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This is a little difficult given the lack of context to the code. I'm assuming the outputs 3,5 & 6 are in relation to RGB color. If not disregard this message. I don't see how you would add intensity based on the pressure sensor unless it is saying pin 3 determines power. IF that is the case we want to tie that to valuer1 and I would have to have more info on how the colors are determined.
I rewrote the loop for what I think would give you a random changing light every second, but without more information on the board with regard to setting intensity, I can't help you there.
void loop() {
valeur1 = analogRead(A0);
delay(1000);
valeur2 = (200 / valeur1); //need context on what these are for
valeur3 = (valeur2 * valeur2); //need context on what these are for
valeur4 = random(255); // three random values. One for each RGB. If you use only one you will be limited to 255 colors.
valeur5 = random(255);
valeur6 = random(255);
analogWrite(3,valeur4);
analogWrite(5,valeur5);
analogWrite(6,valeur6);
}
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