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morgan_flint

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  • How to Update the Firmware on a Cheap USBasp-Clone

    Interesting instructable!Anyway, depending on the clone, it might not be a good idea to "upgrade" the firmware. According to this thread:https://www.avrfreaks.net/forum/upgrade-usbasp-firmware-arduinoispThe Chinese firmware in the clones might be better than the one in https://www.fischl.de/usbasp/, as it would adjust automatically the speed, so you can ignore the "cannot set sck period. please check for usbasp firmware update" warning

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  • morgan_flint commented on andrei.erdei's instructable Game of Life Coffee Table2 months ago
    Game of Life Coffee Table

    Regarding the problem consumption and the overheating of LEDs, would it be a good idea to substitute the MDF board for an aluminum one? Probably, this would make possible to use the LEDs to their full power, in case someone wanted.Thanks!

    I'm a premium member and I am also having problems with downloads recently. It seems to be an intermittent problem. One day I can't download some of the Instructables I try (but not all) but the following day I can. So keep on trying...

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  • morgan_flint followed BonJiba4 months ago
      • CNC American Flag With User Defined Parameters
      • Build Your Own CNC Milling Machine
  • morgan_flint commented on Stylite's instructable Digital Fireplace1 year ago
    Digital Fireplace

    Very convincing results!Although it would be a bit complicated, another possibility would we to replace the halogen lamp with an RGB LED controlled by the RPI with an Ambilight-like program (https://www.instructables.com/howto/ambilight+raspberry/), so the lamp would mimic the color of the lower part of the video (maybe RGB is not useful/necessary as the deco fireplace is tinted orange, as can be seen in the photos).A simpler approach would be to use a "breathing" warm white led lamp, or one or two of these, that simulates a flame: https://www.banggood.com/E27-B22-6W-SMD2835-Three-Modes-1300K-1800K-99LEDs-Yellow-Flame-Light-Bulb-AC85-265V-p-1211792.html

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  • Simplest 12V to 220V DC to AC Power Inverter DIY

    Colud be 25 ohm cold (see my answer to dcripe), but dcripe's calculations are right at rated voltage, once the filament gets hot.

    That would be with an ideal resistor, but filament resistance is very dependent on temperature, which in turn depends on dissipated power, so the behavior of a light bulb is highly non linear, much more than a conventional resistor. Resistance increases as current increases. This is true for most resistors (except for some designed with very low temperature coefficient materials, as current measurement shunts), the effect is not too important if the working temperature range is not high. In light bulbs this is clearly not the case, as it goes from room temperature to about 2600ºC.For example, I've just measured the resistance of a cold 230V 100W lamp and it is 40 ohms, while it's "nominal" resistance would be 230^2/100=529 ohm. If you connect this lamp to 12V DC it would ...

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    That would be with an ideal resistor, but filament resistance is very dependent on temperature, which in turn depends on dissipated power, so the behavior of a light bulb is highly non linear, much more than a conventional resistor. Resistance increases as current increases. This is true for most resistors (except for some designed with very low temperature coefficient materials, as current measurement shunts), the effect is not too important if the working temperature range is not high. In light bulbs this is clearly not the case, as it goes from room temperature to about 2600ºC.For example, I've just measured the resistance of a cold 230V 100W lamp and it is 40 ohms, while it's "nominal" resistance would be 230^2/100=529 ohm. If you connect this lamp to 12V DC it would dissipate 3.6 W (0.3A) in the first instant, after that the resistance would start to increase as the filament heats and the current and power would stabilize al a lower level (0.1 A measured with the same lamp, which means 1.2 W and 120 ohms) It's very little power to be useful (in fact, it doesn't even glow, just warms), but much higher than the theoretical 0.27 W that you would get with the nominal 529 ohms. This is with a 230V lamp, I imagine that a 120V one could get to glow at 12V (of course, much dimmer), but I don't have one to play with...

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  • morgan_flint commented on Kirand1's instructable The Pi Tablet3 years ago
    The Pi Tablet

    Good project!Could you post the link for the battery charging/step-up converter you used?Thanks!

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