There are several problems with your schematic (and therefore with your PCB). Schematic: 1. You should connect ground nets with either wires (from the Wiring Tools pallette) or a ground symbol. You have joined them with a netflag called d39. Joining them with a netname other than ground is just confusing; 2. You have not connected all the required ground and supply pins on the ARDUINO-MEGA; 3. You have no power supply decoupling capacitors (see [https://easyeda\.com/andyfierman/Power\_supply\_decoupling\_and\_why\_it\_matters\_\-451e18a0d36b4f208394b2a2ff7642c9](https://easyeda.com/andyfierman/Power_supply_decoupling_and_why_it_matters_-451e18a0d36b4f208394b2a2ff7642c9)); 4. You have not used No Connect symbols (the green cross in the Wiring Tools pallette) on the unconnected pins. PCB: 1. You have 3 track to pad DRC errors. Have you clicked on the **Design** button in the left hand panel in the Schematic and PCB Editors to check your design?

For more help on using EasyEDA to reach a successful design outcome, please also see: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f)

@andyfierman thanks for the feedback ...this is my first ever schematic and pcb design No i havent checked for DRC error(actually i didnt know where to look for it) thank you very much for the feedback !!! anymore suggestions are much appreciated

@andyfierman thanks for giving so much information i have a doubt,I am trying to make a shield for arduino mega if i connet No connection to unused pins , can i not use it to connect other components after the PCB is printed?

also i checked my DRC it shows track to pad error ? I used autoroute and i really dont know how to fix the error

i have updated the schematics and pcb and i cannot see any DRC error now so everything clear?