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  • Arduino Programmable Constant Current Power Resistance Dummy Load

    All done. Works great. Thanks again Lee.

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  • Arduino Programmable Constant Current Power Resistance Dummy Load

    Dual channel project fired up for the first time. Still needs some assembly and tidying up inside, but very pleased with how this is coming along.Progress photos here: Front panel, showing first power on after LCD contrast adjusted; the mess inside yet to be sorted; one PCB after through hole components added; PCB fresh from the solder oven.Thanks again for the great instructable, and help along the way Lee!progress Lee!

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  • strykeroz followed wigman271 month ago
      • Arduino Programmable Constant Current Power Resistance Dummy Load
  • Arduino Programmable Constant Current Power Resistance Dummy Load

    Update: 2nd (ie 4th) one bootloaded and programmed just as easy, first try. Of course it helps I got the Atmega the right orientation first try too. Will post some images once the physical build is done.

    Hi LeeProgressing the dual channel one here. I recently grabbed one of those sparkfun AVR pocket programmers as you suggest above. Prior to using it on this new board I tried my trusty USBtinyISP and a USBasp and just like the first two failed boards couldn't get the ATmega to respond to take the bootloader. In contrast, using the Sparkfun programmer it took the bootloader first try. Then I was able to load the firmware over USB when reset pressed during upload.Can't be certain of course, but it may have been my first two PCBs were fine too, until I ultimately reworked them to death. Not sure if anyone else has had success with others, or if everyone here is also using the ISP programmer you show above but thought it worth documenting my experience. I use the other two programmers...see more »Hi LeeProgressing the dual channel one here. I recently grabbed one of those sparkfun AVR pocket programmers as you suggest above. Prior to using it on this new board I tried my trusty USBtinyISP and a USBasp and just like the first two failed boards couldn't get the ATmega to respond to take the bootloader. In contrast, using the Sparkfun programmer it took the bootloader first try. Then I was able to load the firmware over USB when reset pressed during upload.Can't be certain of course, but it may have been my first two PCBs were fine too, until I ultimately reworked them to death. Not sure if anyone else has had success with others, or if everyone here is also using the ISP programmer you show above but thought it worth documenting my experience. I use the other two programmers often, but this is the only Leonardo I've tried to use them with so there may be something to that.I'm off to bake the second board now...

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