Dennis Lee Bieber wrote:

> A 5-pack of TTLRS232 level shifters is available for only $6 via
> Amazon (US).
>

As said there is tons of crap and who buys on Amazon?!

> SparkFun has one that includes the DB-9 connector for $16
> https://www.sparkfun.com/products/449 Other than running wires between the
> R-Pi and the unit there isn't much to "build" (and this one likely can be
> mounted in a suitable hole in a chassis).

You can soldier your own RS323RS232 level shifter if skilled enough - it
would guarantee quality compared to the 5pack for 6US$ Amazon sh*t.

The parts cost me about 3-4,- the plastic case however cost 6,- :/. I added
some transistor, capacitor and diode for the feedback from the TTL
signalling.

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