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Old 05-28-2016, 02:24 PM   #135
geekmaster
Carpe diem, c'est la vie.
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Posts: 6,433
Karma: 10773670
Join Date: Nov 2011
Location: Multiverse 6627A
Device: K1 to PW3
The kindle Tx cannot sink enough current to light an LED if your TTL serial adapter has an LED on that line. It prevents the kindle from sending a logic zero. See my level shifter circuit thread.
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