It’s not too important that we get every pulse.
I tried the following code, but still get all zeroes:
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) throws ConnectionLostException
{
this.leftInput = ioio.openPulseInput(LEFT_ULTRASONIC_INPUT_PIN,
PulseMode.POSITIVE);
this.leftStrobe =
ioio.openDigitalOutput(LEFT_STROBE_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();
while (true)
{
float leftDistance = leftInput.getDurationBuffered();
if (leftDistance > .0000001)
{
break;
}
}
}
public float getLeftDistance()
{
return leftDistance;
}
}
What should I try next?
Thanks for the lead to the 4-pin sensors. I have ordered some…but since a lot
of the kids already have the 3-pin versions, I’m stuck with having to make that
work, too.
I use use a pretty simple circuit to separate the input from the
output…attached.
Thanks for all the great help.
On Apr 15, 2014, at 9:41 PM, Ytai Ben-Tsvi <[email protected]> wrote:
> Yes, that's what I meant when I said that you may miss the actual pulse.
>
> What about the following approach:
> beginBatch();
> sendPulse();
> endBatch();
> while (true) {
> float duration = pulseIn.GetDurationBuffered();
> if (duration > MIN_DURATION) return duration;
> }
>
> Of course, you can timeout if you want.
> With this approach, every pulse is captured and considered, and you're
> filtering out the really short ones that indicate the input pulses.
>
> BTW, there are equivalent ultrasonic range finders that have a more pleasant
> interface (for example, analog, or similar to the one you have but the
> feedback is on a separate pin). Here's one (available on DX for <$5):
> http://www.micropik.com/PDF/HCSR04.pdf
>
>
>
> On Tue, Apr 15, 2014 at 7:00 PM, Vic Wintriss <[email protected]> wrote:
> Ytai:
>
> With the sync() call after the endBatch() and before the getDuration() the
> program hangs up and I get no readings.
>
> Vic
>
> On Apr 15, 2014, at 5:32 PM, Ytai Ben-Tsvi <[email protected]> wrote:
>
>> This code doesn't have the sync() call I proposed. It should come after the
>> batch.
>>
>> On Apr 15, 2014 4:43 PM, "Vic Wintriss" <[email protected]> wrote:
>> Ytai:
>>
>> This code produces only 1.6875E-5…reading 2 times per second.
>>
>> 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) throws ConnectionLostException
>> {
>> this.leftInput = ioio.openPulseInput(LEFT_ULTRASONIC_INPUT_PIN,
>> PulseMode.POSITIVE);
>> this.leftStrobe =
>> ioio.openDigitalOutput(LEFT_STROBE_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.getDurationSync();
>> }
>>
>> public float getLeftDistance()
>> {
>> return leftDistance;
>> }
>> }
>> On Apr 15, 2014, at 4:27 PM, Ytai Ben-Tsvi <[email protected]> wrote:
>>
>>> Can you send me the most "correct" version of your code that demonstrates
>>> the issue?
>>> I can probably make the necessary changes to sync () if this is indeed a
>>> problem.
>>>
>>> On Apr 15, 2014 4:03 PM, "Vic Wintriss" <[email protected]> wrote:
>>> Thanks for the ideas. I've tried many combinations of synch,
>>> readBuffered...etc, but unfortunately it still reads very small
>>> numbers...probably measuring the last part of the trigger pulse. Is there
>>> any way that I can delay the read by a couple of hundred micro seconds?
>>> Could you do the..... sync() call "send" half inside the batch and "wait"
>>> half outside thing?
>>>
>>> Thanks for all the help. The kids are trying to use these sensors for
>>> iARoC 2014 (the International Autonomous Robot Competition) here in San
>>> Diego.
>>>
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