Author Archives: davidcrocker

Upgrading the Mini Kossel to Duet Electronics Part 2: Software and Commissioning

In Part 1 of this two-part series, I covered the hardware changes needed to use Duet electronics with the Mini Kossel in place of Arduino/RAMPS electronics. In this second part, I will cover installing the software and the first stages … Continue reading

Posted in 3D printing | Tagged , , | 20 Comments

Upgrading the Mini Kossel to Duet Electronics Part 1: Hardware

The Mini Kossel delta 3D printer is available in kit form from various suppliers, including Think3DPrint3d (T3P3) in the UK. The kits currently supplied by TPT3 include an Arduino Mega and a RAMPS board to control the printer with Marlin firmware. Although this combination … Continue reading

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Ormerod and Mini Kossel 3D printer kits compared

I’ve now built two 3D printers from kits: first an Ormerod both designed and supplied in kit form by RepRapPro, and more recently a Mini Kossel designed by Johann Rocholl and supplied in kit form by Think3dPrint3d. So here is a comparison of … Continue reading

Posted in 3D printing | Tagged , | 6 Comments

Converting the RepRapPro Ormerod to Two Colour

The RepRapPro Ormerod is sold as a single-extruder 3D printer kit. Although RepRapPro is promising to produce a multi-extruder conversion kit for it, they have not yet provided a date when this will be available. So here is my recipe … Continue reading

Posted in 3D printing | Tagged , | 9 Comments

Five Tips for using dc42 Firmware on the RepRapPro Ormerod

Many of you know me better as dc42 on the RepRapPro and Arduino forums. As the owner of an Ormerod 3D printer and an embedded software engineer (amongst other things!), I forked the RepRapFirmware github repository early in 2014 in order … Continue reading

Posted in 3D printing | 4 Comments

Five things I never use in Arduino projects

I’ve been using Arduino for a few months now, and designing electronics and embedded systems for a lot longer. In reading the Arduino forum, I’ve seen a few areas that Arduino users often find difficulty with. It seems to me … Continue reading

Posted in Electronics | Tagged , | 10 Comments

Prototyping small embedded projects with Arduino

Recently I needed to design and build a small battery-operated device with 4 outputs sequenced at a variable rate. After playing with a 555 timer IC and some CMOS flip-flops, I realised that the modern way would be to use … Continue reading

Posted in Electronics | Tagged , | 8 Comments

Alternator failure warning in Piper PA28 aircraft

Some time ago I came across this Air Accident Investigation Branch report concerning a PA32R that landed gear-up following an alternator failure. The report noted: “It was apparent that the ALT caption, which illuminates whenever there is no output from … Continue reading

Posted in Light aircraft avionics | Tagged , , , | 4 Comments

What you probably didn’t know about the Bendix-King KI-525A HSI

The Bendix-King KI-525A HSI and associated KCS-55A compass system was a popular avionics upgrade for light aircraft until the advent of the Sandell electronic HSI and, more recently, glass-cockpit systems from Garmin, Aspen and others. Although it is a mechanical … Continue reading

Posted in Light aircraft avionics | Tagged , , | 39 Comments

Moving mail, calendar and contacts from iPhone to Android

I’ve just switched mobile phones from an iPhone 3G to a Motorola Defy. Of course, I wanted to move my contacts and future calendar entries. Apple doesn’t provide any sort of general export facility for iPhone data, so this required … Continue reading

Posted in Uncategorized | 5 Comments