Controlling access with a matrix keyboard

In this section, we will look at how to control the access with a code using a matrix keyboard. In the following image, we can see the keyboard that we will use:

The keypad

In the following diagram, we see the hardware connections to the Arduino board. They are connected to the digital pins:

Connecting an LCD screen to display the code

In the following diagram, we show the hardware connections of the LCD screen to the Arduino board:

We have looked at some interesting projects that you can develop by adding new sensor to control other devices. In the next section, we will look at a very interesting project. Get ready for the next step, this is a great goal.