my project is about automatic water sprinkler. i want to use arduino to control timer relay. at the same time i want to control the pressure just using one water sprinkler. i want to make one water sprinkler using timer relay at the first timer it adjust pressure with starter 3 psi.then after 10 seconds the pressure of water increase 6 psi and so on. can anyone help me? i’m very confuse. pleaseeeeeeee 
Not sure if you searched the forum before posting but there are several discussions on this topic including this one:
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