I did a project right here to a device that control 3 sensors and it will be used in the railroads of my city.
I just have one trouble with that, when i plug my arduino UNO on PC it is working pretty fine on the board, but this project is for railroads and I need it to work with bateries. My batery system is working because the red light of my arduino uno turns on but anyother thing happen. I mean my display does not turns on and even my sensors.
Does arduino have any problem when you use an external feed ? Is there anything that I can do to fix that ? Anyone else had that problem ?
Thanks so much for your attencion and I ll be glad for any help that you can provide.