Remote Controlled Excavator
I got the LEGO Excavator a few months ago but the controls on it were way too difficult for my kids to use. Heck I had a hard time remembering what combination the three switches had to be in to make it open/close the claw or raise/lower the arm. I found some videos on youtube where people used a lot of power functions gear to make their excavators remote controllable. The way they did it was cool but I don't own tons of power functions parts so I decided to make mine remote controllable by combining it with my EV3.
The hardest part was figuring out how to control six movements with only four motors. I built a motor multiplexer that uses two motors to control four movements. This is used to control the claw, arm, rotating the platform,etc. I used the other two motors to control the tracks.
It is a big hit with my kids :)
- LDD Instructions - I didn't include instructions for the arm/boom since they are the exact same as the standard 42006. When you build it turn the mux so that it is engaging the gear at the top.
- EV3 Software - There is a program called RunFirst that you need to run one time when you first build the excavator. This program creates a text file that is used to remember where the multiplexer is located. This way if you turn the EV3 off and turn it back on, we know which gear is currently engaged by the mux.