How to display your Raspberry Pi’s desktop on a Mac

I typically connect to my Raspberry Pis via SSH from my main machine, a Mac. This is fine for pretty much all of the tasks I perform on the Pis, but it only provides access to the commmand line. That’s not a problem for me, but I nonetheless wondered whether I might be able to access the Pi’s desktop UI remotely too.

Pi screen sharing

My Pi Zero’s desktop within my Mac desktop

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Make a Mac ‘Task Done’ NeoPixel Notification Light

I regularly back-up my Raspberry Pi storage card because it’s so easy to damage the card with an improper shutdown or some such. I back up to a Mac, and you can read how I do it here. This wasn’t much of a chore in the early days when I was working with 4GB cards, but now I use 16GB Micro SDs and I know of folks who have much, much larger storage capacities thanks to never-cheaper cards. All this means the back-up takes a long time. So I wondered if I could create a gadget to tell me the task was done, allowing me to get on with other jobs in the meantime.

NeoPixel/FT232H Notifier

At-a-glance notification when your Pi back-up is done, anyone?

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Practise what you preach

Some months back, I posted a guide to backing up a Raspberry Pi SD card using a Mac. I tested it at the time and it worked. It’ll be good to share this, I thought. So I did.

And a good job too, because this past weekend I needed to cook to my own recipe. A long overdue Pi sudo apt-get upgrade followed by tweaking raspi-config zapped my system software.

Pibow Raspberry Pi case

SD woes

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How to build your own Apple iBeacon… with a Raspberry Pi

US department store Macy’s recently said it is implementing iPhone-based tracking tech the better to encourage browsing punters to buy. Of course, Macy has chosen to pitch this as an Apple technology – figuring, presumably, iPhone owners are more receptive to inducements delivered through technology and have more cash to splash than Android fans.

But the fact is, the system Apple calls iBeacon simply makes use of features already part of the Bluetooth Low Energy (LE) spec.

This got me thinking: how difficult would it be to build a similar system of my own? Not very hard at all, it turns out. Choose the right kit and it can be quite cheap too. I created my beacon using a £30 Raspberry Pi and a £12 Bluetooth 4.0 USB dongle.

A Pi's UART pins, connected

Can this operate as an Apple iBeacon? Yes it can

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Raspberry Pi Thermal Printing: an update

Reader Daniel Boira recently asked me if I’d experimented with printing large characters on the SparkFun thermal printer (see Hacking a Thermal Till Printer…) that I’d rigged up to my Raspberry Pi’s GPIO. I hadn’t done so, so I thought I’d give it a try.

Printing double-size text

Print characters tall, wide, or tall and wide

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Hacking a thermal till printer to work with the Raspberry Pi

I’ve always had a soft spot for Sinclair’s ZX Printer. Yes it was slow and the print was poorly rendered on its special aluminium-coated paper, which picked up greasy fingerprints like they were going out of fashion, but it was cute, compact and cheap.

The Sinclair ZX Printer

A Sinclair ZX81 and the ZX Printer
Source: Carlos Pérez Ruiz

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