Archived Forum

http://jeelabs.org/2009/12/10/uploading-and-ftdi/

I think that answers your question.

How so?​

One detail remains, which makes the USB-BUB a slightly better choice for such an FTDI hookup: the interface needs to supply 5V to the attached JeeNode, but it also should use 3.3V logic levels for the RX/TX lines, because a JeeNode operates at 3.3V internally. If you look closely, you can see that the “Logic Lvl” on the BUB has been jumpered to 3.3V with a little wire.

The Sparkfun FTDI adaptor comes in two different versions for 3.3V and 5V, but they appear to use the same voltage for both power and logic levels.

The question remains, does the FTDI adapter sold here use 3,3V or 5V for RX/TX? Either way, I bought a USB-BUB from JeeNode instead, to be on the safe side.

Your original question was less than clear, so lets start again. What is the question you are asking? Are you talking about any FTDI programmer, or one from the OEM Shop?

Sorry, I'll try again :)

The FTDI adapter (Nanode FTDI) sold here in the OEM shop, outputs 5V for powering the connected hardware (as far as I know). The logic levels for the RX/TX can then be either 3,3V or 5V, this is the information I was interested in, since JeeNodes requires 3,3V and not 5V.

I ended up ordering the USB-BUB from JeeLabs anyway since I wanted to get the stuff shipped and I wanted to be on the safe side and not smoking my new JeeNodes.

The Shop version works at 3.3 V to my emonTx.

In that case, I have two usable FTDIs now. Ah well, the more merrier :)

Thanks for the help Robert!