These are the circuits on the wall sensor PCB
Below are the circuit that drive the LEDs. On the left, the circuit for the two diagonal side wall facing LEDs and on the right the circuit for the single forward facing LED
These are the sensors that detect the light coming back from the walls
These are the 3 indicator LEDs that can be used as you wish e.g. for showing if if wall is detected on each sensor
This shows the connector to the mezzanine board and the power smoothing circuit
