Show us the sketch that worked and the sketch that doesn’t (if different). Lcd.Virtual Serial ports emulator 0.938.4.846 The keypad that i am using in this project looks like this below to the key map also represents the same.įurther below we have mentioned to which pins the Keypad is connected using the variable array rowPins and colPins.īyte rowPins = The variable ROWS and COLS will tell how many rows and columns our keypad has and the keymap shows the order in which the keys are present on the keyboard. Once done we are all set for programming.Įven though we have used a library for using a keypad we have to mention few details (shown below) about the keypad to the Arduino. ZIP file and point the location to this downloaded file. You will get a ZIP file, then add this lib to Arduino by Sketch -> Include Library -> Add. For Keypad library click on the link to download it from Github. The library for LCD is already included in your Arduino by default so we need not worry about it. So let’s add them to our Arduino IDE first. The code is split into small meaningful chunks and explained below.Īs told earlier we are going to interface a LCD and keypad with Arduino using libraries. The complete Arduino program for this project is given at the end of this project. Once your connections are done your hardware will look something like this below Some Arduino boards might show an error while uploading program if there are anything connected to pin 0 and pin1, so if you experience any just remove the keypad while uploading the program. You can use the following connection table to verify your connection with Arduino, you can also check 4x4 Keypad interfacing with Arduino.Ĭonnected to Vss,Vee and RW pin of LCD (pin 1,3 and 5) The Keyboard will have 8 output pins which have to be connected from pin 0 to pin 7 as shown above. We are operating the LCD in 4-bit mode with Arduino so only the last four data bits of the LCD is connected to Arduino. The Arduino itself can be powered from your laptop or through the DC jack using a 12V adapter or 9V battery. The +5V and ground connection shown in the circuit diagram can be obtained from the 5V and ground pin of the Arduino. The complete circuit diagram of this Arduino Calculator Project is given above.

Arduino uno simulator