![]() A DC motor will give us a good amount of torque without spending a significant amount of money. A stepper motor may be useful, however DC motors are simpler to operate and therefore will reduce the complexity of the system and hopefully increase it’s longevity. In this case, a simple geared 12 V DC motor should suffice. Therefore, do not need a motor which allows for precise positional movement as we can use a sensor to determine an accurate final limit position. We don’t need accurate intermediate positions of our window, only that we can accurately determine when the window is fully closed. The other consideration is positional accuracy. If we want to connect the motor directly to the crank shaft, we will likely need some significant torque. ![]() The crank shaft requires a noticeable amount of torque to close the window, particularly to close the window from 90% to 100%. ![]() Let’s consider the components fo the system:Ī motor: The primary consideration in this case is the torque required. It also needs to be easily removable so that the regular crank arm can be reinstalled if ever we need to - I won’t live in my condo forever! It should also be covered in such a way that it is appealing to look at. Replacing my windows is not an option, so the system needs to connect to the existing window crank mechanism to open and close my window. Check out the sequel to this post here, where I create the logic which automates both my windows and thermostat. This post will discuss how I created the actuator system and connected it to Home Assistant. Manually making these adjustments was a lot of work! This inspired me to create an actuator system which would open and close my windows, and use Home Assistant to automatically control both my windows and AC to minimize the cooling from my AC by using my windows as much as possible. To minimize my energy consumption, I was constantly thinking about when to turn on and off my AC and open/close my windows. Eventually, I installed AC since no matter how well I operated my windows some days were simply too hot. Similarly, as the day went on, I would need to consider the best time to close my windows so that I did not end up letting warmer air inside. ![]() I found myself either leaving windows open during the night, or waking in the early hours of the day to let in the cool morning air. ![]() When I first moved into my house, there was no AC. ![]()
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