I am making an RC car , have combined the Arduino UNO R3 with the AR 293d, and pluged in the HC-SR04 sensor to the SRO4 hole at the left top corner in the below graph. However, besides one sensor I would like to add three more HC-SR04 sensor.
The problems are
1) is the board sufficient to plug three more sensor ?
2) or what extra board I need if not sufficient and how to combine those board
2) also, can I plug in other hole?
Thanks for helping
Update: breadboard connection
So I have to get a stuff like this?
and one more question, sorry for begin newbie, there are many holes on breadboard, which hole I should connect those three sensor on it, and the hold I should connect the breadboard with the AR-293D board?
And for programming, is there any way to get the pin at the breadboard as I have read some program before, the pin is assign with a number?
Thanks again for helping.