Stephane Buisson ​ you wrote the k40 blue box smoothie upgrade wiki?

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@StephaneBUISSON ​ you wrote the k40 blue box smoothie upgrade wiki? I had a a quick question regarding the level shifter I see that the ground from the power supply is connect to the shifter on the power supply side but there is no ground connected on the 3.6v side… wiring up the shifter is where im hitting a roadblock I don’t want to mess it up

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@Alex_Krause in this wiki I explain what work for me (with this model of PSU), I replicate the connections used by the moshi to the psu (pwm).
Nano and other PSU combination could be different. (PWM->IN).
when you succeed, please add/edit blu-box guide.

Ground could be an issue (ground loop). see also https://plus.google.com/114978037514571097180/posts/cFoouZqQAng

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in my case, the level shifter have common 0V(G) on 3.3v&5V side. (from memory)