- serialport("COM6", 9600): This line creates a serial port object named arduinoObj to establish communication with the Arduino. It specifies the COM port ("COM6") and the baud rate (9600) to match the settings on your Arduino.
- flush(arduinoObj): This line flushes any existing data in the input buffer of the serial port. It ensures that you are reading fresh data.
- read(arduinoObj, 4, "uint8"): This line reads 4 bytes from the serial port using the read function. It specifies that the data should be interpreted as unsigned 8-bit integers (uint8). This matches the data format you're sending from Arduino.
Serial.Write Data to arduino and then read it in matlab
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I have an IMU set up on an arduino UNO, it uses Serial Write to make a dataframe with the gyro writing the X, Y and Z variables. I then open Matlab and want matlab to be able to read the varibles and I cannot get it to work
Here is the data frame, Someone told me how to write it, btu didn't really provide much info on why each thing is done a particular way. Any further info here would be helpful. (all variables are uint8_t)
Serial.write(3); %random number
Serial.write(9) ; % Number of serial writes
Serial.write(0); %Write a 0 here, packet sequence which is irrelevant
Serial.write(2) % random number
Serial.write(4) ; % random number
Serial.write(T) ; %First Varible I want to measure
Serial.write(X);%First Varible I want to measure
Serial.write(Y);%First Varible I want to measure
Serial.write(Z);%First Varible I want to measure
I don't really know what I am doing with the matlab code
arduinoObj = serialport("COM6",9600)
flush(arduinoObj)
data = read(arduinoObj,4,uint8)
- the 4 is also a random number, as far as i can tell thats the number of varibles I want to read which is 4
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Answers (1)
Vidip
on 2 Nov 2023
I understand that you have an Arduino UNO connected to IMU that collects data from a gyroscope (presumably measuring X, Y, and Z axes) and the Arduino is sending this data as a data frame over a serial connection to MATLAB to read and interpret these variables.
The Arduino code you provided is writing a simple packet of data to the serial port. The first two bytes are random numbers, which can be used to synchronize the sender and receiver. The third byte is a packet sequence number, which can be used to detect lost or out-of-order packets. The fourth and fifth bytes are random numbers, which can be used to fill up the packet and make it a consistent length. The sixth to ninth bytes are the data values that you want to measure, in this case the X, Y, and Z gyroscope readings. Also, different functions used for this are:
For further information, refer to the documentation links below:
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