The Blog of Ian Mercer.

My first programme [sic]

At the risk of looking seriously old, here's something found on a paper tape bearing the title "Ian's First Programme" ...

BEGIN INTEGER A,B,C,D,E,F,G,ANS
READ A,B,C,D,E,F,G
ANS:=(A+B+C+D+E+F+G)/7 
PRINT ANS
END

Can you identify the language and the computer it ran on?

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Time Series Data Compression

This new technique to compress the time series data collected by my home automation system seems to be working really well.

Ian Mercer
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Digital Twins are never identical

Digital Twin are an online representation of a real world object, a copy of its properties in the digital world and a way to send updated and commands to it. In effect I've been making them for years but now they have a trendy name.

Ian Mercer
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Why smarthomes are hard

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Ian Mercer
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Collinearity test for sensor data compression

One way to reduce the volume of sensor data is to remove redundant points. In a system with timestamped data recorded on an irregular interval we can achieve this by removing co-linear points.

Ian Mercer
Ian Mercer
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Logistic function - convert values to probabilities

Another super useful function for handling sensor data and converting to probabilities is the logistic function 1/(1+e^-x). Using this you can easily map values onto a 0.0-1.0 probability range.

Ian Mercer
Ian Mercer
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ATAN curve for probabilities

In a home automation system we often want to convert a measurement into a probability. The ATAN curve is one of my favorite curves for this as it's easy to map overything onto a 0.0-1.0 range.

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Home Construction Advice

Several years ago we did a major remodel. I did all of the finish electrical myself and supervised all of the rough-in electrical. I also put in all of the electrical system and water in our barn. I have opinions ...

Ian Mercer
Ian Mercer
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T-Mobile home internet

I'm testing a T-Mobile Home Internet device as a backup to XFinity and a way to offload half our monthly traffic to avoid the XFinity 1.2TB cap

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Ian Mercer
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My love/hate relationship with Stackoverflow

Stackoverflow is a terrific source of information but can also be infuriating.

Ian Mercer
Ian Mercer
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Home Automation Systems as a Graph

Using nodes and links to represent a home and all the devices in it

Ian Mercer
Ian Mercer
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Xamarin Forms Application For Home Automation

Building a Xamarin Forms application to control my home automation system

Ian Mercer
Ian Mercer
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Showing home status with just a single RGB LED

Multicolored LEDs can convey a lot of information in a small space

Ian Mercer
Ian Mercer
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A wireless sensor network using Moteino boards

The diminutive Arduino boards include a powerful transmitter/receiver

Ian Mercer
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JSON Patch - a C# implementation

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Websites should stop using passwords for login!

A slightly radical idea to eliminate passwords from many of the websites you use just occasionally

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Ian Mercer
Ian Mercer
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A Quantified House - My Talk to the Seattle Quantified Self Meetup

My talk to the Seattle Quantified Self meetup

Ian Mercer
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Updated Release of the Abodit State Machine

A hierarchical state machine for .NET

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Before there was the web there was BeebTel

Just thought I should mention that I built a web-like system before the web existed

Ian Mercer
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The Internet of Dogs

Connecting our dog into the home automation

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A simple state machine in C#

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Web site crawler and link checker (free)

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Smart home energy savings - update for 2010

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MongoDB Map-Reduce - Hints and Tips

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Why don't you trust your build system?

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Elliott 803 - An Early Computer

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Continuous Integration -> Continuous Deployment

What is "quality" in terms of a released software product or website?

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Making a bootable Windows 7 USB Memory Stick

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Ian Mercer
Ian Mercer

Tip: getting the index in a foreeach statement

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Ian Mercer

SQL Server - error: 18456, severity: 14, state: 38 - Incorrect Login

A rant about developers using the same message for different errors

Ian Mercer
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WCF and the SYSTEM account

Namespace reservations and http.sys, my, oh my!

Ian Mercer
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Mixed mode assembly errors after upgrade to .NET 4 Beta 2

Fixing this error was fairly simple

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Shortened URLs should be treated like a Codec ...

Expanding URLs would help users decide whether or not to click a link

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Ian Mercer

Tagging File Systems

Isn't it time we stopped knowing which drive our file is on?

Ian Mercer
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A great site for developing and testing regular expressions

Just a link to a site I found useful

Ian Mercer
Ian Mercer

Introducing Jigsaw menus

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Ian Mercer
Ian Mercer

Fix for IE's overflow:hidden problem

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A better Tail program for Windows

A comparison of tail programs for Windows

Ian Mercer
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Ian Mercer
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Ian Mercer
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Javascript error reporting

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Ian Mercer
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AntiVirus Software is the Worst Software!

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Ian Mercer
Ian Mercer

ASP.NET Custom Validation

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Some advice on software optimization

Ian Mercer
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Second Drobo Update

At this point things were looking up for my Drobo

Ian Mercer
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Ian Mercer
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Google Chart API

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Monitoring a cable modem using its HTML management interface

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Cache optimized scanning of pairwise combinations of values

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Ian Mercer
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Threading and User Interfaces

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Core duo desktop machine runs cool

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Take out the trash!

Why Windows shutdown takes so long

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New Home Automation Server

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Dell upgrades - a pricey way to go

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Preparing for death

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