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Topic: serial data voltage divider (Read 336 times) previous topic - next topic

xerxis

Hi,

for my project I need to go from 5V arduino RX/TX to 3.3V RX/TX from a bluegiga module. A very common problem and one that I usually solve with a level shifter. However at the moment I don't have one lying around and I was wondering if I could use a simple voltage divider instead. It would probably work at low baudrates, but would it still work reliably at higer baudrates?

JoeN

Got Zener?

http://www.instructables.com/id/Level-Shifting-Between-TTL-and-CMOS/step4/Using-a-Zener-Diode/
I have only come here seeking knowledge. Things they would not teach me of in college.

xerxis

Hmmm, I probably have some leftovers, good idea (and if not they are easy to find). I don't need bidirectional anyway, I'm only planning on using UART.

Thanks for idea!

I guess it would lead to less noise than a simple voltage divider.

jtw11

I asked this question a few days ago here, take a look - I got some good info.

http://arduino.cc/forum/index.php/topic,136788.0.html

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