You can use getDurationBuffered() and apply scaling (to reduce the pulse rate). This will ensure you don't miss any pulses. You can even ignore the actual value returned, since you don't seem to care about the rate, but rather about the count. Each time getDurationBuffered() returns, it would mean that 16 pulses (or whatever your scaling is) were observed. So you'll end up with a somewhat cumbersome, yet accurate way to count your pulses.
On Wed, Aug 23, 2017 at 7:39 PM, Maximillian <[email protected]> wrote: > Fyi, I use this sensor. > https://www.seeedstudio.com/Water-Flow-Sensor-YF-B1-p-2878.html > > > On Thursday, August 24, 2017 at 9:38:08 AM UTC+7, Maximillian wrote: >> >> I think I could get around ~40 pulse per each call of flowMeter. >> getFrequencySync() in a Thread.sleep(100) loop. >> >> Is it still unsafe to just use the getFrequencySync() method for that >> amount of pulse? >> >> Or maybe I can just lower the sleep time to maybe Thread.sleep(50) for >> better accuracy? >> >> Thanks for the hint, I'll try to look into that. >> >> >> On Thursday, August 24, 2017 at 6:18:52 AM UTC+7, Ytai wrote: >>> >>> What's the maximum pulse rate for your application? >>> >>> On Wed, Aug 23, 2017 at 3:36 PM, Maximillian <[email protected]> >>> wrote: >>> >>>> Can you give more hint about how to count? >>>> >>>> I'm not really sure how to do it. >>>> >>>> Big thanks >>>> >>>> On Wednesday, August 23, 2017 at 11:56:20 PM UTC+7, Ytai wrote: >>>>> >>>>> Sampling the frequency and integrating will give you an estimate of >>>>> the total. If it's not accurate enough, you'll need to count. >>>>> >>>>> On Aug 22, 2017 2:51 PM, "Maximillian" <[email protected]> wrote: >>>>> >>>>>> Hi Ytai, >>>>>> >>>>>> This is my current code (trimmed for this post) >>>>>> >>>>>> >>>>>> int FLOW_METER_PIN = 14; >>>>>> >>>>>> volatile float pulseFreq, totalPulse; >>>>>> >>>>>> PulseInput flowMeter = ioio_.openPulseInput(FLOW_METER_PIN, >>>>>> PulseInput.PulseMode.FREQ); >>>>>> >>>>>> >>>>>> totalPulse = 0; >>>>>> >>>>>> public void loop() throws ConnectionLostException, InterruptedException >>>>>> { >>>>>> >>>>>> pulseFreq = flowMeter.getFrequencySync(); >>>>>> totalPulse += pulseFreq; >>>>>> //display totalPulse value to a textView; >>>>>> >>>>>> Thread.sleep(100); >>>>>> } >>>>>> >>>>>> >>>>>> Current behavior is already as I expected, the totalPulse textView will >>>>>> updated only when the hall sensor is spinning (flow detected) >>>>>> >>>>>> If I use the getFrequencySync() method, I think the loop is paused, >>>>>> waiting the flowMeter to receive input. >>>>>> >>>>>> If it received input, the totalPulse will increase by the amount of >>>>>> pulseFreq from getFrequencySync(). >>>>>> >>>>>> I haven't tested with real water yet (I just blow the flow sensor to >>>>>> make the hall spin for early development test) >>>>>> >>>>>> My question, is it correct to use this approach with the >>>>>> getFrequencySync() method? >>>>>> Or I still need to hack the DigitalInputImpl to count the pulses? >>>>>> >>>>>> Thanks >>>>>> >>>>>> On Wednesday, August 23, 2017 at 4:18:28 AM UTC+7, Ytai wrote: >>>>>>> >>>>>>> It is known, but there isn't currently a plan to add it. If anyone >>>>>>> wants to contribute a patch, I will happily consider adopting it. >>>>>>> >>>>>>> On Aug 13, 2017 8:21 PM, "Maximillian" <[email protected]> wrote: >>>>>>> >>>>>>>> Is this still a known missing feature? As this post is from 2013.. >>>>>>>> I need to use flow sensor as well.. >>>>>>>> >>>>>>>> On Monday, September 9, 2013 at 10:31:46 AM UTC+7, Ytai wrote: >>>>>>>>> >>>>>>>>> This is known missing feature. You can work around this by hacking >>>>>>>>> DigitalInputImpl to count the pulses: its setValue() method will get >>>>>>>>> called >>>>>>>>> on every edge. >>>>>>>>> >>>>>>>>> >>>>>>>>> On Fri, Sep 6, 2013 at 11:21 AM, jorge sb <[email protected]> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Hi. I want to connect a hall sensor flow meter to ioio. >>>>>>>>>> Perhaps, I could use "PulseInput" but after reading ioio-wiki, I >>>>>>>>>> see that I can't do it with it. >>>>>>>>>> Really, I need a simple pulse counter but without loosing any >>>>>>>>>> pulse. >>>>>>>>>> With flow meter I will like to get: >>>>>>>>>> - Total liquid flow (accumulated countered pulses) >>>>>>>>>> - Instant flow (reading difference between two counts in a >>>>>>>>>> measured time). >>>>>>>>>> >>>>>>>>>> With this sensor I could get a pulse every 50 msec or less at max >>>>>>>>>> rate. >>>>>>>>>> I think I could loose pulses doing periodic read of digital input. >>>>>>>>>> >>>>>>>>>> Some suggestion. >>>>>>>>>> Thanks. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>> Google Groups "ioio-users" group. >>>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>>> send an email to [email protected]. >>>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>>> Visit this group at http://groups.google.com/group/ioio-users. >>>>>>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "ioio-users" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to [email protected]. >>>>>>>> To post to this group, send email to [email protected]. >>>>>>>> Visit this group at https://groups.google.com/group/ioio-users. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "ioio-users" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> Visit this group at https://groups.google.com/group/ioio-users. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "ioio-users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at https://groups.google.com/group/ioio-users. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. 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