FLL City Shaper Single Motor Challenge Part Two: Drone and Bat with an RCX!
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- เผยแพร่เมื่อ 5 ก.พ. 2025
- In my last video, I demonstrated how a single motor robot could be competitive in the FLL City Shaper challenge. To make things even more interesting, I built an RCX-based robot and have been teaching myself robotc.
For any mission, it is worthwhile to study the motion involved in picking up or placing items where they belong. Lifting the drone is a very basic arc if the pivot point of that arc is in the right place. Likewise, getting the bat to roost in the tree is a matter of observing the motion of the bat when it encounters the tree branch, and building a device to channel that motion.
The key to this year's challenge is - for me - to keep it simple.
The noise made on the outbound leg is the rubber foot of the 'trigger' dragging on the table. The foot is unfortunately off-center, so the tension has to be just right: pushing down too hard causes the bot to go slightly left, push down too little and there is insufficient friction to pull the pin holding back the drone-raising arm.
Three of the accessories I'm building for City Shaper challenge have triggers that rely on backwards motion to activate lego-powered devices (power provided by Lego rubber bands and axles used as torsion bars). The challenge is in designing mechanisms that deliver sufficient drag so the robot can pull back on the trigger without moving the accessory backwards.
Incidentally, this is the most complicated mission from a programming standpoint, requiring the bot to slow when it reaches the tree, and pull away slowly while operating the drone trigger. Or maybe "complicated" is overstating the case!
Also, this mission - as it stands - will not be in the final run of this robot. The drag of the trigger foot induces a slight drift in the trajectory of the robot, and occasionally fails to release immediately upon reversing. Since this robot will be unable to tackle every mission within the 2:30 time frame (there is only so much that a single RCX motor can do!), there are other missions with a much higher success ratio.
The most praise worthy part about this video is that you don't use ev3 or spike prime, but freaking old school RCX
You have my thanks for this video, keep up tge good work, i will now proceed on watching the rest of your channel
Really cool!
Madlad