I have a project going where I will need to control a lot of motors remotely. It is not for a robot or competition. It will be a very large model of a tracked crawler crane built from LEGO parts.
A friend of mine pointed me in the direction of VEX and using the Motor Controller 29.
One of the challenges of this project is the high power requirements. I will need to control up to 7 - 8 amps per channel. LEGO makes control equipment for their motors, but their system cannot handle anything more than 1 - 1.5 amps per channel.
QUESTION 1: Can multiple Motor Controller 29 modules be connected to work off one channel? Here is a link to a diagram of the wiring. The situation where the multiple MC29’s are needed is in the crawler base.
QUESTION 2: Will I need to power the MC29’s differently? Ie will the standard plug-n-play wiring that comes with these parts not be sufficient? Please see Option 2 and 3 in this sketch:
Any help or advice will be greatly appreciated. Thank you!
Have you considered other motors than the Lego PF ones? If you have something that needs a lot of power, I’m not sure if they will be enough. From my experience, the control system and battery has enough power to run a few motors under load, and it’s usually the motors that don’t have enough power. You can tell this because when you remove the load, they run normally again.
My design has 9 LEGO PF med. motors powering each side of the crawler tracks. Each motor (within the crawlers) will power a roller that runs on the inside top of the track. This is a bit different than how real crawler treads are powered - usually it’s a big sprocket on the end that is powered.
I’d prefer to keep the project 100% LEGO, but the controls and power options offered by LEGO just aren’t going to do the job.
LEGO makes larger motors (like the XL), but those are so powerful that they’ll twist a plastic LEGO axle apart when stalled. My solution is to distribute the power needed across multiple smaller motors, each with its own gear reduction.
I’ve tested a prototype assembly and the concept works. But I only used a few motors and powered and controlled it with the LEGO PF system parts.
The final model will have many more motors and will need more power (going beyond the capability of the LEGO PF controls).
I’m not sure what type of motor the LEGO PF motors are. I think they were just simple DC motors put into a plastic housing with built-in gear reduction.
I don’t have any NXT stuff. I’ve never messed with it.