mctom987

Member Since: June 30, 2012

Country: United States

  • Hard solders (high silver, or other blends) can use the 480 setting. Many lead-free solders work better around 400, owing to high silver or copper. For example, the SparkFun "Special Blend" solder is 3%Ag 0.5%Cu, and works great at 400C temps.

    Leaded and pure-tin solders, yeah, you'd only need the lower two. Those metals are soft and easy to work with, and have a low melting point.

  • Shouldn't the high side of the translator be connected to the 5v supply for the LEDs? This would put the logic and VCC at the same voltage, where using the controlling board's 5v is likely to be off by ±100mv when compared to the 5v supply for the LEDs. Put another way, how much does it matter that the clock and data lines are 100mv different from the VCC?

  • Note to self: Learn to RTFM

    2000 pixel max, so 250 of these boards ~ 120 feet. Addressing won't be a problem.

    Multi-tapping is possible, and even recommended (based on COM-14016 datasheet) for long runs.

    5V 70A supply is good for 1200 pixels, so 18 * 8 = 144 pixels. Using a 5V 20A supply should be no problem.

  • Assuming an adequate supply, how many of these could one chain together before addressing or current becomes a problem? Is it possible to multi-tap the 5v to reduce board-board current?

    Looking to run a long line, about 7 feet (maybe 18 of these 8-strips), of these. The 2-wire/Pi compatibility and 5v make this much preferable to commonly available 1-wire 12v LED strips.

  • I still haven't figured it out. Been stuck here for several days now. :/ I feel like I'm missing something obvious. Spoiler free hints appreciated.

  • Ugh… I can't even properly review it without posting spoilers!

    I can say it's fantastic, and I think it's worth getting. I love puzzles, and this is an interesting approach to them. Unfortunately, the card reader it comes with is a little too cheap. I broke the tiny bit of plastic that holds the lanyard, and getting the card out of the reader is also extremely difficult. Luckily, I had another reader that works.

  • So the Model B+ and Model 2 are two-dimensional objects, and the rest are 3-dimensional?

    Also, 1k mA? Seriously? 1A or 1000mA, not 1k mA… preferably 1A.

  • Did someone let the intern play with the shiny hyper-photogenic quarter again?

  • No, it was definitely unclear when I posted it. I edited shortly after, and you probably read it in between the original post and the clarified post. No worries.

  • I know exactly how charlieplexing works. I'm saying I'd rather use 9 pins to do 8x8 than 8 pins to do 8x7

No public wish lists :(