Author Archives: admin

Planes I have flown in (updated again)

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Updated with the Airbus A319.

Planes I have flown in (updated)

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Solved: Initial Arduino Opta setup woes

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I had great difficulty getting my Arduino Opta set up and working using the Arduino PLC IDE – whatever I tried I got the “Cannot download Sketch file (error code: 1)” error.

I finally had success using the plain Arduino IDE to do the initialization and then switching to the Arduino PLC IDE. The final step was changing the Modbus address to 247.

It probably shouldn’t be that tricky….

Recently Read: Erebus by Michael Palin

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It’s been a while since I’ve posted on this blog (and even longer since I’ve completed reading a book) – I really need to do both more often. I really enjoyed this book, despite the relatively gloomy subject matter. I find Michael Palin’s writing style very engaging; once I started reading it was difficult to put down.

While the mid-1800s seems like another time, in reality it wasn’t that long ago. It is incredible to think how far humanity and technology as progressed – ~150 years later and satellite imagery could provide most of the answers this ship and its crew sought from the comfort of a couch.

Updated: Arduino Opta

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I ordered an Arduino Opta (RS485 version) and it has arrived – stay tuned for upcoming posts!

In the meantime, I’ve updated my initial review as it has been confirmed that the digital inputs support 24VDC. Programming support for IEC 61131-3 PLC languages has also been clarified (no MacOS support sadly).

ProsConsUnknowns
Partnership with FinderDigital I/O uses 0-10VDC, not “standard” 24VDCHow will programming support for IEC 61131-3 PLC languages work? Via existing IDE?
DIN rail mountAnalogue inputs use 0-10VDC, not “standard” 4-20mACan programming be done over Ethernet?
IEC 61131-3 PLC language supportI/O expansion options?
(What does the “AUX” port do?)
Digital inputs support 24VDC (see here)
Beefy relay outputs with dedicated commons
Modbus-TCP and Modbus-RTU support
Input power supply is 12-24VDC
IP20
-20 °C to +50 °C temperature operating range

Initial Thoughts: Arduino Opta

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Arduino have announced a new micro PLC, the Opta, and while some details are unclear, it seems like a pretty neat product. Here are my initial thoughts:

ProsConsUnknowns
Partnership with FinderDigital I/O uses 0-10VDC, not “standard” 24VDCHow will programming support for IEC 61131-3 PLC languages work? Via existing IDE?
DIN rail mountAnalogue inputs use 0-10VDC, not “standard” 4-20mACan programming be done over Ethernet?
IEC 61131-3 PLC language supportI/O expansion options?
Beefy relay outputs with dedicated commons
Modbus-TCP and Modbus-RTU support
Input power supply is 12-24VDC
IP20
-20 °C to +50 °C temperature operating range

I’m hoping to buy one.

Apple 27” Thunderbolt Display

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My Apple 27” Thunderbolt Display was flickering on and off intermittently (running on my M1 MacBook Air via a Apple USB C/Thunderbolt Adapter). Turns out it was the integrated Thunderbolt cable – I’ve connected it using a seperate cable and it now works perfectly (the display has a separate Thunderbolt port you can use).

Eventually I may try to replace the cable properly but it’s a fairly involved job… (thanks Apple!).

Dusting off my Apple IIc

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Snow White 🙂

I have a pair of Apple IIc units (with matching power bricks), an Apple IIc monitor (complete with stand), an external Apple IIc floppy drive and an Apple IIc mouse (in original box no less).

In some brief testing, everything apart from one of the Apple IIc units worked perfectly (including both power bricks). This includes all of the 5 1/4 inch floppy disks I tried!

As you can see from the following photographs, the monitor is still crisp and bright. Not bad for around 38 years old!

With any luck, repairing the other Apple IIc unit shouldn’t be too hard. Everything is intact and present and there are no signs of damage.

Turns out my working Apple IIc is an ”original” ROM version.
Mouse IIc
System Utilities Version 1.0 (1984!).
Cool keys (that need more cleaning)

Review: Birders (film) on Netflix

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I stumbled across this film via a Facebook post and watched it during lunch and on the bus home from work (it’s only 37 minutes long). It provides interesting insight into the birding on either side of the US/Mexico border, an area I knew very little about. A bonus is the wonderful cinematography (in particular the incredible raptor scenes). It’s a niche topic but I highly recommend the film.

https://en.wikipedia.org/wiki/Birders_(film)

https://www.netflix.com/au/title/80244682