delay for LDR sensor

[Dick]

thanks for the advise. I changed the If into you sugested (what is much better that 5% difference) but the ldr is still logging (10 per second or so).
any Idea?

[mfalkvidd]

@Dick what numbers is it logging?

[Dick]

1 to 100 depends on the light intencity and it changes the value with more and less light.

[mfalkvidd]

@Dick Isn't that what you want?

[Dick]

that is what I want but it continue with logging (> 1000 per minute).So the sensor is very busy with the LDR only. a delay should be the best or your solution of 5% difference.

[mfalkvidd]

@Dick does the number vary wildly even if the same amout of light is shining on the ldr?

[Dick]

no it is steady with the same amount of light, changing it it keeps steady on the new value but with a hi speed logging. , I checked it just now. The LDR is connected to the +5v and A0 with a resister of 10k to gnd.

[mfalkvidd]

@Dick now I see the problem! There are two Serial.println(lightLevel);

Remove the Serial.println(lightLevel); that sits just before the if clause.

[Dick]

YES yes yes, I did not see that one. Your solution is working perfect also with the difference in light (5%).

Thank you for the support and have a nice weekend

[mfalkvidd]

@Dick you're welcome, the same to you
Back to buildning lighting for my wife's makeup mirror :)

[Dick]

good luck and i advice you to do it wll otherwise you have an issue:sweat: