so I made my first pcb design using easyeda.com and the schematic and pcb link My ground pins are all connected and i gave VCC too in the schematic but it is not shown in the PCB deign is that normal? How can I improve my schematic and hence the PCB design(i have used autorouting for routing in PCB) The PCB I designed is an Arduino mega shield and its mainly used to drive 6 stepper motor and 6 servo motor along with endtops each stepper motor is 12v 1.2A bipolar stepper motor and servo motor is 6v(towerpro) mostly to move along different axis and servos for gripper(hold objects) ICs and parts I have used a4988 stepper motor driver l293d dual h bridge driver for servo arduino mega 2560 power jack to input power some connector pins 4p & 3p connectors updated schematics :
sheet-2 sheet-3


closed as unclear what you're asking by Olin Lathrop, RoyC, uint128_t, Lior Bilia, DoxyLover Apr 28 '18 at 8:41

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    \$\begingroup\$ The link goes to easyeda, but (at least on my phone) it doesn't show any existing design. Make screenshots and post those. \$\endgroup\$ – JRE Apr 19 '18 at 4:33
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    \$\begingroup\$ All of the traces appear to be very thin. This is a motor driver, right? Will the traces carry the needed current? \$\endgroup\$ – JRE Apr 19 '18 at 5:16
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    \$\begingroup\$ You don't have any bypass caps or bulk capacitors on the motor drivers. This design will not work well and probably will not work at all without them. Take a look at the datasheets for the various components you are using and look for the bypass capacitor requirements. \$\endgroup\$ – Dean Franks Apr 19 '18 at 5:22
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    \$\begingroup\$ In the design you linked, there is a 100uF cap on each motor driver, close to the driver and with wide traces, C3, C4, C7, C9, C10. \$\endgroup\$ – Dean Franks Apr 19 '18 at 5:58
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    \$\begingroup\$ I can't tell from your schematics what you are trying to accomplish, please redraw the schematics with part numbers/etc and we'll take another look. A statement of what you are trying to accomplish will also help. \$\endgroup\$ – Dean Franks Apr 19 '18 at 7:52