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Originally Posted by Yorker
I decided to try and solder what i have to the kindle, very tiny points it was a mess....
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Yeah, it is indeed messy. But look at my setup ... don't solder stuff directly to the Kindle. Solder a cable like I did, then solder stuff to the cable as not disfigure the Kindle itself.
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Eventually i think i succeeded since i checked the voltage with the multimeter.
For some reason the USB\TTL adapter didn't light up on TX but RX and GND were fine.
GND was wrapped around a screw so that is sold while TX and RX were soldered so it's strange.
I checked the voltages and TX was getting 0.9 while RX got 3.3 so i guess based on experiments if its less than 1 it doesn't light up
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At which point did you check the voltages? At the adapter or at the Kindle?
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Also on the dmesg it showed as follows:
Code:
[ 0.850853] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
But after disconnecting it still shows that so it's not related to the adapter
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Why are you expecting that
dmesg entry to disappear?
dmesg is a log ... plug events don't disappear from there when unplugged. Try with a USB drive and see the entries for yourself.
By the way, the adapter is usually
ttyUSB0.
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Does this mean i need 1.8?
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If Tx were to read 1.8 volts, then yeah, but reading 0.8 volts is strange. Unless you weren't reading from the Kindle, or you have something causing an inaccuracy.
These are good. I'm not an electrician, but I do remember Ohm's Law being useful for these. Not sure of the exact calculation needed.