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Topic: TTL to LVTTL (Read 2078 times) previous topic - next topic

alecjcook

Hi,
  I have a LVTTL GPS device(Rx & Tx lines) I am trying to convert the TTL from the arduino into LVTTL. Do I need to? Can I plug these straight into each other?
  The only place I can find a part to do it is Farnell, and they have a minimum order of £20 and a £15 P&P charge... The actual part is 7p!!!

Do i need to bother? or will I blow my GPS?

Leon Heller

#1
May 06, 2010, 04:33 pm Last Edit: May 06, 2010, 04:33 pm by leon_heller Reason: 1
What GPS is it?

What is the Farnell order code? I'm just about to place an order with Farnell UK and I could add it, then post it on. I don't pay for shipping.
Leon Heller
G1HSM

alecjcook

1631692. if you could grab me 10 it should be 67p. your a legend man!
the module is a LS-40EB-5V. (I'm hoping to stick it all in a high altitude balloon when i'm done!) :D

MarkT

To drop 5V signals to 3.3 use a resistive divider with something like 1k between devices and 2k2 to ground at the low voltage side.  Don't connect directly, that could easily blow something.

To boost 3.3V signals up to the Arduino, you probably don't need to, the thresholds are OK if the GPS puts out rail-to-rail logic (CMOS) levels.
[ I won't respond to messages, use the forum please ]

Leon Heller

#4
May 06, 2010, 09:47 pm Last Edit: May 06, 2010, 10:02 pm by leon_heller Reason: 1
I've seen MOSFETs used for level conversion, I suppose that is the same sort of idea. I've ordered some for myself, as well. They might come in useful.
Leon Heller
G1HSM

flytroll

Hello,

What can you say about Skylab SKM53 module
ttp://www.skylab.com.cn/datashe...Nav_SKM53_DS.pdf
?

Thanks for help. Needed very much.

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