Fischertechnik Liebherr R938 with Bluetooth remote V2

Compared to the first version, I have added driving capabalities. Problem with this build is to keep all on 1 remote. The remote can serve two receivers, but in order to drive the excavator, the boom "up" needs to function also (as otherwise the attachment drags over the floor). Also I wanted the slew to be operating with both receivers. Since it is impossible to connect 1 motor to both receivers (will cause shortcut), I had to separate the slew system, by using a fischertechnik differential. I printed a worm wheel, that fits over the main casing of the differential. By attaching a motor on the left "drive" side, connected to the receiver 1 and the other motor on the other drive shaft, I could incorporate the swing independant of which receiver is active (never both the same are active with this remote). The boom up function, I could simply connect/separate by using diodes, to prevent shortcut.