Member Since: October 17, 2012

Country: United States

  • For reinforcing concrete in these small items, would something like sisal fibers like in plaster mold forming? (Flexible sisal might be easier to manage than metal mesh. And if RF devices are embedded any metal reinforcement might adversely affect the signal.)

    I wonder how well pieces of window screen (either old-school metal or modern fiber) would work for reinforcing. Easily cutable into shape that allows for keeping a gap between the reinforcing edge and the outside surface for aesthetic reasons.

  • The fritzing diagram was accidentally left out.

  • Actually, to fully matrix all the switches he would need 9 pins (the encoder switches would be either on an additional row or column). He could also have used the voltage divider trick for those two switches. There are enough extra analog input pins available on the pro-micro for this. See this pin-out image.

    But, yeah. With lots of matrix keyboard examples out there, this is a good example of another way to skin this particular cat.

  • I just had an interesting thought. I don’t have an ABS printed part on hand to try this out. How about clear nail polish as a sealing/smoothing coating? It is acetone based so should chemically bond to the ABS. Even if it doesn’t remove the appearance of layers, it should fill the valleys (particularly if applied in several coats, maybe some sanding between coats like building up varnish layers on wood) between the layers to provide a smooth surface for the stickers. And then a couple coats on top to seal the label inside the nail polish.

    If it works, all the credit I require is “some dude on the internet hypothesized about this…” (i.e. be humble and don’t take credit for ideas that aren’t your own, but I doubt this is a unique idea so I don’t need personal credit.)

  • Looking at the TinyTILE board, I notice that the USB connector doesn’t look like the generic USB-Micro connectors that are very common. (Though, I do note that the shield is actually THT, hopefully adding strength to the connector-to-board physical connection. Yay!) That covering over the shield, is that just a plastic covering, or is it actually an integrated Ferrite choke?

  • I surprised SparkFun isn’t carrying the 4-position clincher connectors. It seems to me that the 4-position clincher connectors would be a natural companion to their Qwiic system of connectors, especially with the Qwiic Adapter board.

  • There really isn’t much space in the bracelet. An inline resistor on the LED chain would be much more compact. One could (try to) argue that the dimming of the LEDs as the battery starts to run dry is a “feature” telling the user to charge the bracelet. ;-)

  • Right. See the tip detail picture on the product page. (xtopher also linked directly to the picture, above.)

  • There is no need to teach people obtuse punctuation like “&&” and “||” when C++ (and, by extension, Arduino) has perfectly reasonable “and”, “or”, and “not” keywords. You can — and, I think, especially in beginner tutorials, should — just write “P and Q” instead of “P && Q”, perhaps with a sidenote telling people that, for historical reasons, && is a common synonym for it.

    I hadn’t realized that there are keywords for “and”, “or”, and “not” in C++. I’m just so used to using symbols for each. When I approach a new language I search for symbols instead of keywords for simple operators so I never looked for the keywords when introduced to C++ in the guise of Arduino. (I had so far avoided anything more C-like than Pascal up to then.)

    Also, most demo and publicly shared Arduino code uses the symbols instead of the keywords. So, while keywords can be easier for the novice to immediately read and learn from, they will be totally unprepared for the rest of the world.

    I would disagree (mostly for semantic reasons) with you calling “&&” as synonym for “and”. I think it should be better described as the symbol for “and”. On the similar reasoning that “+” is the symbol for “plus” (within an algebraic context).

  • I have an earlier model of the Portasol (red with the strike wheel in the cap). It actually came in handy while backpacking. I would use the hot knife to cut and melt the ends of nylon rope, and the blow-torch tip to help others light their shaker stoves. I tried using the blowtorch to help light the fire, but the hot spot was too small and concentrated to do anything more than incinerate just the part of the tinder that I pointed it at. YMMV though.