SENSORS/ACTUATORS

Arduino Nano 33 IoT - Keypad - LCD

This guide shows you how to use the Arduino Nano 33 IoT with a keypad and an LCD screen. We will learn how to write a simple program to display the key you press on the LCD.

Hardware Preparation

1	×	Arduino Nano 33 IoT
1	×	Micro USB Cable
1	×	LCD I2C
1	×	Keypad
1	×	Breadboard
1	×	Jumper Wires
1	×	Optionally, DC Power Jack
1	×	Recommended: Screw Terminal Expansion Board for Arduino Nano
1	×	Recommended: Breakout Expansion Board for Arduino Nano
1	×	Recommended: Power Splitter for Arduino Nano

Or you can buy the following sensor kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .

Overview of Keypad and LCD

If you're new to using the Keypad, LCD, and Arduino Nano 33 IoT, please check out these tutorials:

These tutorials explain how Keypad and LCD work, their pinouts, how to connect them to the Arduino Nano 33 IoT, and how to program Arduino Nano 33 IoT to work with the Keypad and LCD.

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Nano 33 IoT Code - Keyoad 3x4 - LCD I2C

/* * This Arduino Nano 33 IoT code was developed by newbiely.com * * This Arduino Nano 33 IoT code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-keypad-lcd */ #include <DIYables_Keypad.h> #include <LiquidCrystal_I2C.h> #define ROW_NUM 4 // four rows #define COLUMN_NUM 3 // four columns const byte pin_rows[ROW_NUM] = {10, 9, 8, 7}; // The Arduino Nano 33 IoT pin connected to the row pins of the keypad const byte pin_column[COLUMN_NUM] = {6, 5, 4}; // The Arduino Nano 33 IoT pin connected to the column pins of the keypad char key_layout[ROW_NUM][COLUMN_NUM] = { {'1', '2', '3'}, {'4', '5', '6'}, {'7', '8', '9'}, {'*', '0', '#'} }; DIYables_Keypad keypad = DIYables_Keypad( makeKeymap(key_layout), pin_rows, pin_column, ROW_NUM, COLUMN_NUM); LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows int cursor = 0; void setup() { lcd.init(); // Initialize the LCD I2C display lcd.backlight(); } void loop() { char key = keypad.getKey(); if (key) { lcd.setCursor(cursor, 0); // move cursor to (cursor, 0) lcd.print(key); // print key at (cursor, 0) cursor++; // move cursor to next position if (cursor == 16) { // if reaching limit, clear LCD lcd.clear(); cursor = 0; } } }

※ NOTE THAT:

The LCD's I2C address might change depending on the maker. In our code, we used the address 0x27 as provided by the manufacturer DIYables.

Detailed Instructions

If you are new to the Arduino Nano 33 IoT, be sure to check out our Getting Started with Arduino Nano 33 IoT tutorial. Then, follow these steps:

Connect the components to the Arduino Nano 33 IoT board as depicted in the diagram.
Use a USB cable to connect the Arduino Nano 33 IoT board to your computer.
Launch the Arduino IDE on your computer.
Select the Arduino Nano 33 IoT board and choose its corresponding COM port.
Click the Library Manager icon on the left side of the Arduino IDE.
In the search box, type DIYables_Keypad and find the keypad library from DIYables.io.
Press the Install button to add the keypad library.

Type LiquidCrystal I2C in the search box and find the LiquidCrystal_I2C library by Frank de Brabander. Then click the Install button to add the library.

Arduino Nano 33 IoT LiquidCrystal I2C library

Copy the code above and paste it into the Arduino IDE.
Click the Upload button in the Arduino IDE to compile the code and send it to your Arduino Nano 33 IoT board.

Tap some keys on the keypad.
Look at the result on the screen.

If your LCD screen is blank, please see the LCD I2C troubleshooting guide at Troubleshooting on LCD I2C.

Line-by-line Code Explanation

The Arduino Nano 33 IoT code above has an explanation for each line. Please read the notes in the code!

Video Tutorial

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