July 2, 2014
Long career in software and hardware. Hacking for 50 years.
News - Enginursday: Divisibility
about 3 days ago
About Octal … Octal was popular in instruction sets that were based on groups of 3. This was useful when symbolic debuggers were not available, screens were small, printers were slow. Using a PDP-11 Reference card (which was necessary for the same reasons) - here are examples. It had eight registers, so that was a single octal digit in an instruction. There were eight “modes” such as auto increment, “Deferred”, use as an address, index (use with a constant added to the register). “Deferred” was an odd value, not deferred was even. So the Clear or Clr instruction was 00 50 MR, in octal defining the mode or use of the register, then the register. Mov was 01 SS DD with the mode and register defined in the respective octal digits. For “banging two stones together” - it was very convenient and an experienced assembly language programmer could read an octal dump as easily as a not commented page of code. There were even certain “gambits” of coding which could be recognized, so one could figure things out just by using bit switches on the front panel and cycling through the memory one word at a time.
News - FCC To Reclassify Interne…
about 3 weeks ago
Some people are slaves of ignorance. I don’t think you really realize much.
Youthful glee? How do you figure that? If you can’t see the good in it, it’s not clear that you know what “It” is. Your remarks about “owning it” are completely skewed from what this is about. So ‘A very bad thing" is based on what comprehension? Nothing in your remark demonstrates understanding of this.
Rather than absurd “Youthful glee” - I see cynicism from you, but based on what knowledge of this change? I’ll speculate that you have some idea that all regulation is bad but I also think you think regulating (or limiting) corporations is not regulating people. Done right (and this is), it gives people and small business more freedom and not less. You don’t appear to understand that.
No it isn’t. I suggest that you really read about this. You clearly have not. This is about OUR FREEDOMS. Freedom for corporations is not freedom for people. Try to keep that straight.
about 3 months ago
XBee is in essence a radio modem with other features. Send data in, it comes out at the other radio. At high data rates, you may need to use the hand shaking features as well but no less than for any modem.
You can use the XBee themselves for that purpose and you can use the XBee USB to talk to another XBee that is connected to that UART port. Keep in mind that these run on 3.3v, not 5v. Also the XBee has API mode in which most of its pins are data or analog IO, not dissimilar in its own right from microprocessors. If you follow links, you will find links to data sheets for the XBee Radios, headers into which they can be connected. Also different radios with a range of power / range capability.
News - Science Time with Shawn: …
about 4 months ago
How many turns to the coil? I pretty much guessed at the rectifier/capacitor. I was somewhat surprised at how short the coil is. However those shake flash lights that charge a DLC capacitor would be a hint that your demonstration would work. Perhaps a similar project would be to make a shake light - or a “shake-duino” … hmmm …. thinking now.
I can speculate on the correct dimensions, number of windings and circuits for these experiments but schematics and build instructions would be really great.
about 5 months ago
Check the price for an analog synthesizer with the distinctive sound which comes from their patented “ladder filter circuit”. If you don’t want that, fine but if you do this is an epic bargain. The same capability in the “mini-moog” was about 1500.00 back in the 1970’s. If you just want to play with generic analog synth, fine. there are cheaper ones, but not much cheaper if you total up all the features here. I can tell you, having worked in this industry, circuits that are stable in different conditions that performers work in are not easy. Even a shift of a hertz or two will irritate a professional musician.
about 7 months ago
These are RGB products while most neopixels are GRB. If set to GRB while using neopixels, this
strip.setPixelColor(pixelNumber, 0, 255, 0); will produce Green on a NeoPixel and Red on these through hole products. This can be readily worked around if you happen to be using this with neopixels as well but it will potentially complicate your code. Why would anyone mix up these products? You have to ask my shrink. :-)
The Data out pin on these devices drives neopixels well. I am not sure why not but the data out from neopixels will not drive this during my experiments so far. I’m not sure why.
The long pin is ground. Don’t reverse 5v and ground, not surprisingly these will not work properly after that. You can reverse conventional LED’s, not these.
I also noticed the power on blue effect someone else mentioned.
about 8 months ago
2pf is within the tolerance of the parts anyway. A 20pf could easily be a 22pf in fact. If this were a recipe it would call for a “smidgen of capacitance”. Either way would work.
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