# How to create mono phasic square waves with certain amplitude, pulse width and frequency for a certain time period

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Evrim Yilmaz on 11 Jun 2022
Commented: Evrim Yilmaz on 11 Jun 2022
Hi,
I would like to create an output signal for my constant current stimulator. I would like to send square pulses with certain amplitude, pulse width and frequency for a certain time period.
For example: I want to send a pulse train (pulse width = 100µs) for 400ms in 100Hz.
What would be the best approach for this?
Thanks!

Bjorn Gustavsson on 11 Jun 2022
you could use square - for details check the help and documentation of that function.
HTH.
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Evrim Yilmaz on 11 Jun 2022
I got it, silly me.
clc
clear all
SR = 10000; % SR: sampling rate, constant
A = 0.5; % A: amplitude, mAmper
F = 100; % F: frequency, Hz
TW = 0.1; % TW: train width, second
PW = 0.0001; % PW: pulse width, second (50µs)
i = 1;
SW(i) = (TW(i) / F(i))- PW(i); % SW: space width (interpulse duration)
CT(i) = PW(i) + SW(i); % CT: cycle time
DC(i) = (PW(i) / CT(i)) *100; % DC: Duty cycle (% of ON) in a cycle
t = 0:1/SR:TW(i);
y = A(i)*((1 + square(pi*F(i)*t,DC(i)))/2);
plot(t,y)
xlim([0 t(1,end)]) % last element in t
ylim([0 A(i)*1.2]);

R2018b

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