Hi, I used 2 different R (1ohm and 25ohm) with large delay between sending/receiving packets (around 30s). Since there are spikes (even in the sleep mode), I use oscilloscope's average value.
Thus, to get the whole current consumption, I measured the sleeping current first (using 25ohm). Then I measured the send/receiving packets part (using 1ohm). The total current consumption is the first measurement added to the second. I dont think that my way result in the exact current consumption. But at least it gives me a figure of the power performance. But I'm interested to hear other way to measure (not simulate) this motes. Any other suggestions ? Regards, -daniel -------- Original Message -------- > From: "Murray, Ben" <[EMAIL PROTECTED]> > Sent: Tuesday, August 28, 2007 6:58 PM > To: > Subject: RE: [Tinyos-help] The power consumed > > How do you deal with the huge changes in current (10 milliamps to 10 > microamps), or deal with the corresponding large jumps in voltage at the > oscilloscope/voltmeter? With an oscilloscope that can manage two millivolts > per division, and a 220 ohm sense resistor, 10 microamps should give you a 2 > mV difference across resistor, while at approx 10 milliamps (start-up > current) you will get almost a 2 volt difference? We tried to overcome this > by using a schottky diode bypass for the start up current, but I am still > getting current readings in the 100 plus microamps region, that are not in > line with the expected sleep current for null (five microamps). A problem > of dealing with these huge variations affects the use of ammeters as well. > > Exactly what sort of set up should I be using to get these five microamps > readings that everybody is posting? Sense resistor values, oscilloscope > scales, ammeter sensitivities, etc would be very useful! > > Thanks very much in advance! > -Ben _______________________________________________ Tinyos-help mailing list Tinyos-help@Millennium.Berkeley.EDU https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
