Solar PV, Batteries and … Maths

Some, it all seems pretty simple, right? It’s just import, export, consumption. This post clarifies the sign (+ or -) conventions I use which seem to make things easiest. Each of the three images has a ‘control volume’ where we measure power […]

Zinken Compact 21 : Repairs

I bought this unit in Brisbane, Australia. This records details in case they are useful to others. Bearings Bearings were mostly stuffed after 30 years. They are metric and available from standard suppliers. Steel sides (ZZ). Spindle Molder Belt Idler: 6000 (x2) […]

PiZeroW AP + Wifi Client

So I wanted to be able to set the Wifi details of a Pi without connecting a monitor and keyboard. Easy, right? No. RaspAP almost does it out-of-the-box, but I couldn’t quite crack it. It’s the best solution once it’s working. Insetad […]

Time Travel, unittest.mock, freezegun and monkeypatch

To test time-dependant programs, such as timelapse camera, we can fudge the system time (sleep,. now()) in Python. Some options are: This is easy to use, but doesn’t manage sleep(). Use monkeypatch to override sleep(). Another is unittest.mock (good intro) which […]

Ubuntu 18 on Dell Windows 10

Notes on how to install and tune a HyperV VM running Ubuntu linux, for development. Did this March 2020. Did it on an older 6430u Dell and a brand new Dell laptop. VM HyperV Need Windows Pro and HyperV install. Use “Quick […]

Raspberry Pi Setup (Linux)

Setup SD Card on another linux machine to install headless I use Desktop Raspberry Pi OS distro. This is tested on a Pi Zero and a Pi 4 in Feb 2020. Insert a new SD card (e.g. /dev/sdc/). The check the install […]

Rope for Ski Touring

I wanna go ski touring in the european Alps in 2020 and needed to choose a rope: Half rope okay for crevasse falls and rapping, and maybe for very occasional protection (e.g. a little traverse). Half rope is tested to a few […]

Pi Zero W Timelapse Camera

This scratch pad records my experience with a Pi Zero W unit, capturing outside timelapses. Controlling the PiCamera Reference to python module for control of the Pi Camera (I’m using r1.3). Dev Setup On a headless pi, it’s a pain to view […]

Walking GR5 Via Alpina in May June (2016)

In May and June of 2016 I walked from Menton (near Nice, south-east France) to Mont Paradiso (Italy, nearish Mt Blanc) which is quite high. There are some notes and tips and photos. Details below, or:TLDR> see the photo gallery. Where See […]