Category listing for Tutorials

Raspberry Pi 2 - IoT Hello World

In this, the third in the Raspberry Pi series of articles we will be building on previous articles to develop a simple solution for what I would call an Internet of Things Hello World project. In my previous articles we discussed initially setting up the Raspberry Pi and in the second article using Mosquitto as a message broker. In this article we will be introducing several new software, middleware and firmware packages as well as a new hardware device the ESP8266-12e WiFi adapter. If you haven't read my previous articles I suggest you read them before continuing.

Arduino Due - UART

One of the most important functions in embedded electronics is the abitlity to communicate with other processors or integrated circuits and one of the primary ways that the Arduino Due can accomplish this is with the UART/USART Controllers. For those not familiar with this method of communications I recommend the Serial Communication[4] article at

Arduino Due - PWM

In this edition of the continuing series of articles uncovering the mysteries of the Arduino Due we will be tackling the problem of creating a Pulse Width Modulation (PWM) signal. To do this we will use two techniques; first the old fashion way with a timer and secondly with the PWM Controller which is specific to the SAM3X8E processor. If you look at the pinout for the Arduino Due you will see that Pins 2-13 are set aside for PWM with 4 of them using the PWM Controller and the rest use the various timer channels.

Arduino Due - SPI

The Arduino Due has 2 SPI units on board and when configured as Master uses 4 chip select lines to allow selection of up to 16 slaves per SPI unit. The SPI Controller is a sophisticated controller that can be configured in a variety of ways that should solve most serial communications needs.

Raspberry Pi 2 - Initial Setup

You've got your finger on the mouse button ready to pull the trigger and finally order that Raspberry Pi 2 that just came out but you don't know if you've got the time to do the research to learn how to set it up and start programming it. In this first of n part series of articles I will walk you through the process of getting the Pi configured. In future articles we will configure the Pi to program in the C/C++ and Python languages.

Using an Arduino UNO timer to emulate threading

I'm working on an DLSR Pan Tilt project I found on thingiverse. It's a nice project designed for a small DLSR camera with a fairly good range. I plan on mounting a Raspberry Pi with an attached PiCam so I can do some time lapse photography.

Flip jQuery plugin for previewing web content

The Flip jQuery plugin is a light weight extension that allows the user to type raw HTML and CSS in a textarea and have the ability to preview the formatted content in a div area without reloading the page. Use this extension in place of a blotted HTML editor like CKEditor when all you need is a simple light weight control.

Raspberry Pi 2 - The Pi as an IoT Message Broker

In this, the second article in an ongoing series dedicated to the amazing Raspberry Pi we will be configuring the Pi as an MQTT message broker using Mosquitto. Mosquitto is a lightweight, but powerful publish/subscribe model messaging system that can be installed on a wide variety of platforms. Our goal in this tutorial is to install, configure and test the software on a Raspberry Pi 2 and to be able to publish and subscribe to messages on not only the Pi but other computers as well.

Arduino Due - PIO

This is the first in a series of articles that will cover the inner workings of the Arduino Due 32bit board based on the Atmel SAM3X8E ARM Cortex-M3 processor. Each article in this series will cover a discrete sub-system within the micro controller and in this first article we will begin with a discussion of the Parallel I/O controller.

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