Identifying a thermocouple

Next up in the riveting Thermocouple series is how to identify an unknown thermocouple as a Type K. There are loads of videos on Youtube on this, but I didn’t find them completely conclusive. Many of them advise “checking the colours of the leads”. Surprise! There are at least six different standards for colour codingContinue reading “Identifying a thermocouple”

The Perils of cheap Ebay stuff, or, why doesn’t my MAX31855 thermocouple board work?

I’ve been playing around with Type K thermocouples for a project. These are cheap, commonly available, and can read a temperature range from –270C to 1260C (though it depends on the exact thermocouple). It looks similar to this (you stick the metal pointy end in the hot thing): The above is a Type K thermocouple,Continue reading “The Perils of cheap Ebay stuff, or, why doesn’t my MAX31855 thermocouple board work?”

What’s eating my Cotyledon Orbiculata?

It’s not been looking well for a while, poor thing….. Then I spotted the underside of the leaves were covered in little black things…. to the microscope! Aphids! Bastards! Well, getting rid of them is relatively easy: blasting it in the shower removes them. I could try some isopropyl alcohol, but I’m worried it’ll harmContinue reading “What’s eating my Cotyledon Orbiculata?”

Moles, Avogadro’s Number, and Atomic Mass Units

I quite enjoyed Chemistry in Secondary School: I think I even did a CSYS course in it. However, I remember always having problems with the concept of a Mole and the calculations surrounding it. I’m not sure if I was being particularly dim, or just didn’t have enough context be able to relate to itContinue reading “Moles, Avogadro’s Number, and Atomic Mass Units”

Return to the joggler

Now that Intel have a slightly less crap driver for the Poulsbo/GMA500 chipset, with the more recent EMGD driver, I’ve converted one of my O2 Jogglers to be a touchscreen media player in the kitchen. I’m using Arch Linux, and I’ve just released some AUR packages to support it. If you install: joggler-xorg-conf linux-joggler It’ll have aContinue reading “Return to the joggler”