Since you pass 'Terminator', 'CR/LF' in the serial port open call, you can replace if s.BytesAvailable >= 13 Maybe there's some way to read in all the data and process it after completion? I've been thinking that the conditionals might be slowing it down, but they also seem to be necessary to keep things in the '%i %i ' format that I need. % Inputs to serial device: T1, T2, runtime (seconds)įprintf(s, sprintf('%d %d %d ', T1, T2, timer)) ĭata = fopen(sprintf('%s.txt',date_and_trial),'w') įprintf(data, sprintf('%d %d ', tdata(i,1), tdata(i,2))) Here's what I'm using to read in data: s = serial('COM1', 'BaudRate', 115200, 'DataBits', 8, 'Terminator','CR/LF', 'InputBufferSize', 1024) Are there any known issues with Matlab's speed in this area? I wanted to automate the process and control the device entirely through Matlab, but discovered that less than half of the data gets through to Matlab. I've been capturing my data using HyperTerminal, which seems to be able to keep up with the device.

Other microcontrollers and single board computers.I've got a detector that spits out two numbers at a high rate when I turn it on.

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However, I get weird numbers as an output of the matlab code, like 10, 13, 53.Ĭan someone help me fix my code to make the matlab output '3'?

in hopes that the serial port would take the number found in the serial monitor of the arduino would be the input of the serial port for the matlab code. I would then like to import that information to matlab so i can create a graph. The output on the serial monitor should repeatedly output the distance, like: object we take half of the distance travelled. The ping travels out and back, so to find the distance of the The speed of sound is 340 m/s or 29 microseconds per centimeter. Long microsecondsToCentimeters(long microseconds)

and return, so we divide by 2 to get the distance of the obstacle. This gives the distance travelled by the ping, outbound According to Parallax's datasheet for the PING))), there are Long microsecondsToInches(long microseconds) the loop routine runs over and over again forever:ĭelay(1) // delay in between reads for stability initialize serial communication at 9600 bits per second: Hello, I am trying to make an ultrasonic sensor with arduino and an ultrasonic transducer using the following arduino code that outputs the number '3' to the serial port:

Matlab serial port