How to produce a pulse for 10Microseconds?

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kintali narendra
kintali narendra 2017-2-12
评论： Walter Roberson 2017-2-22
I am programming my Arduino from matlab(I installed supporting package), in order to use Ultrasonic sensor I need to produce a trigger pulse for 10microseconds(from matlab) and I also need to read the time in microseconds. please tell me how to produce a delay of 10us or produce a constant value for 10us. I am using matlab2014b.
I need to produce the pulse in Yellow from matlab and read the pulse in Red in Matlab. Both are in microseconds thank you

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回答（1 个）

Walter Roberson
Walter Roberson 2017-2-21
Technical notes:
Looking at:
https://www.arduino.cc/en/Tutorial/SecretsOfArduinoPWM
Arduino code would look something like
digitalWrite(13, HIGH);
delayMicroseconds(10);
digitalWrite(13, LOW);
where the 13 would have to be adjusted to the appropriate pin number.
The MATLAB interface to digitalWrite is writeDigitalPin: https://www.mathworks.com/help/supportpkg/arduinoio/ref/writedigitalpin.html
The difficulty with using this is the timing: there is no way in MATLAB to pause for less than 1/1000 of a second (and you cannot even do that well on MS Windows.) If you could pause for that short of a period, the time required to send the new data to arduino would add a lot of uncertainty.
It would therefore be better to program the 10 microsecond pulse on the arduino side.
With regards to the TTL signal: is the idea that you get a response by reading the voltage? If so then it becomes important to know the minimum and maximum voltages. Or does "range in proportion" refer to time?
  2 个评论
kintali narendra
kintali narendra 2017-2-22
Sir, I wont be reading voltage, I need to read, for HOW much time the pulse is HIGH ?, In arduino we have a inbuilt command called PULSEIN. Can you please suggest any equivalent command to that in MATLAB.
Walter Roberson
Walter Roberson 2017-2-22
I would not attempt to trigger a PULSEIN from the MATLAB level: your timing is too strict.
Always keep in mind: your MATLAB session might get suspended for an unknown number of hours while your PC does virus checking, or fetches email, or updates a "Push" page in the web browser you left open, and so on. MS Windows is not a real-time operating system and MATLAB itself does not try to be a real-time program.
I see https://www.mathworks.com/matlabcentral/answers/33710-how-to-replicate-an-arduino-timer-function-in-matlab showing code you can use on the Arduino side.

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