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Interfacing Red Pitaya With Matlab

Made by yeshvanth-m

About the project

Interfacing Red Pitaya with MATLAB

Project info

Difficulty: Moderate

Platforms: Digilent, Red Pitaya

Estimated time: 1 hour

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	IC 555 Pulse Generator Circuit	x 1
	Rotary potentiometer (generic)	x 1
	Digilent BNC Oscilloscope x1/x10 Probes (Pair)	x 1
	SMA to BNC Converter	x 1
	Red Pitaya STEMLab 125-10	x 1

Story

SCPI -Standard Commands for Programmable Instruments

First released in 1990
Defines a standard for syntax and commands to use in controlling programmable test and measurement devices, such as automatic test equipment and electronic test equipment.
SCPI commands are ASCII textual strings, which are sent to the instrument over the physical layer (e.g., IEEE-488.1)
It introduced generic commands (such as CONFigure and MEASure) that could be used with any instrument

Toolbox Required

Need to install Instrument Control Toolbox
You can run codes in the live script option

Analog Input

For adetailed explanation watch the video in the end.

Signal Acquisition

Using 555 IC Pulse Generator

Final Video

Code

MATLAB Code

%% Define Red Pitaya as TCP/IP object clear all close all clc IP= '192.168.178.111'; % Input IP of your Red Pitaya... port = 5000; tcpipObj = tcpip(IP, port); tcpipObj.InputBufferSize = 16384*32; %% Open connection with your Red Pitaya fopen(tcpipObj); tcpipObj.Terminator = 'CR/LF'; flushinput(tcpipObj); flushoutput(tcpipObj); % Set decimation vale (sampling rate) in respect to you % acquired signal frequency fprintf(tcpipObj,'ACQ:RST'); fprintf(tcpipObj,'ACQ:DEC 1'); fprintf(tcpipObj,'ACQ:TRIG:LEV 0'); % there is an option to select coupling when using SIGNALlab 250-12 % fprintf(tcpipObj,'ACQ:SOUR1:COUP AC'); % enables AC coupling on channel 1 % by default LOW level gain is selected % fprintf(tcpipObj,'ACQ:SOUR1:GAIN LV'); % user can switch gain using this command % Set trigger delay to 0 samples % 0 samples delay set trigger to center of the buffer % Signal on your graph will have trigger in the center (symmetrical) % Samples from left to the center are samples before trigger % Samples from center to the right are samples after trigger fprintf(tcpipObj,'ACQ:TRIG:DLY 0'); %% Start & Trigg % Trigger source setting must be after ACQ:START % Set trigger to source 1 positive edge fprintf(tcpipObj,'ACQ:START'); % After acquisition is started some time delay is needed in order to acquire fresh samples in to buffer % Here we have used time delay of one second but you can calculate exact value taking in to account buffer % length and smaling rate fprintf(tcpipObj,'ACQ:TRIG CH1_PE'); % Wait for trigger % Until trigger is true wait with acquiring % Be aware of while loop if trigger is not achieved % Ctrl+C will stop code executing in MATLAB while 1 trig_rsp=query(tcpipObj,'ACQ:TRIG:STAT?') if strcmp('TD',trig_rsp(1:2)) % Read only TD break end end % Read data from buffer signal_str=query(tcpipObj,'ACQ:SOUR1:DATA?'); signal_str_2=query(tcpipObj,'ACQ:SOUR2:DATA?'); % Convert values to numbers.% First character in string is “{“ % and 2 latest are empty spaces and last is “}”. signal_num=str2num(signal_str(1,2:length(signal_str)-3)); signal_num_2=str2num(signal_str_2(1,2:length(signal_str_2)-3)); plot(signal_num) hold on plot(signal_num_2,'r') grid on ylabel('Voltage / V') xlabel('samples') fclose(tcpipObj)

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