Arduino - Keypad - LCD
|1||×||Arduino UNO or Genuino UNO|
|1||×||USB 2.0 cable type A/B|
|1||×||Keypad 4x4 (optional)|
About Keypad and LCD
If you do not know about keypad and LCD (pinout, how it works, how to program ...), learn about them in the following tutorials:
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- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
- On Arduino IDE, Go to Tools Manage Libraries
- Search “keypad”, then find the keypad library by Mark Stanley, Alexander Brevig
- Click Install button to install keypad library.
- Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
- Click Install button to install LiquidCrystal_I2C library.
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Press some keys on keypad
- See the result in LCD
If LCD displays nothing, see Troubleshooting on LCD I2C
Read the line-by-line explanation in comment lines of source code!
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