7/14/2023 0 Comments Weather doppler radar in motion![]() ![]() And if we put it outside of the mirror it’s going to look pretty ugly. I’m also not even sure that it will work through the mirror - the mirror may block any infrared light. If we stick this behind the mirror it’s going to stick out from the wall. The problem I have with the module is that it’s pretty thick. So it’s perfectly safe to connect the output pin straight to the Pi. The only thing that you might be wondering is how we’re going to connect this up to the Pi’s GPIO pins - we’re powering it from a 5V supply and the Pi’s GPIO can only take 3.3V.įortunately, these boards have a cheeky 3.3V regulator built in - so they are actually running at a 3.3V logic level already. You’ll typically be wanting to use Retrigger mode as this behaves in the way that most people would expect. In Normal mode, the output will trigger every second or so when there is motion. Basically, the pin will stay high for as long as something is moving. In retrigger mode, the pin goes high when motion is detected and will go low after the delay from the time the last motion was detected. ![]() This switches the board between Retrigger or Normal mode. The only slightly confusing option is this jumper. There are a couple of potentiometers for tuning the behaviour, one of them adjusts the sensitivity and the other adjusts how long the output pin stays high when motion is detected. The output pin goes high if movement is detected, so that’s also very simple. The power pin can take anything from 4.5 to 12 volts - so that’s easy enough we can just take 5V directly from the Pi. These are readily available and are dead easy to hook up - there are only three pins to worry about. Let’s start with the old classic Passive Infra Red (PIR) motion sensor. ![]() We’ve got a couple of options: Passive Infra Red (PIR) Motion Sensor The obvious solution is to just use a motion sensor. What we really want to do, is to only have the screen turn on if someone is actually in front of the mirror. ![]() We could add a button, we could even try and get clever and add a capacitive touch sensor, maybe in the frame or behind the glass.īut then we’d end up with mucky fingerprints all over the mirror and it kind of defeats the whole point of having a magic mirror in the first place. But a magic mirror with a mouse and keyboard would look pretty silly. Pretty simple when you have a mouse or keyboard. If this was a desktop or a laptop then we’d just have it turn off the screen after a period of inactivity. These USB power monitors are really handy and you can trigger things like Power Delivery and Quick Charge to get different voltages for all sorts of things.Ħ00mA may not sound like a lot, but it all adds up, and have you seen the cost of electricity recently? What can we do? I measured the power consumption and was surprised at just how much power it was using - around 600mA. The problem I have is that it is always on and always drawing maximum power. If you want to watch the video version of this post, you can find it here. There’s nothing wrong with it functionally - it does everything I need. It’s really nice and it’s very handy to be able to get a quick snapshot of things at a glance. If you follow the YouTube channel or the blog you’ll know that I’ve got a magic mirror. #DOPPLER RADAR #ENERGY EFFICIENCY #FACE DETECTION #FACE RECOGNITION #MAGIC MIRROR #MOTION SENSOR #OPENCV #PI CAMERA ![]()
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