(/images/uploads/2010/01/SailingFromFlickr-300x185.jpg "Agile Software Development is like sailing")](/images/uploads/2010/01/SailingFromFlickr.jpg)
Software development is a lot like sailing: unless you are sailing
downwind you can't get there directly and you have to tack; so you pick
a tack and set off. You hold the tack for a 'sprint' and then you go 'go
about' and head in a slightly different direction for another 'sprint'
until you reach your destination. Just like sailing if you change
direction too often you go nowhere (this is why agile insists no changes
in direction during a sprint). Just like sailing, currents and wind can
change during your trip causing you to adjust your tacking (sprints) to
get there. Just like sailing, you can't say exactly when you will arrive
unless you know every single current and wind change that will happen
during the trip.
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.
Why automated learning is hard for a smart home. The perils of over-fitting, under-fitting and how the general unpredictable nature of life makes it hard to build a system that learns your behavior.
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.
Home automation systems need to respond to events in the real world. Sometimes it's an analog value, sometimes it's binary, rarely is it clean and not susceptible to problems. Let's discuss some of the ways to convert these inputs into actions.
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.
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.
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 ...
