Arduino: figuring out transistors and associated resistors

From www.sqlskills.com 13 years ago in Blogs

My aim while building all these cool circuits is to re-learn all the electronics theory I knew when I got my electronics degree, but have forgotten in the intervening 15 years! The kinds of circuits I'm most interested in right now are those that drive large arrays of LEDs from an...

Articles from Paul’s Electronics

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From www.sqlskills.com 2 years ago in Blogs

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Why switch debouncing is so important…

From www.sqlskills.com 3 years ago in Blogs

Here's a graphic illustration of why mechanical switch debouncing is so important: It's the output of a push-button switch when I press it. The metal contacts inside the switch bounce against each other, creating two pulses when I...

Smoothing capacitors on power lines

From www.sqlskills.com 3 years ago in Blogs

Well, the best laid plans of mice and men, and all that. Now I've got a long-term project to finally get back into electronics and blogging after an almost 10 year gap. I'm building an 8-bit computer on breadboards, based...

Bouncing Ball with a Newhaven Display 160×128 RGB OLED

From www.sqlskills.com 6 years ago in Blogs

Wow - it's been more than 6 years since I had some serious time to play with electronics and blogged here! Life and work just got in the way. But no more! After spending about a week sorting out my...

Kit building: vacuum fluorescent display clock

From www.sqlskills.com 12 years ago in Blogs

I've always been intrigued by vacuum fluorescent displays (VFDs) so I picked up the Ice Tube Clock Kit from AdaFruit Industries that uses a Russian VFD tube. (Click any photo for a 1024x768 image.) Here's what came in the kit:...

More Arduino shields to play with…

From www.sqlskills.com 12 years ago in Blogs

It's been quite a while since I've had bandwidth to sit down and get stuck into electronics again, but now I'm home for almost two months, so I'll be blogging more on here. Over the last few months I've discovered...

Kit building: Four interactive light panels connected together

From www.sqlskills.com 12 years ago in Blogs

Well, summer's over and that means I can justify being indoors playing with (and blogging about) electronics again. Expect this blog to get busy again! Back in March I blogged about building an interactive light panel from Evil Mad Science Laboratories....

Kit building: Evil Mad Science interactive light board

From www.sqlskills.com 12 years ago in Blogs

It's been another few weeks of traveling and client work so I haven't had any chance to tinker. Apologies to those subscribers expecting the frenetic pace of my SQL blog - ain't gonna happen. I'm at home for a few...

Arduino: Windows simulator of driving matrices of 8×8 LED arrays

From www.sqlskills.com 12 years ago in Blogs

It's been a couple of weeks since I've been able to play hands-on with electronics because I've been busy with client work and out-of-town traveling. To continue satisfying my must-be-tinkering-with-something urges, I hit upon the idea of using some old...

Arduino: cascading shift registers to drive 7-segment displays with PC input

From www.sqlskills.com 13 years ago in Blogs

In the last post I figured out how to drive a 74HC595 shift register to control 8 LEDs from only 3 digital outputs of the Arduino. Now I've taken that a step further and cascaded (sometimes called daisy-chained) four 595s...