutorial for Arduino, ESP8266 and ESP32 In this tutorial we dive deeper into the I2C communication protocol. Simulate. The circuit remains the same as they both are I2C EEPROMS with same pins and code needs very small modifications. We’ll discuss all 3 possible I2C communication scenarios and create 3 different I2C communication Arduino projects to In this video we learn how to use HT16K33 I2C 4 digits seven segment display with Arduino. The LCD Pinout. The code referenced is for Earle's core. begin(slaveAddress); //put any value from 0x08 (0b0001000) to 0x7E (0b1111110) in place of slaveAddress. The intention of the project is for Arduino 1 to receive inputs via touch sensor 1/switch button 1/ switch button2/ switch button3, which will in turn have a LED light output via both Arduino 1 and 2. ' 9 # define SPRITE_JUMP_LOWER 4 10 # define SPRITE_TERRAIN_EMPTY ' ' 11 # define SPRITE_TERRAIN_SOLID 5 12 # define For Arduino UNO (known as active I2C slave), the address is assigned by the user (the programmer) by including the following codes in the sketch: Slave Codes: #include<Wire. h>” to the start of the sketch; In void setup(), add the line “Wire. 1 /* DHT-22 sensor with 12c 16x2 LCD with Arduino uno 2 Temperature and humidity sensor displayed in LCD 3 based on: Note that each Arduino Board has different I2C pins that must be connected correctly. If anyone have done any coding regarding this, please provide me. The library I used is a QMC5883 library: Download library here. Save it. 7k resistors I had was 3. You learn which practical examples: which pins you need for Arduino and ESP8266 microcontroller to connect devices through I2C. Also, we declare and initialize a variable x with zero. Hi, I am trying to code for arduino using sx1509 IOExpander for 4x4 keypad with keypad having all alphabets in it. My I2C code files: I2C. h" int address = 112; //0x70 in decimal int temp_reg = 31906; //0x7CA2 in decimal void First do a I2C send reset by writing the hex code to the sensor address Second store the sensorbitmap Then write to the mod registers. Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface. Typically used to send a single byte of data to a register address NOTE: For devices with 16-bit register addresses use I2c. Arduino 16x2 Display Overview of LCD I2C 16x2. I2C (or I2C, or IIC as it is sometimes called, stands for Inter-Integrated Circuit and is a synchronous serial protocol which was developed to facilitate communication between micro-controllers and external peripherals (like In this tutorial, we will learn to use the I2C communication port of Arduino. This is code for LCD1602 Display with I2C module You can use this code to display code using only 4 wires which uses I2C communication protocol. To use this example, make sure you have the Adafruit SSD1306 library installed. We will learn to configure Arduino as an I2C master and an I2C But if that’s your thing, there’s some more advanced I²C code examples over at the Gammon Forum, an in depth reference to the Wire library at the Arduino playground , and some troubleshooting tips over at Hackaday. h> 3 # define PIN_BUTTON 2 4 # define PIN_AUTOPLAY 1 5 # define SPRITE_RUN1 1 //Car sprite 6 # define SPRITE_RUN2 2 7 # define SPRITE_JUMP 3 8 # define SPRITE_JUMP_UPPER '. Pin D13 will turn on and off depending on received value from a master device. h In this guide, you’ll learn how to expand the I2C bus ports (ESP32, ESP8266, Arduino) using the TCA9458A 1-to-8 I2C Multiplexer. I suspect that is sufficient for many situations. It has four pins: Learn how to use RFID NFC RC522 with Arduino, how to connect RFID-RC522 module to Arduino, how to code for RFID/NFC, how to program Arduino step by step. If you need to transfer data over a large distance, this protocol is not recommended. To conclude this tutorial, we can say that the Arduino I2C scanner code example is very useful in case you can’t identify the address of a specific I2C device on the bus or to check the existence of a specific I2C device on the bus. h" // wrapper class for I2C . General Guidance. Unleash your creativity now! DS1307 Real Time Clock and Arduino: Complete Setup and Code Tutorial; Input and Sensors. 1 3 //Code by Dana Dietz with the help of Jeremy Blum, Sunfounder and others who wrote lcd code 4 //My first code using I2C 5 //LCD 1602A with backpack PCF85724T (I2C) 6 //This example shows you how to use the LCD with an I2C backpack 7 //It shows you how the I2C only accepts one bit I2C 16x2 Arduino LCD Display Module. Wiring an I2C LCD Display to an Arduino. Tinkercad is a free web app for 3D design, electronics, and coding. We provide detailed instructions, code, wiring diagrams, 0x27 is the address of my I2c device, for these displays, there are usually two 0x27 or 0x3F, in case you’re unsure about the correct one I recommend you to download and run the I2c_scanner code from Arduino playground Check here, Don’t forget to run the code while your device is plugged in, then modify the address accordingly. With this setup, I was able to get correct temperature/humidity reading from using the sparkfun library for SHTC3 source. It is also in the menu : Tools / Serial Monitor Ctrl + Shift + M The I2C bus for a Arduino Uno is at pin A4 and A5. : 3. We’re You just found the perfect I2C sensor, and you want to wire up two or three or more of them to your Arduino when you realize "Uh oh, this chip has a fixed I2C address, and from what I know about I2C, you cannot have two devices with the same address on the same SDA/SCL pins!" Are you out of luck? You would be, if you didn't have this ultra-cool I'm trying to get I2C working between an Arduino Nano and an ESP8266. com */ // Include the libraries: #include "RTClib. begin(0x53); // join i2c bus (address optional for master) Serial. 0 2 //Library version:1. First, we define the symbolic name for pin D13 of Arduino. h> “. It allows you to connect several peripheral devices, such as sensors, displays, motor drivers, and so on, with only a few wires. Check the pinout of your Arduino board to find the correct pins. Learn how to use RFID NFC RC522 with Arduino, how to connect RFID-RC522 module to Arduino, how to code for RFID/NFC, how to program Arduino step by step. h, add “#include<Wire. Begin by connecting the VCC pin to the Arduino’s 5V output and the GND pin to ground. Many times the libraries and demonstration code indicate a certain I2C address for the component, but the Arduino is unable to find the component at that Address. You want to make a cool Arduino robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. here is the code for the master. We’ll start off by discussing some Arduino I2C communication basics and fundamentals as a quick review of A simple two-way communication between two Arduino Boards using I2C Communication is demonstrated in this tutorial. g. to get started, I programmed the attiny with the arduino IDE with this code: #include "TinyWireS. Also connect the power pins to 3. com. You might find this tutorial for the ADXL345 to be useful: ADXL345 Hookup Guide - SparkFun Learn Example I2C code for data request (different sensor), showing how to use requestFrom(): Using the Arduino Wire library I2C is limited to sending packets of not more than 32 bytes. In this project, we’ll do an I2C Communication Between Two Arduino Boards. How To Print Hello World in 16x 2 LED with I2C. The 0x30 is the sensor/device I2C address being connected // Simple I2C master Hello, I have: 1 ARDUINO UNO R3 1 16x2 QAPASS LCD 1 I2C MODULE (FC-113) (Attachment 2) I have connected them as attachment 1 (this is a true connection i am sure) I also use this library : GitHub - kiyoshigawa/Liqu I am testing a very very simple i2c wire code for the raspberry pi pico using the arduino IDE, This simple code breaks the pico and after uploading it, it will make the pico into an unrecognized usb device. The second Arduino will operate as an I2C slave receiver, tasked with receiving data from the master device and utilizing it to regulate a PWM output, such as an LED. h. So we will use the Arduino Wire Library which has to be include in the sketch. We’ll also discuss some Arduino I2C communication basics and fundamentals as a quick review of what we’ve previously learned in more detail in this previous Arduino I2C Tutorial. In Arduino Uno / Nano / Pro Mini I2C bus is connected to A4 (SDA) and A5 (SCL), for Arduino Mega 2560 I2C bus is connected to D20 (SDA) and D21 (SCL) Here I am going to show you how to scan I2C address with a simple code. 39 https://docs. It seems to me the that when my onRequest() callback get called my code must reply, no matter what, but the Arduino I2C Pins. Projects. But its not working,can you help me in that. We know that you also asked it at StackExchange: arduino uno - Communicating with magnetic sensor - TLV493D-A1B6 over I2C - Arduino Stack Exchange. Here is a simple program that reads the temperature, relative humidity, pressure, and approx. which has a capacity of 4 kb (4096 bits or 512 B), for demonstration. . You only need to connect four pins. For my school project, I'm using Arduino Uno Master-Slave i2c comms. A challenge in many Arduino projects is that it can be difficult to get I2C components working properly. One Arduino will serve as an I2C master transmitter, responsible for reading an analog input from a potentiometer and transmitting it to the I2C Slave Arduino board. 96 Inch OLED I2C Display to Arduino – Wiring Diagram Arduino MEGA 2560 OLED Wiring. Similarly, Arduino Uno also has one I2C port. Find this and other Arduino tutorials on ArduinoGetStarted. Please check the attached document for the code and serial monitor output. Arduino LCD 20×4 I2C Example. Learn how to get time, date, day of week, month, year in Arduino using Real-Time Clock DS1307 module, how The provided example is working with a SHT40, I²C address 0x44. Wireless & IoT. Jumper wires (generic) Project description. greetings to all . makerguides. UART (TX/RX) mode 2. Hello, I am totally new to arduino but have been doing a lot of reading about using arduinos and servos to control turnouts on a model railroad. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. 3V. As the Arduino is communicating with the display using SPI, pin 11 & 12 will change depending on what board you are using. #include <Wire. & I want to use I2C Step 2: Import “LiquidCrystal_I2C. This piece of hardware is useful if you want to control multiple I2C devices with the same I2C address. 3 Inch OLED Display example code, circuit, pinout, library Craft unique characters for Arduino and I2C LCD: Step-by-step guide to create custom symbols, icons, and designs for your display. Libraries: DHT library: Download library here. humtemp. 3V - RPi, Arduino Due, ESP-8266, etc. cc Arduino 16x2 LCD Display with I2C - Hello World. Open the serial monitor. Here first we have to define the sensor address and the two internal registers Hello friends, greetings. The LCD I use is a i²c it has only 4 pins and easier than the standard version. Its Arduino I2C Code. I'm writing the code for a I2C slave Arduino (Nano Every, if it matters). www. 6. Giving you lots of flexibility and speeding up your prototyping, without an abundancy of wires. In order to use the code with another product or I²C address you need to change it in the code of examples/exampleUsage. It is highly recommended to use the LCD I2C instead of standard LCD. Click the Upload button in the Arduino IDE or Sketch Upload Hi, I am looking for how to read I2C output using Arduino Uno. 38. Having spent the last few nights trying out all the how to use a 16x2 LCD I2C interface with an Arduino UNO R4, how to connect LCD I2Cto Arduino UNO R4, how to program Arduino UNO R4 to display text on LCD I2C, how to program Arduino UNO R4 to display numbers on LCD I2C, how to program Arduino UNO R4 to display custom characters on LCD I2C . Pico has several I2C lines. h> byte i2c_rcv; // data received from I2C bus unsigned long time_start; // start time in milliseconds int stat_LED; // status of LED: 1 = ON, 0 = OFF byte value_pot; // potentiometer position void setup() { Wire. It is identical except registerAddress is a uint16_t Run your SFM3300 with Arduino with just 10 lines of code (not counting the usual Arduino initialization stuff) SFM3300_Original_CRC: As is it will work fine with any AVR based 5V Arduino board. h> const int SLAVE_ADDRESS = 8; //Slave arduino ID int Note that this circuit was originally designed for the Arduino UNO. 2: 699: May 6, 2021 Help, multiple i2c buses esp32. I2C is a low-speed serial communication protocol used for transferring data over short distances. 0 KB) Overview The Portenta H7 has THREE (3) I2C busses available. Now, let’s test what we’ve learned so far about the Arduino LCD 20×4 I2C and create our first project to display text messages on 4 separate lines of This is the Sensirion SDP library for Arduino using the modules I2C interface. h (Arduino I2C library) Import Wire. Note: While communicating with This method is used for scanning the I2C Device inside your module that connected to I2C bus in Arduino (SDA, SCL). the advantages and disadvantages of this communication protocol how to use a I2C multiplexer Table of Contents The [] Fortunately, we do not have to develop an I2C implementation for ourselves. Advanced Full instructions provided 65,869. Define header file in the code ” #include <LiquidCrystal_I2C. Koepel: The Serial. LCD I2C is made up of a standard LCD, an I2C module and a potentiometer. In Arduino, when I scan I2C lines it is scanned only on 0 and 1, as default. It is a small button in the upper-right corner of the Arduino IDE (a quare button with dots and a magnifier). DHT22 Temperature Sensor. Learn more about using the OLED display with the Arduino: Guide for I2C OLED Display with Arduino. 12: 5154: October 2, 2023 We’ll move now to the practical code examples to test the Arduino I2C LCD display. Code – Display MPU-6050 Sensor Readings on OLED Display. begin(); // join I2C bus as the master // initialize global variables 1 #include <LiquidCrystal_I2C. by Bryan Siepert and 1 other contributor Contributors: Isaac Wellish; published August 04, 2019, last updated August 04, 2019 Once you upload the code, you will see the wiper settings and measured voltage being printed when you open the Serial To conclude this tutorial, we can say that the Arduino I2C scanner code example is very useful in case you can’t identify the address of a specific I2C device on the bus or to check the existence of a specific I2C device on the bus. Search for “ LiquidCrystal I2C ” and install the “ Are you having issues with your I2C Arduino codes? Do you want to do some low-level debugging on it? This article will help you by discussing in-depth I2C concepts. altitude from Arduino I2C Slave Device Code. The LCD I2C uses the I2C interface to connect to Arduino Nano. Delete image . begin(9600); // start serial for output } void loop() { Note that this circuit was originally designed for the Arduino UNO. First, use the I2C address scanner to check your wiring and communications. using 1. Code Optimization: It refers to minimizing the (i) execution time by placing the variable in the processor register and (ii) usage of memory space by reducing the number of code lines. Arduino Library Commands. The In my code a master receives three types of data from the slave, and it send data of a fourth variable to the slave. 1 //Compatible with the Arduino IDE 1. ) using a simple level converter with two low This can be used // to print the reading in cases where the command succeeds for example void receive_and_print_reading (Ezo_board &Device); // used to handle receiving readings and printing them in a common format // typical use case is calling it 1 second after sending the send_read_cmd function from the Ezo_i2c_lib void receive_and_print_response (Ezo_board Learn: how LCD I2C works, how to connect LCD 20x4 to Arduino, how to program Arduino step by step. As: Wire //like "Wire0", as I2C0 on breakout and I2C on Digital Header, but as I2C3 on MCU itself //this is the "User I2C" Wire 1 //as I2C1 on breakout - It is the NCV7685, I know that because of his similar question here: On Semi I2C NCV7685 LED Driver - Software - Arduino Forum. Basic Electronics Arduino ESP32 ESP8266. Click here to learn more about the SDP3x Sensor Evaluation Kit. the library is written by Rob Tillaart Posed on /* * This is Arduino code for HT16K33 4 digits seven Hi all. Open Arduino IDE and navigate to Tools>Library Manager. Step 3: Connect display device to Arduino. 4-673-g8cd3697 from GitHub - esp8266/Arduino: ESP8266 core for Arduino Master[ESP8266]: #include <Wire. Should I remove it from C:/program86x/arduino? Learn to control I2C LCD with Arduino along with pinout, wiring, finding I2C address, adjusting contrast, arduino code, create and display custom characters. This variable x will be used to store the value received from a master Arduino. I tested This library calls the Arduino standard I2C/Two-Wire Library. Anthropous March 13, 2016, 9:49pm 5. That is because using the LCD I2C make the wiring much easier. h” header file in the code. What else are you expecting then what we have already written ? Adafruit DS3502 I2C Digital Potentiometer Arduino Adafruit DS3502 I2C Digital Potentiometer. Library. arduino. komal_dhiman November 1, 2022, 11:51am 1 In this tutorial we’ll take a look at the I2C communication protocol with the ESP32 using Arduino IDE: how to choose I2C pins, connect multiple I2C devices to the same bus and how to use the two I2C bus interfaces. You learned about Arduino I2C Peripheral, few important basics of I2C Communication, the Wire Steps to interface LCD display with Arduino: Step 1: Install the library for LCD display in Arduino IDE. /* Arduino example code to display a 24 hour time format clock on a TM1637 4 digit 7 segment display with a DS32321 RTC. Setting up Wire. Here is the Atlas Ph Sensor Arduino Code for I2C communication. Arduino Example Code. This is a remix of Lcd Display with I2C Hello World by Ivan bacarro. A simple tutorial on using AT24C256 I2C EEPROM with Arduino. You have to open the "serial monitor". 9k. This is the ultimate seven segment display. Now we are left with the pins that are used for I2C communication. I wrote one program to read the I2C output form the on e semiconductor ic. HMC5883L Wired with Arduino UNO . I'm using the ESP8266 Community libs v1. Codes For i2c scan: i2c Scanner: Download here, it’s a separate code that uses “wire. eg: User presses Switch Button 1, and it triggers only Blue First off, thank you for writing this! I gave it a whirl talking (or not, heh) to a AD5171 digital cap, I didn't get any output from pin5 or pin7 on the attiny, though I discovered when i was hooking it up that the closest to 4. Components The circuit: * 5V to Arduino 5V pin * GND to Arduino GND pin * CLK to Analog #5 * DAT to Analog #4 */ // include the library code: #include <Wire. An example of a simple I2C network is shown below: As you can see in the diagram In this tutorial, we’ll discuss the Arduino I2C Slave Set Up procedure and how to set your Arduino as an I2C Slave device. h> 2 #include <Wire. I2C is an acronym for Inter-Integrated Circuit. LCD i2c New_Liquid_Crystal library: Download LCD i2c library here . You can connect the BH1750 sensor to the Arduino using the default’s I2C pins (these are the pins for the Arduino UNO, if you’re using another model, check its I2C pins): BH1750: Copy the following code to your Waveshare Time of Flight Sensor B recently I purchased a TOF Sensor, according to website support there are 2 option to use this TOF Sensor 1. I have written this code for an arduino mega hooked up to 25 toggle switches and 6 servos with an I2C connection to 2 unos as slaves with the rest of the servos. The getData( dist, flux, temp, addr) All of the code for this Library is richly commented to assist with understanding and in problem solving. @ammc Please be clear if you asked the question before or even on another forum. It will report the discovered addresses. Likewise for the temperature sensor on chip. Basics of AT24C256, AT24C04 EEPROM and Arduino AT24C256 EEPROM Interface. 3 Inch I2C OLED Display Module with Arduino. cc The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. I'd like to share my code for Portenta H7, my experiences and hints for using I2C on Portenta H7. Description: Initiate an I2C write operation, sending a single data byte. This code prints simple Hello World text on screen It has 8 pins wired with Arduino Digital pins and the Matrix should be declared in the code, you’ll find examples in the Arduino Keypad built-in library. Connecting an I2C LCD is much simpler than connecting a standard LCD. The second code works Lcd Display with I2C Hello World! Simple Calculator.
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