Enclosures for electronics and RF

Investigations into using ABS, polycarbonate and sheet metal enclosures to house electronics with a focus on getting that radio signal (wifi, 3G/4G) out of the box Requirements Weatherproof. IP66 = no dust and no water even from jets. IP55 would be okay […]

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 […]

Insulating a Queenslander

Stud Walls Often you can’t access the wall without removing weatherboard or plaster. However, the stud bays in my house are open – no noggings, few wires. Therefore I’ll try to pump in insulation via (1) top (2) bottom or (3) a […]

Daylight Analysis

Level 1 (Ground) We want good daylight – a “daylight factor” (DF) if used with a uniform sky. <2% is dim (dark blue) 2% to 5% is good More than 10% is pretty bright, but okay for outside areas No windows Standard […]

Solar Analysis

In Brisbane we want zero sun in Summer, a tiny tiny bit in Spring and Autumn and a reasonable amount in Winter. Analysis is straightforward and shows: Shading Take 1 : Base Analysis: L2 east facade needs strong external shading. Operable shades […]

Hacking an IotaWatt ESP8266

I need to flash the IotaWatt firmware (and write new files to the SD card) for two reasons: firstly I have a bricked IotaWatt, and secondly I want to try to modify the firmware to sample at 1 seconds intervals. Resources https://community.iotawatt.com […]

Access Grafana v6 without a login screen

Unlike Grafana 5, we can’t use the ‘old’ method of a proxy login to get a cookie for semi-permanent login. This post investigates options to achieve the goal of: Provide a user a “secret” URL which allows them to login to grafana […]

IotaWatt: Multi-Tenant Setup using InfluxDB

This post describes how to setup IotaWatt on a single-database (multi-tenant) arrangement in Influx. Previously I described single database setup for Influx, Grafana and IotaWatt. Much of that information is relevant, but changes are noted here. Setup database (once) It’s better practice […]

Architectural Hacking

Layout Moves Sometimes it’s hard to predict which layout will look best – often the plan (i.e “in plan”, looking down) is doesn’t tell the story of standing in the room. Using a 3D package and exporting similiar view is helpful. Hover […]

Daylight and Sun Shading Analysis – Superceded Pod Design

Shading and Daylighting Using Ecotect and some custom scripts, it’s possible to quickly generate “views from the sun”. Using Radiance, we can calculate the amount of natural light we’ll get from the windows, and which are will be dark. Some examples are […]