Re: [Gumstix-users] Tachometer

[Dave H. <dhy...@gm...>]

Hi Augstin,

> I was working with tachometer program, rigth now i can see the blue led
> changing with the frecuency, but i can see the data in UART0 port, Im using
> max232 to change the voltage levels i didnt check if the power or the
> robostix regulator was enougth(?). Other thing that is rear is the voltage
> betewen power pins give me 200mV when nothing is conected, only in UART0,
> the other three ports seems be fine. im worried about...
>  My UART0 is burned?

Are you using a robostix in standalone mode? Or with a gumstix? Which
revision of robostix board?

Be aware that the Gnd pin on the UART-0 connector isn't connected on
the early robostix. See:
<http://docswiki.gumstix.com/Robostix_modifications#Ground_Wire_Fix_.28robostix_revisions_prior_to_1131.29>

The power pin on the UART connector is called V_BATT and you should be
measuring 5v on this pin (although if you were using the ground on the
same port and it was floating, then that could explain what you're
seeing).

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/