Thread: External keyboard with a kindle
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Old 12-27-2011, 02:59 PM   #23
geekmaster
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Posts: 6,433
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Join Date: Nov 2011
Location: Multiverse 6627A
Device: K1 to PW3
Here is the schematic for a level-shifter circuit that can connect a 5v or 3.3v TTL serial device to the kindle 1.8v TTL serial port:

https://www.mobileread.com/forums/sho....php?p=1897643

I tested this with a 3.3v USB TTL serial adaper (which needed to be modified by removing a status LED from its RxD pin).
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