Hello everyone ,
I’m trying to make a weather station with a mega board. For the moment the code seems to work but I have a problem with electronics.
Before the arduino goes into the sleep mode, it shutdowns my lcd screen and my temperature sensor with a relay.
But when the relay is open , my lcd LED still brights and I don’t understand why. It brights lower than when the relay is close , but still. And I want to save energy when the arduino is sleeping.
It is the same for my temperature sensor , its LED still brights a little.
I’ve tested all the components individually, and everything seems to be ok . But when connected, they are still supplied with voltage whereas the relay is open.
I put in attachement my circuit, it’s quite a mess and I’m a sorry . My relay commute the ground for the right part of the breadboard. Can you see any anomalies ?
My guess is that the voltage from the digitals ports supplies the LED of the lcd , but I’m not very sure.
If you have any idea ideas it will helps me a lot ! Thanks everyone