Category Archives: Python

Raspberry Pi LESSON 38: Motion Detection Alarm with Multiple Alarms

In this video lesson we show how to create an Alarm System based on a Raspberry Pi, with user input from a keypad, and user prompts on an I2C LCD Display. From the earlier lessons in this series, you must install the LCD1602 Library, and you must install the keypad library. We include the code that we develop in this lesson below for your convenience:


Library for Reading a 16 Button Keypad on the Raspberry Pi

In this lesson we show you how to create a Python Class and Library that allows you to easily get user input on a Raspberry Pi from a 16 button keypad. This will allow very easy interaction with the keypad.

The Library Code which we develop in the video is presented below for your convenience:

To use this code as a library, save it in the same folder as your python programs, and save it as


This is a simple demo program that calls the library above, to receive input from the keypad.


Library for I2C Connection of the LCD1602 to the Raspberry PI

This lesson shows how to connect an LCD1602 to a Raspberry Pi using only 4 wires by I2C. You will need to copy the code below, and create a program called, and save it in the same folder your main python programs are in.


Using an Arduino with Python LESSON 11: Controlling an LED from Python

In this video lesson, we show how to control an LED using python. Python sends commands to arduino, which then controls the LED. We also create a vPython visual, where the ‘Virtual’ LED mimics the behavior of the real LED. This a really cool demonstration and hope you enjoy it. I include below the code we develop in the video. On the arduino side we end up with the following:

And on the python side we have: