need help making a loop URGENT

if x>=3.3
    disp('signal recevied soil is dry time to water')
writeDigitalPin(a,'D2',1);pause(0.2);writeDigitalPin(a,'D2',0); 
elseif x>=2.9
    disp('signal received soil is wet but not wet enough time to water')
writeDigitalPin(a,'D2',1);pause(0.2);writeDigitalPin(a,'D2',0); 
else 
    disp('signal received soil is wet')
end

i have a moisture sensor the value of the sensor is x i have a water pump that turns on if the x>=3.3 or when x>=2.9 the x value well decrease the x value i want to make a loop that keeps running this if statement until the x value is <2.9 how do i do it

thanks in advance

[Payaam Khalid]

i meant to say the pump well decrease the x value the pump is the writedigitalpin(a,'D2')

[Jan]

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Answer 1

[Florian Bidaud]

while x>= 2.9
    % run your script
end