Devices: PCB, OpenCV/RasPi and NVIDIA Jetson Nano
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A beginner tries PCB assembly
I wrote last year about my experience with making my first PCB using JLCPCB. I’ve now got 5 of the boards in production around my house, and another couple assembled on my desk for testing. I also did a much simpler board to mount a GPS module on my MapleBoard - basically just with a suitable DIP connector and mount point for the GPS module. At that point I ended up having to pay for shipping; not being in a hurry I went for the cheapest option which mean the total process took 2 weeks from order until it arrived. Still not bad for under $8!
Just before Christmas I discovered that JLCPCB had expanded their SMT assembly option to beyond the Chinese market, and were offering coupons off (but even without that had much, much lower assembly/setup fees than anywhere else I’d seen). Despite being part of LCSC the parts library can be a bit limited (partly it seems there’s nothing complex to assemble such as connectors), with a set of “basic” components without setup fee and then “extended” options which have a $3 setup fee (because they’re not permanently loaded, AIUI).
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Digitizing a analog water meter
Sadly, my meter is really dirt under the glass and i couldn’t manage to clean it. This will cause problems down the road.
The initial idea was easy, add a webcam on top of the meter and read the number on the upper half it. But I soon realized that the project won’t be that simple. The number shows only the use of 1m^3 (1000 liters), this means that I would have a change only every couple of days, which is useless and boring. So, I had to read the analog gauges, which show the fraction in 0.0001, 0.001, 0.01 and 0.1 m^3. This discovery blocked me, and I was like “this is way to complicated”.
I have no idea how I found or what reminded me of OpenCV, but that was the solution. OpenCV is an awesome tool for computer vision, it has many features like Facial recognition, Gesture recognition … and also shape recognition. What’s a analog gauge? It’s just a circle with an triangular arrow indicating the value.
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NVIDIA Jetson Nano Developer Kit-B01 Gets an Extra Camera Connector
Launched in March 2019, NVIDIA Jetson Nano developer kit offered an AI development platform for an affordable $99.
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