![]() ![]() ![]() I’ll explain the working of the 4×4 Matrix Keypad in general without considering any specific microcontroller. The internal circuit of the 4×4 Keypad with all the 16 buttons is shown in the following image. One is the traditional Button type Keypad as shown in the image above while the other is a Membrane type Keypad, which doesn’t contain any buttons but works due to electrical contact between surface of the key and the underlying circuit.Īlso read: How to Build a Simple Arduino Calculator? How Keypads Work?Īs mentioned earlier, a 4×4 Matrix Keypad consists of 16 Keys or Buttons arranged in four rows and four columns. There are two types of matrix keypads available today. The following image shows a typical Button Type 4×4 Matrix Keypad. For example, a 4×4 Keypad consists of 16 keys or buttons that are arranged in 4 Rows and 4 Columns. ![]() A matrix keypad is nothing but a systematic arrangement of buttons in horizontal and vertical fashion. ![]()
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