In this article, we will find out how to interface a matrix keypad with arduino in very easy technique. During this article, we are using a 4*3 matrix keypad. Keypads are a very important component in the embedded system which are used in various mini or major comes and the commercial product like telephone, electronic locker, and alternative automation product. At the end of the article you may be ready to interface a matrix keypad together with your arduino and after you press a key, its shows up into the serial monitor.
What is 4*3 Matrix Keypad
One of the most frequently asked question among the students or hobbyist are when we use 4*3 or 4*4 matrix keypad and what is the difference between them. Therefore, we have only one answer what's your requirement within the project. The logic behind operating of each keypad are same. The 4*3 keypad is simple keypad having 4 rows and 3 column, therefore, total 12 keys as shown in the image. There are so many distributors wherever you will purchase a keypad otherwise you can purchase from here.
Circuit Diagram
The circuit of interfacing of a keypad with arduino is very simple. You only need to connect rows 1, 2, 3, 4 to digital pin 6, 7, 8, 9 respectively and column 1, 2, 3 are connected to digital pin 10, 11, 12 respectively of the arduino. The circuit is extremely easy to grasp as shown in the below image.
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| Circuit Diagram |
Program
Program of interfacing a keypad with arduino is extremely easy. Here we simply use an if-else statement to check every condition one by one. First we kept row 1 low and check all condition for it and equally with others rows one by one. You can download the source code from here.
From here you will display the key on an LCD and build a lot of other cool projects like door lock, calculator, security system enabled projects. Hope you like this article. If you have got any doubt then comment below or have any suggestion then you may be forever welcome to ProjectsDunia.
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