I work with Vic and I have followed this thread. I have tried many of the suggestions you have made. The primary result I see is that the getDuration call hangs.
For background, Earlier version of the IOIO software had worked quite well. I ran it many times and was able to use the getDuration result with a calibrated constant to get readings in mm using the PING transducer. The I have seen the signals on my scope and the frustration is that my code used to work well. Hope you can help. Duane On Friday, April 25, 2014 4:40:07 PM UTC-7, Ytai wrote: > > https://groups.google.com/d/msg/ioio-users/B6dTfB2scpI/b0o8Q15SEwgJ > > > On Fri, Apr 25, 2014 at 3:09 PM, Vic Wintriss > <[email protected]<javascript:> > > wrote: > >> Could you give me a simple example of how to interrupt getDuration(). I >> checked the TimerTask forum, but am not sure that I understand. I assume >> that getDuration() is blocking. >> >> >> On Wednesday, April 23, 2014 9:21:54 PM UTC-7, Ytai wrote: >> >>> Nope. The PulseInput module was really not designed for such a use-case. >>> If you had only the output pulses on the input things would "just work". >>> Try the AND gate trick. >>> >>> >>> On Wed, Apr 23, 2014 at 9:15 PM, Vic Wintriss <[email protected]>wrote: >>> >>>> I have tried all combinations of opening pulse input after sending the >>>> trigger pulse...no luck. I am reading both the output (trigger pulse) and >>>> the echo (return) pulse...alternately. About 5 trigger pulse readings to >>>> each echo pulse reading. Any work around ideas? >>>> >>>> >>>> On Wednesday, April 23, 2014 8:44:02 PM UTC-7, Ytai wrote: >>>> >>>>> Opening the pulse input after sending the pulse should have done that. >>>>> You shouldn't be able to get a pulse from the past the way you're doing >>>>> this. Are you saying that what you're reading back is the output pulse? >>>>> It is possible that there's a bug in the firmware side on the >>>>> PulseInput implementation in that case. >>>>> >>>>> >>>>> On Wed, Apr 23, 2014 at 2:33 PM, Vic Wintriss <[email protected]>wrote: >>>>> >>>>>> I'm using 0503. >>>>>> >>>>>> The problem is that the ping and the return are getting out of sync. >>>>>> The getDuration() readings match exactly the times that I see on the >>>>>> scope. >>>>>> How can I synchronize so that I only start listening after the ping >>>>>> pulse is complete? >>>>>> >>>>>> >>>>>> On Wednesday, April 23, 2014 8:51:26 AM UTC-7, Ytai wrote: >>>>>> >>>>>>> Are you using the latest firmware? >>>>>>> Also, cancellation is supported. Search the forum for TimerTask. >>>>>>> >>>>>>> >>>>>>> On Tue, Apr 22, 2014 at 10:10 PM, Vic Wintriss >>>>>>> <[email protected]>wrote: >>>>>>> >>>>>>>> I tried the following: >>>>>>>> >>>>>>>> public void read() throws ConnectionLostException, >>>>>>>> InterruptedException { >>>>>>>> >>>>>>>> ioio.beginBatch(); >>>>>>>> >>>>>>>> leftStrobe.write(false); >>>>>>>> >>>>>>>> leftStrobe.write(true); >>>>>>>> >>>>>>>> leftStrobe.write(false); >>>>>>>> >>>>>>>> leftInput = ioio.openPulseInput(LEFT_ULTRASONIC_INPUT_PIN, >>>>>>>> >>>>>>>> PulseMode.POSITIVE); >>>>>>>> >>>>>>>> ioio.endBatch(); >>>>>>>> >>>>>>>> leftDistance = (int) (leftInput.getDurationBuffered() * 1000000); >>>>>>>> >>>>>>>> leftInput.close(); >>>>>>>> >>>>>>>> SystemClock.sleep(100); >>>>>>>> >>>>>>>> dashboard.log(leftDistance + ""); >>>>>>>> >>>>>>>> } >>>>>>>> It makes one reading and then hangs up. How do I time out if I >>>>>>>> want stop waiting? >>>>>>>> I put the scope on the sensor and discovered that I am reading >>>>>>>> alternately both the trigger pulse and the echo pulse...most often the >>>>>>>> trigger pulse. >>>>>>>> >>>>>>>> On Tuesday, April 22, 2014 5:05:23 PM UTC-7, Ytai wrote: >>>>>>>> >>>>>>>>> No, there isn't, and even if there were, I'm not sure this will >>>>>>>>> actually do what you want. >>>>>>>>> Have you tried the hack I recommended on the previous post? >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Apr 21, 2014 at 8:36 PM, Vic Wintriss <[email protected] >>>>>>>>> > wrote: >>>>>>>>> >>>>>>>>>> Good idea about the logic fix. I’m redoing the interface boards, >>>>>>>>>> so I might add that logic. >>>>>>>>>> If I am, in fact, reading part of the trigger pulse, is there any >>>>>>>>>> way of imposing a short, predictable delay…say 50 microsecs…after >>>>>>>>>> the >>>>>>>>>> trigger pulse but before the getDuration() read? >>>>>>>>>> >>>>>>>>>> On Apr 21, 2014, at 5:12 PM, Ytai Ben-Tsvi <[email protected]> >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>> Good catch, I forgot about this constraint. >>>>>>>>>> In that case, this (similar to what you've proposed) approach >>>>>>>>>> might work: >>>>>>>>>> >>>>>>>>>> beginBatch(); >>>>>>>>>> generatePulse(); >>>>>>>>>> openPulseIn(); >>>>>>>>>> endBatch(); >>>>>>>>>> getDuration(); >>>>>>>>>> closePulseIn(); >>>>>>>>>> >>>>>>>>>> I'd like to emphasize that the fact we have to jump through weird >>>>>>>>>> hoops to get is working is mostly due to the fact that this sensor >>>>>>>>>> has a >>>>>>>>>> weird interface. BTW, another thing you can do is use a discrete >>>>>>>>>> logic gate >>>>>>>>>> to filter out the ping input pulse from the output. Something like: >>>>>>>>>> clean_out = ping_pin & !ioio_pulse_out_pin >>>>>>>>>> >>>>>>>>>> This will convert the Ping's interface to be similar to the one >>>>>>>>>> of the other sensor I referred you to. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Mon, Apr 21, 2014 at 3:23 PM, Vic Wintriss < >>>>>>>>>> [email protected]> wrote: >>>>>>>>>> >>>>>>>>>>> I don't think that I can use getDurationBuffered() in this >>>>>>>>>>> case. The getDuration() Interface notes say: "...Note that once a >>>>>>>>>>> pulse is >>>>>>>>>>> detected, the next one must have its leading edge at least 5ms >>>>>>>>>>> after the >>>>>>>>>>> leading edge of the current one, or else it will be skipped." The >>>>>>>>>>> ping >>>>>>>>>>> pulse is about 50 microsecs long, and the echo pulse comes about >>>>>>>>>>> 750 >>>>>>>>>>> microsecs after the ping pulse, If I am getting the last part of >>>>>>>>>>> the ping >>>>>>>>>>> pulse, the echo pulse will come too soon for getDurationBuffered() >>>>>>>>>>> to >>>>>>>>>>> acquire the echo pulse. Am I understanding this right? >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Sunday, April 13, 2014 7:22:39 PM UTC-7, Vic Wintriss wrote: >>>>>>>>>>>> >>>>>>>>>>>> I am trying to use the Parallax Ping))) ultrasonic sensor with >>>>>>>>>>>> a ioio V1 board, using the IOIO00503 library. I get a good >>>>>>>>>>>> looking >>>>>>>>>>>> signal...see the attached scope view, but the input.getDuration() >>>>>>>>>>>> call >>>>>>>>>>>> returns 16.8 micro seconds most of the time, called 2 times per >>>>>>>>>>>> second. >>>>>>>>>>>> Every once in a while I get the proper number. >>>>>>>>>>>> >>>>>>>>>>>> Any ideas? Here is the code: >>>>>>>>>>>> >>>>>>>>>>>> import ioio.lib.api.DigitalOutput; >>>>>>>>>>>> >>>>>>>>>>>> import ioio.lib.api.IOIO; >>>>>>>>>>>> >>>>>>>>>>>> import ioio.lib.api.PulseInput; >>>>>>>>>>>> >>>>>>>>>>>> import ioio.lib.api.PulseInput.PulseMode; >>>>>>>>>>>> >>>>>>>>>>>> import ioio.lib.api.exception.ConnectionLostException; >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> public class UltraSonicSensors >>>>>>>>>>>> >>>>>>>>>>>> { >>>>>>>>>>>> >>>>>>>>>>>> private static final int LEFT_ULTRASONIC_INPUT_PIN = 35; >>>>>>>>>>>> >>>>>>>>>>>> private static final int LEFT_STROBE_ULTRASONIC_OUTPUT_PIN = >>>>>>>>>>>> 15; >>>>>>>>>>>> >>>>>>>>>>>> private final PulseInput leftInput; >>>>>>>>>>>> >>>>>>>>>>>> private DigitalOutput leftStrobe; >>>>>>>>>>>> >>>>>>>>>>>> private float leftDistance; >>>>>>>>>>>> >>>>>>>>>>>> private IOIO ioio; >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> public UltraSonicSensors(IOIO ioio) throwsConnectionLostException >>>>>>>>>>>> >>>>>>>>>>>> { >>>>>>>>>>>> >>>>>>>>>>>> this.leftInput = ioio.openPulseInput(LEFT_ULTRASONIC_INPUT_PIN, >>>>>>>>>>>> PulseMode.POSITIVE); >>>>>>>>>>>> >>>>>>>>>>>> this.leftStrobe = ioio.openDigitalOutput(LEFT_ST >>>>>>>>>>>> ROBE_ULTRASONIC_OUTPUT_PIN); >>>>>>>>>>>> >>>>>>>>>>>> this.ioio = ioio; >>>>>>>>>>>> >>>>>>>>>>>> } >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> public void read() throws ConnectionLostException, >>>>>>>>>>>> InterruptedException >>>>>>>>>>>> >>>>>>>>>>>> { >>>>>>>>>>>> >>>>>>>>>>>> read(leftStrobe, leftInput); >>>>>>>>>>>> >>>>>>>>>>>> } >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> private void read(DigitalOutput strobe, PulseInput input) >>>>>>>>>>>> throws ConnectionLostException, InterruptedException >>>>>>>>>>>> >>>>>>>>>>>> { >>>>>>>>>>>> >>>>>>>>>>>> ioio.beginBatch(); >>>>>>>>>>>> >>>>>>>>>>>> strobe.write(true); >>>>>>>>>>>> >>>>>>>>>>>> strobe.write(false); >>>>>>>>>>>> >>>>>>>>>>>> ioio.endBatch(); >>>>>>>>>>>> >>>>>>>>>>>> this.leftDistance = input.getDuration(); >>>>>>>>>>>> >>>>>>>>>>>> } >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> public float getLeftDistance() >>>>>>>>>>>> >>>>>>>>>>>> { >>>>>>>>>>>> >>>>>>>>>>>> return leftDistance; 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