Comments: Atto84 Hookup Guide

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  • Ok what's the deal with these little boards? I bought 2 of them. Gave 1 to my brother-in-law and kept one to myself. Neither one of us can even get these boards to turn on, the LED doesn't even blink. I followed the Hookup Guide exactly and all the steps were successful, according to the guide. But when I go to load to the Arduino IDE there is no COM port recognized, it's like nothing's plugged in. My brother-in-law didn't have any success either and he tried it on the Mac, I'm using windows. So basically I bought 2 bricks. Any ideas here from Sparkfun Engineering or the peanut gallery? Thanks!

    • Hi there, in case no one chimes in... unfortunately, this is a SparkX product and you may need to go to the forum. As mentioned on the product page and at the beginning of the hookup guide:

      "These products are tested but come with no guarantees. Live technical support is not available for SparkX products. (Feel free to head on over to our forums for support or to ask a question.)"

      That being said, I think your issue might be answered in the Gotchas section of the hookup guide:

      "Most USB Arduino boards can be forced into bootloader mode by the Arduino IDE during programming, but due to the limitations of V-USB, the Atto84 needs to be manually reset during programming. Every time the Atto84 restarts, it goes into bootloader mode for about 5 seconds. During this time, your computer will recognize it as a USB device. After 5 seconds, the Atto84 begins running user code. Unless your code also happens to be implementing V-USB, the computer will stop recognizing the device."

  • So i was trying to use the blink example in ide 1.8.5 and pin 8 or LED_BUILTIN and no blink but i kept getting micronucleus telling me thank you, I grabbed the atto84 to unplug from usb and the led glowed dim. Finger probes showed pin 2 was making the magic happen so i just used pin 2 in the ide and I have a blinking led. Whats up with that?

    • This is interesting because the ATtinycore has two pin numbering schemes, clockwise and counter-clockwise. Pins 8 and 2 are complementary pins. I'll see if I can reproduce the error and fix it in an update to the board profile.


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