Hi Michael I too have used a ROACH 1 gpio to drive a phase switch at KHz rates. Our system used an optical isolated driver circuit between the GPIO and noise diode. I'm sure suitable parts could be purchased from an arduino reseller for next to nothing.
The importance of matching the driver circuit to 50ohms will depend on where you physically locate the driver circuit and how fast you need to drive the noise diode. On Thu, May 11, 2017 at 11:30 PM, Danny Price <dan...@berkeley.edu> wrote: > Hi Michael > > In the HIPSR system (https://arxiv.org/abs/1702.00443) we use the GPIO on > a ROACH1 to control the noise diode on the Parkes 64m, so definitely not a > bad venture! 0.5 Hz should not pose any difficulties. > > I would expect to measure closer to 5V (50 ohm terminated), but haven't > used the ROACH2 GPIO. > > Cheers > Danny > > On Thu, May 11, 2017 at 11:10 AM, Michael D'Cruze < > michael.dcr...@postgrad.manchester.ac.uk> wrote: > >> Dear all, >> >> >> >> I’m planning to use a 0.5Hz square wave, generated from the FPGA and >> output via sync_out, to eventually fire our cal diode (via much cabling). A >> quick hardware test today shows the sync_out port driving at circa 7V (!). >> This is a bit higher than I was expecting. Does this venture as a whole >> seem like a particularly bad idea to anyone with experience using sync_out? >> Is this output voltage roughly as expected? >> >> >> >> Thanks a lot, >> >> Michael >> >> -- >> You received this message because you are subscribed to the Google Groups >> "casper@lists.berkeley.edu" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to casper+unsubscr...@lists.berkeley.edu. >> To post to this group, send email to casper@lists.berkeley.edu. >> > > > > -- > Danny Price | dan...@berkeley.edu | +1 617-386-3700 <(617)%20386-3700> > > -- > You received this message because you are subscribed to the Google Groups " > casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
