Category Archives: Computing

Adding support for new devices to emoncms

Posted on December 16, 2021 by james

To be clear: I’m not certain this is the right way to go about this. It’s mostly based on guesswork and assumption from what I’ve scraped together reading around the discussions about emoncms. For the moment it appears to be … Continue reading →

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Setting up emoncms in Docker

Posted on December 15, 2021 by james

As I posted earlier, there’s a github project for setting up emoncms in Docker, but the configuration assumes that a MySQL instance will be set up in a second Docker image and everything built together with docker-compose, which wasn’t what … Continue reading →

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The power monitoring plan is coming together

Posted on December 14, 2021 by james

As I may want to use power consumption data (and other information, such as data from the weather station) in a number of different applications, I’ve come to the conclusion that MQTT may be a way forward, allowing those applications … Continue reading →

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Changing the RFXmeter base address

Posted on December 1, 2021 by james

This morning I overcame the first obstacle on the way to rebuilding my power monitoring system. I have two RFXmeter units sending data to the receiver which is plugged into a Linux machine on which I’m running rfxcom-rx from the … Continue reading →

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Power monitoring revisited

Posted on December 1, 2021 by james

A few years back I used to have a load of power monitoring stuff hooked up to the house electricity supply, but then we had a lot of electrical work done and it had to be removed. I didn’t get … Continue reading →

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Zombie Pi

Posted on December 1, 2021 by james

Good news! It seems my Raspberry Pi isn’t dead after all, though the problem is a little odd. I ordered some new SD cards so I had some spares, and out of interest put a new copy of Raspbian on … Continue reading →

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Model 1 Raspberry Pi bites the dust

Posted on November 29, 2021 by james

My first ever Raspberry Pi has died 🙁 It’s been out with the weather sensors in my Stevenson screen for at least a year, but we had a power outage a short while ago and it wouldn’t reboot. I brought … Continue reading →

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New HP printer admin login failure

Posted on August 19, 2021 by james

I’ve just bought an LP laser printer (a 179 MFP), having got fed up of paying far too much for inkjet ink. The printer arrived yesterday and today I set it up and plugged it in. At one point during … Continue reading →

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OWFS on a Raspberry Pi

Posted on January 29, 2020 by james

I have an old Raspberry in my Stevenson screen and I’d quite like to hook it up to my 1-wire weather sensors rather than running the 1-wire connection into the observatory to my desktop system there. OWFS looks like it … Continue reading →

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Powering a Raspberry Pi from a 12V supply

Posted on January 16, 2020 by james

My Stevenson screen has a 12V supply to it for powering the 1-wire hub that has all my weather sensors attached to it. At the moment the main 1-wire connection runs back to the PC in the observatory warm room, … Continue reading →

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