4/11/2023 0 Comments Arduino drawing vector code![]() Something is still a bit strange with your setup. %> and allows PTB to continue its display loop without interupption. ![]() %> Also added a timedTTL function, which performs the TTL timing on the arduino %> This version uses IOPort from PTB, as it is faster: ![]() %> Giampiero Campa, Aug 2013, Copyright 2013 The MathWorks, Inc. %> This class defines an "arduino" object, MATLAB Legacy toolbox. returns immediately to MATLAB even if the %> interface for serial communication and adding a new timedTTL function for %> arduinoIOPort - modified legacy ardino interface using PTB IOPort iandol/opticka/blob/master/communication/arduinoIOPort.m % = IOPort('ConfigureSerialPort', conn, 'ReadTimeout=1.5'), I added a function to wrap this with arduinoIOPort.m too: a.configure('ReadTimeout=1.5'). You can use configure to change the timeouts, e.g. I noticed the first read of the Uno sometimes is delayed, so perhaps you are hitting the IOPort timeout? I’ve tweaked the code a bit for both adio.ino and arduinoIOPort.m. Hm, I just tested with an Uno clone and a Seeeduino Xiao and I do get data back, and it is 3 bytes for digitalRead ( ). (or any other serial terminal) by typing commands like:Ġe0 : assigns digital pin #4 (e) as inputĠf1 : assigns digital pin #5 (f) as outputĠn1 : assigns digital pin #13 (n) as output Package, however, it can be used from the IDE environment This file is meant to be used with the MATLAB arduino IO This version is modified for timed TTLs (see command 50) Giampiero Campa, Copyright 2013 The MathWorks, Inc * Analog and Digital Input and Output Server for MATLAB You can use any serial terminal to send these commands: iandol/opticka/blob/master/communication/arduino/adio/adio.ino The sketch is a simple state machine that uses the first byte to change state then process the parameters. The interface is really simple, you send bytes encoding the action required and the parameters, so for example, sending the serial command 0c1: 0=set pin mode as input or output | c=use pin 2 | 1=set to output. ![]() This utilises an arduino sketch that acts as a server receiving commands and then performing the task. Hi Steve, I use a slightly modified version of the MATLAB legacy arduino interface. for timed TTLs, it is better to send the timing command to the Arduino, that way MATLAB returns immediately and doesn’t wait for the digitalWrite to finish. fast monitor or complex stimuli), then this should help… If you need to send triggers in a PTB drawing loop and you don’t have much overhead (i.e. However, IOPort is still much faster than either MATLAB option, I was quite surprised as normally you cannot achieve such fast command-response times with USB devices (the Seeduino Xiao is faster than an Arduino Uno and uses USB 3). The new serialport is clearly faster than the old one, and the variance is considerably lower. I also used a simplistic method to generate a 1ms TTL using digitalWrite(1) WaitSecs(0.001) digitalWrite(0) to see how close to 1ms we got: Serial ![]() I used an oscilloscope to ensure the output signal was well formed, and used its measurement function to measure average rise-time widths. t = tic įprintf('It took %.4f seconds for 10,000 iterations\n',toc(t)) I used the legacy MATLAB arduino interface sketch, which receives and sends the data via USB serial commands. In addition I also compared IOPort, the PTB serial controller.įor the test I basically toggled the state of a digital pin on a Seeduino Xiao as fast as possible. So I was curious to compare the old and new interfaces. Some of my arduino control code had previously used the serial command that MATLAB has now deprecated. MATLAB has a fairly new (R2019B ) serial port interface, Serialport. ![]()
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