Reverse the order of the ultrasonic pins (w.r.t. V2) so that the ultrasonic can be put in the socket and faces forward.
Add a three-pin socket for an IR remote detector (e.g., https://www.pololu.com/product/2462). Would need to go to a digital pin with an external interrupt. (I used pin 34 to test, but that is reserved for the servo feedback, yes?)
Reverse the order of the ultrasonic pins (w.r.t. V2) so that the ultrasonic can be put in the socket and faces forward.
Add a three-pin socket for an IR remote detector (e.g., https://www.pololu.com/product/2462). Would need to go to a digital pin with an external interrupt. (I used pin 34 to test, but that is reserved for the servo feedback, yes?)