Hi, can you give more information on your sensor, such as what kind of signal (digital/analog, what resolution is needed, really 500MHz signal bandwidth)? I am using the BBB PRU for some realtime feedback application. In principle, the PRU works at 200 MHz, so with one PRU, you can change the signal at the 15 available digital output pins once every 5 nanoseconds (or equivalently read them out that fast), but you would need to reserve some cycles for signal input. In my application, I used the integrated analog input of the beaglebone black, which drastically limits the input sampling frequency to slighly above 1MHz. If sampling at 1 MHz is enough for you (which i believe it should be, as I can hardly imagine a valve which can react within 1 microsecond), then the PRU can solve your problem. Of course, you would probably have to amplify the output from the Beaglebone as the output pins deliver only a few milliamperes of current.
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