CAN-BUS Shield V1.2 with arduino mega

[tao13]

Hi all.
I use CAN-BUS Shield V1.2 with arduino mega 2560.
If i give power to arduino to usb connector, all works fine but if i try to give the same 5v power to arduino to JACK DC connector the comunication between shield and mega not work. Any ideea please?
Thanks in advance.

[sterretje]

@tao13, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project See About the Installation & Troubleshooting category.

The minimum requirement for the barrel jack is 7V (absolute minimu 6V) , not 5V.

If you want to power the board with 5V, use a cell phone charger and USB or connect the 5V to the 5V pin. In the latter case, you have to disconnect it before connecting to a PC using USB.

[tao13]

Thanks. I 'll try this

[tao13]

Many thanks. i want to use my arduino mega directly in my car. I used there an adapter from 12v to 5v because i use an nextion lcd too and mega don;t have enought power to supply the nextion. if i power the arduino directly with 12v from car wire it will be too hot, I think 12v is too much for mega. other thing is i want to put mega in a place where i have hard access to it and if i want to modify something i must put the usb cable inside.