that seems to be the case! thanks
tim On 30 Oct 2008, at 17:41, Martin Peach wrote: > Tim Boykett wrote: >> We are having trouble with a PD - Arduino - Sharp IR gp2d12 IR >> range sensor. >> >> everything works for a while, then the arduino just stops and >> sometimes >> takes PD down with it. once we had a warning from the OS that there >> was too much current >> being sucked on the USB port. >> >> we are using three such things, each uses typically 33 and up to 50 >> mA. This >> should (according to the Arduino and USB specs) not be too much, but >> perhaps >> these are wrong. > > I have built a circuit with six of those sensors on an Arduino > Diecimila, it > worked fine with external power, but I didn't even try it with USB > power > because for me 50mA is too much. (At first it crashed sporadically > because I > was sending too much data through the serial port.) The actual USB > port you > are using may not be able to supply that much current even if the USB > circuit is able to handle it. If it only happens occasionally it's > probably > because the sensors sometimes pull more than the average current, so a > ~100uF capacitor on the power pins would help, but you should really > use a > separate power supply for the sensors, or just power the entire > Arduino > externally. > > Martin > > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list