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Support Forum » Doesn't write often

July 10, 2011
by BlueFusion
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I just got my NerdKit a few days ago and have been playing with it a bit. I can't get it to write compiled code to the MCU 9/10 times. I have to keep disconnecting and reconnecting the USB and battery and try again and again and again. Eventually it will work, but it takes many attempts and I can't see any reason for this.

All wires seem firm, and when it does flash, the initload code works as expected. I can't figure out what is wrong here. Any ideas or tips/tricks?

I am using Gentoo Linux with the 2.6.39 kernel.

July 11, 2011
by Ralphxyz
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Hi BlueFusion, welcome!!

You might be suffering from the notorious yellow wire syndrome!

If you search the Nerdkit forum you will see lots of discussions and that you are not alone.

Noter has a nice MOSFET solution in my yellow wire thread Humberto had suggested that I add a switch to the yellow wire.

The problem is that there is, on some computers, 2.4volts on the yellow wire that does not allow you to switch states (run/programing).

Recently I have found adding a switch on the reset pin alleviates the hangup problem with the yellow wire but the wire is always energized. Here is Rick's thread on adding a reset switch.

I want to implement Noters solution but for now the reset switch is working great.

That is a momentary close normally open switch not a toggle switch!


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