Electronics > Projects, Designs, and Technical Stuff

Trick USB Device Into Thinking it is Plugged Into a Computer

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Bigjoe11:
Thank you for all the great replies, being that I have already attempted the resistor approach, I have purchased a smart charger that is supposed to negotiate the current: https://www.amazon.com/dp/B07XM9GQPJ/ref=cm_sw_r_other_apa_i_.SQVEb628V9ZX

I will be hooking this up to a 12v input source and testing. Thank you all for the input!

georges80:
^ that amazon unit is similar to a truckload of cheap car chargers. It won't be doing any USB enumeration, just relying on resistors on the D+/D- lines.

cheers,
george.

Bigjoe11:
I thought it might do the power negotiation because of this:

georges80:
^ for $6 I highly doubt there's anything special in there. Your expectations are much higher than mine :)

cheers,
george.

abyrvalg:
That could be just some MCU switching various resistor combinations to find out the one with max current. Seen such kind of charger already.

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