There is only one 5v pin in the arduino. I am obliged to use an outside power source to supply my sensor.
The problems is that when i use the outside power source, the sensor connected to that do not function well. The value readings are very high and unconsistent, but when i switch and use the 5v pin from the arduino, it works fine.
How can I use an outside power source?
This also happen When I use LCD. If I use an outside power source, it doesnt lit the text.