By writing a python script that waits for a specific keypress, I was able to detect a command sent by the Harry Potter universal wand remote each time it was processed by the Flirc USB receiver. Luckily, The Nobel Company already makes a Harry Potter universal wand remote, and the Flirc USB receiver gives you the ability to associate any IR remote command with a keypress. At the same time, I knew that I didn't want to build something like that myself. I knew that I needed something encoded that could not be falsely associated with random light sources in the classroom. There's lots of various moving pieces that can reflect light or that might be light sources themselves, and you can't easily dim a classroom enough to get rid of potential sources that the computer vision algorithms will try to track. Classrooms are unpredictable places, to say the least. I started by recreating the Raspberry Potter project, but, as I've already noted, I had trouble getting rid of false detects. My ultimate goal was to build a magic, wand-controlled treasure box that my sister could use as a prop in her first-grade classroom (both my sister and my mom are teachers, and they're the real magic). But the computer vision techniques all allow for some level of false detects, and I needed something more predictable. These projects do work, and the flexibility that computer vision based approaches enables really is magical. The majority of programmable wand-triggered projects work by reflecting an IR light source off the tip of a wand, detecting the reflected light using the Raspberry Pi NoIR camera, and tracking that light using different computer vision algorithms. The most famous of these is the Rasberry Potter project produced by Sean O'Brien (). I arrived at this solution after attempting to modify various wand-controlled devices that other people posted instructions for on Instructables, Hackster, and elsewhere. It requires a Raspberry Pi as the controller and a Flirc USB IR receiver in combination with the universal remote wand to control functions in the script. #Flirc usb raspberry pi how toObviously 100% constant extended use isn't likely but it'd be nice to have a case which can comfortably manage that! I'm just not sure if one exists.This instructable outlines how to make a simple Python script that is controlled by the Harry Potter universal remote control wand made by The Noble Collection. I've not been able to test myself but seeing some benchmarks online I'd seen extended 100% cpu stress tests (when overclocked to 2.0ghz) see the Flirc case to throttle eventually which suggests the level of heat dissipation isn't enough to level out below 80c. I cannot try for myself as I have neither Flirc case, nor desire to overclock my Pi4b as its already more powerful than my requirements. Reports suggest the Flirc case with no fans can already achieve this. Then if the case had 2 low powered fans on the top running quiet.ĭoes such a case exist yet? I feel like this design would easily run at 100% in 2.0ghz for extended periods without any throttling. This would allow a thermal pad to be placed on each of the heatsink pillars for optimal heat transfer to the case itself. I'd love to see an all metal enclosure, like the Flirc case, with 3 heatsink pillars which is screwed fairly tight to the board. At the highest, it runs in the high 50s but normally in the 40s. Nicely made: The instructions are very clear: The fan can be run at 3volt and is almost silent. I consider this the best of the three cases. As this is tucked away behind my desk, aesthetics are not important and goes to show how additional thermal capacity, albeit crude, can help.ģ. I added ALDI hardware corner brackets ("ALDI Angle Set 4 piece" 2.99GBP) top and bottom, which although primitive and steel, brought the temp down into the high 40s, low 50s. I concluded that the case had insufficient thermal capacity (for my liking). My Pi ran up to 68deg and the case felt uncomfortably hot to the touch. It now runs below 60degC, but is a bit noisy and the fan isn't secured. It ran hot so I placed a small fan inside the case, using the existing ventilation holes. The official RPi4 case with a finned heat sink. #Flirc usb raspberry pi trialResults of my non-scientific trial is as follows:ġ. I know that the 'experts' say don't worry, but as an Electronic Engineer, I am uncomfortable running CPUs continuously at some of the temperatures recorded in these threads. I'm most impressed with the Pi4, as a desktop replacement but am concerned over the heat issue. A most useful thread, thank you all, along with the mass of information at
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