Blogs

Arrays? Pointers? What the C?

Arrays and pointers are always a problem for newcommers to C and C++ programmers. Especially if they have come from higher level, more "dumbed down" languages like Java or Basic.

You may think that an array is an array, right? And an array in one language works the same as an array in another language, cus they're, like, arrays, aren't they? Well, you couldn't be more wrong. Certainly when it comes to arrays in C and C++, anyway.

I guess you're probably used to working with arrays like this (pseudocode):

1×10³²⁴ things to do with a chipKIT™ Lenny and a QuickIO. No. 2: Virtual Mouse.

Number two in my series of what to do with a Lenny and a QuickIO.

How about a mouse? Yeah, a mouse. Honest :)

Well, maybe not an actual mouse, but maybe make it control the mouse pointer in an "almost" usable way...?

The two potentiometers on the QuickIO could control the mouse position, and the buttons can be the mouse buttons for clicking, etc. That should work.

1x10³²⁴ things to do with a chipKIT™ Lenny and a QuickIO. No. 1: Autoclicker.

This is the first part of a new series entitled "1x10³²⁴ things to do with a chipKIT™ Lenny and a QuickIO". In it, I'm going to be exploring some of the cool things you could do in just a matter of seconds using the two boards combined.

This first one is an Autoclicker.

Vacuum Fluorescent Displays on Arduino

Vacuum Fluorescent Displays are probably one of the coolest displays of all time. Certainly one of the most popular of recent history. Developed in 1959 by Philips they have endured right through to modern times. You can even still find them in current consumer electronics.

Configuring Yùn WiFi

It's not always obvious how to configure the WiFi on the Arduino Yùn properly, since most of the good settings are hidden away in the "advanced" interface. So I'll do what I can to expose them to you.

First off, when messing with the WiFi, you really want to be connected to the Yùn using an Ethernet cable (you most probably had one provided with your WiFi router when you got it - it's buried at the bottom of a drawer somewhere).

Adding An OLED To My Computer

As part of my work I end up with hundreds of small TFT and OLED displays scattered around doing nothing. One of them, the PG25664CG OLED screen (16 shades of green) I figured would be about the same size and shape as a 5.25" drive bay in a PC.

And guess what? I was right! An absolutely (well, a couple of mm out) perfect match. So I decided I should build one into my computer to display stuff. No idea what stuff yet, but stuff anyway. I'll decide later when I have written the software for it all.

Splitting Up Text in C

A common question I often find is:

How can I split this incoming data into parts?

It's especially asked in conjunction with reading data through serial. So I thought I'd introduce you to two completely different approaches, each with benefits and drawbacks depending on the kind of data you are splitting.

So you have some data coming in through serial, or some similar stream, and you need to cut it up into different parts. The two methods basically consist of either:

What Exactly is a GPIO Pin?

I was hoping to make this the topic of my first ever video tutorial, but I still haven't got round to cleaning my desk of all the junk and setting up a holder for my phone to use as a camera. Plus I am suffering from a bad cold right now and sound awful. So text it is.

I'd like to help you get to know exactly what a digital IO pin of an Arduino actually is and how it works. Many questions I come across along the lines of "How does this work", or "Why do you need to do this", or similar, can be answered easily if you know exactly what goes on inside an IO pin.

Designing a Development Board

So I heard you were thinking about designing your own development board. That's nice. But do you know how?

It's one thing to go "I'd like to build my own development board", but it's quite a long step from there to "I have built my own development board and it works".

There's a number of steps you should go through before you even set pen to paper.

Why build another development board?

Pages