Lo solucionaste?, si es asi, como lo hiciste, gracias El miércoles, 30 de octubre de 2013, 13:57:53 (UTC-5), jred...@gmail.com escribió: > > I'd like to use my BeagleBone Black to build a small power efficiency > station for my school. For that I plan to measure power consumption using a > current transformer and a voltage transformer, feed the data into a small & > fast database and show it through a web interface to the school staff. > I see that 50 Hz are not a problem for BB ADCs, but I'm not sure at all > using them is a good idea. > Intially I planned to use the same voltage I must measure to power the BB. > I'm starting from a circuit like the attached one (replacing the UA78M33 by > a UA7805CKCT which provides up to 1.5 A output) > > > <https://lh4.googleusercontent.com/-Rh9IrbXEzAU/UnFV0UcdTSI/AAAAAAAAEAM/TduMV2A5CT4/s1600/adc.jpg> > > Changing the R1/R2 divisor I can make the 220V signal lower , but I'd > always get a signal with a negative side (-0.9V - +0.9V) in the best case. > Same for the current transformer, after applying its output to a 100 ohms > resistor. So, first, is it an awful idea to use BB for this purpose? If > not, how can I avoid the negative part of the signal before feeding the BB > ADCs? > > Thanks in advance >
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