user10500: I'm using this Dual Motor Shield

when I plug Arduino Dual Motor Shield into Aruino uno can't seen any way to communicate with Adruino uno.how can I communicate with uno ?

user10502: Communicate with what? A PC? The usb serial port should still work fine, and anything connected to the RX/tx pins (D0 and  D1)
If your concern is that there is no longer a socket on the top of this shield that you can plug wires into, well you can solder on some wires to the top of the board, or you could get a screw shield board to go between the arduino and motor shield which would make all the pins available. I have also use small gauage wire wrapped around the shield pins and then just insert the shield onto the arduino making kind of a wire wrap connection between the boards.

10500: <p>I'm using this Dual Motor Shield
<img src="https://i.stack.imgur.com/N5DAh.jpg" alt="L293D Arduino Dual Motor Shield"></p>

<p>when I plug Arduino Dual Motor Shield into Aruino uno can't seen any way to communicate with Adruino uno.how can I communicate with uno ?</p>
 10502: <p>Communicate with what? A PC? The usb serial port should still work fine, and anything connected to the RX/tx pins (D0 and  D1)
If your concern is that there is no longer a socket on the top of this shield that you can plug wires into, well you can solder on some wires to the top of the board, or you could get a screw shield board to go between the arduino and motor shield which would make all the pins available. I have also use small gauage wire wrapped around the shield pins and then just insert the shield onto the arduino making kind of a wire wrap connection between the boards.</p>
