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  1. This is likely the problem. 2.1A is not enough to...

    This is likely the problem. 2.1A is not enough to drive 400+ LEDs. 50 LEDs at full brightness white can draw as much as 2A, depending on the LEDs used.
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    We used DokuWiki internally within my work group...

    We used DokuWiki internally within my work group for about 5 years. We have not used it for a couple of years now, due to various internal corporate changes. I also hosted a MediaWiki site for an Eve...
  3. Well that's another piece I won't have to design...

    Well that's another piece I won't have to design and build. :D
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    Thanks for the "Cyber Monday" sale. I got tied up...

    Thanks for the "Cyber Monday" sale. I got tied up all day Friday forgot to order before going to bed oh so very late. :)
  5. Lots of good discussion, but i figured I would...

    Lots of good discussion, but i figured I would add my current audio desires to the list.

    My use is to add sound to Sci-Fi props, such as blaster pistols and light sabers. So I need the small size...
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    I would say that would be a great idea. Many...

    I would say that would be a great idea. Many people just don't realize what real world conditions can do to your project that worked perfectly on your desk/workbench. Knowing anything about...
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    As Paul said the problems will not be fixed...

    As Paul said the problems will not be fixed without some hardware changes. The environment this is being used in is "electrically noisy"(EMI, static, etc.).

    Given this better description of the...
  8. I am using Teensy because of the big feature...

    I am using Teensy because of the big feature list, in a small size, at a good price. For my current project I need at least 7 PWM outputs, the ability to run off a single 3.7V Li-Po battery and it...
  9. IIRC serial.read returns a byte, not a char. So...

    IIRC serial.read returns a byte, not a char. So change the type of cmd to byte and try changing the print line to the following to cast the ASCII byte back to a character.

    Serial.print((char)cmd);
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    If you are running for only 3 hours you should be...

    If you are running for only 3 hours you should be able to power things without a problem. A set of plain old generic AA batteries fresh from the package should provide 400mAh or more. So even if your...
  11. The diode would be in series between the power...

    The diode would be in series between the power supply and the relay coil. The reasoning for this is to prevent reverse flow of current when you turn the relay off.

    When energized that coil has...
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    Off the top of my head I think the SD card spec...

    Off the top of my head I think the SD card spec says it should be 0.5mA in standby and 45mA max during 50MHz read or write. At 25MHz current draw is about half that. I have heard real world numbers...
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    For rule of thumb you can take the UART bps,...

    For rule of thumb you can take the UART bps, divide by ten, for start/stop overhead, to get characters per second. Divide one by the result and you get the time per character. Multiple by the UART...
  14. I would suggest some isolation of the power...

    I would suggest some isolation of the power supply to the relay. Minimally a diode, possibly a cap as well. While the coil may not use much current once latched, it can draw a lot more when it is...
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    I wrote software for a system that was located in...

    I wrote software for a system that was located in areas with high EMF and electrical noise back in the early 1990's and this sounds similar to things we would see. The system in question controls...
  16. Thread: T3Bot

    by jsfetzik
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    I had a similar issue many, many years ago. The...

    I had a similar issue many, many years ago. The way we "fixed" it was to plug headers or a socket into the breadboard and then plug the device into them. We actually had to stack a couple sets of...
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