Electronics Explorer power supplies

[whbweb]

Hi. I'm working with the SDK and finally got to the point that I can control the Vcc power supply to be either 3.3 V or 5.0 V. It seems the channel numbers are 0 = Vcc, 1 = VP+, 2 = VP-, 3 = Vref1 and 4 = Vref2.

 

Something like this

dwf.FDwfAnalogIOChannelNodeSet(hdwf, c_int(1), c_int(0), c_double(True))
dwf.FDwfAnalogIOChannelNodeSet(hdwf, 1,1,c_double(1.86))

will work fine and give me 1.86 V or close to it, but if I try to go past about 2 V, it seems like it can't get there and fluctuates a lot. I'm not sure of the difference between AnalogIOChannelNodeStatusInfo and AnalogIOChannelNodeSetInfo, but it seems that these can go to 0 to 10 V in 1000 steps or so. The Waveforms software has no problem driving them to +10 or -10 or anything in between. Any idea what I could be doing wrong?

[attila]

Hi @whbweb,

Try specifying a current limitation, like 0.5A
dwf.FDwfAnalogIOChannelNodeSet(hdwf, 1, 2, c_double(0.5)) # channel 1 = VP+, node 2 = current limitation

*SetInfo returns the settable range, like voltage and current limitation setting
*StatusInfo returns the reading range, like voltmeter and ammeter on supply channels

[whbweb]

That did it! Thanks!