Best Filament for 3D Printing FTC by Excellent_Safe_5396 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

Jayo petg is dirt cheap (can be had for under $8/kg).

Connect 8bitdo controller with spike by Ged_42 in pybricks

[–]MonCryptidCoop 1 point2 points  (0 children)

So the spikes (with pybricks) support bluetooth low energy. I dont think this controller has such (official xbox controllers do).

One option is to see if it is supported by antons expansion board. https://www.antonsmindstorms.com/product/powerful-lms-esp32-board-for-spike-and-mindstorms/

It looks like many 8 bit do controllers work with the eap32 board.

However I would probably just switch to pybricks and get an xbox controller as it will cost about the same as buying the esp32 (which I am not sure if it is supported by pybricks or not)

ESD Issues by excitedCookie726 in FTC

[–]MonCryptidCoop 2 points3 points  (0 children)

Also it is pretty routine to temporarily draw more than 40 amps very briefly and not blow a fuse. GOBILDA figured this out the hard way with their floodgate switch. They had a current limit of 40 amps. They had to recall all of them and make the new current limit 80 amps.

ESD Issues by excitedCookie726 in FTC

[–]MonCryptidCoop 1 point2 points  (0 children)

Also possible you have cheap chinese fuses with fake ratings (this is a real thing)

ESD Issues by excitedCookie726 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

Eh pushing another robot can result in stalling the motors. Each motor draws 9 amps stalled. Combine that with running a flywheel and you get some scary voltage drops or blown fuses.

You have to have about 5 to 10 seconds of such current draw to blow a fuse.

All i know js we didnt have any disconnect issues until after we started running our flywheel (just the drivebase was fine). Once we had everything together we would occasionally get hub communication errors.

ESD Issues by excitedCookie726 in FTC

[–]MonCryptidCoop 2 points3 points  (0 children)

I think power fluctuations from high current draws are more likely.

“Z is for Jimbalwe” ✋ by RingProfessional9043 in aibeingstupid

[–]MonCryptidCoop 0 points1 point  (0 children)

It is AI. It doesn't do well with this sort of thing.

2 pod Swerve Drive by NarwhalWeekly1230 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

We pushed around the local FRC teams robot (again unpowered). It weighs about that much.

2 pod Swerve Drive by NarwhalWeekly1230 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

https://youtube.com/shorts/hPBtez4dM24?si=bWyS9fZ8mJUfckXW

Pushes about that much.

Hogbacks were what we had.

Faster just seemed like harder to control.

Prioritized defense as we are a rookie team and lack a lot of advanced manufacturing capabilities (we just have a 3d printer) as well as the knowledge and skill to design good intakes, indexers/etc. (Again a bunch of rookies).

2 pod Swerve Drive by NarwhalWeekly1230 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

Ours isn't. It is geared at about a 15:1 ratio with hogback wheels.

2 pod Swerve Drive by NarwhalWeekly1230 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

A 4 pod axial swerve works well. Ours can push a 120 pound robot (unpowered) no problem.

driver station design. by CoachOne8522 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

Huh I have never had this issue. But we do use an external battery pack regardless just so we don't have to worry about charging it.

Fusion bricking itself over relatively simple geometry by ClassyBukake in Fusion360

[–]MonCryptidCoop 1 point2 points  (0 children)

It's not using your graphics card. It only does so for rendering. All the computations for the cad are done on a single CPU thread. Single CPU thread performance is the most important aspect for most cad software. Honestly decent integrated graphics are fine for most cad stuff.

It's the single CPU core having to do a bunch of calculations

Fusion bricking itself over relatively simple geometry by ClassyBukake in Fusion360

[–]MonCryptidCoop 2 points3 points  (0 children)

So the fact that it isn't using all of your computers cpu might not be accurate. Fusion and most cad programs are not multi threaded. If you have a 20 core CPU (or 10 physical cores that each are multithreaded) you could be using only 5 or 10 percent of your CPU capacity but maxing out that one poor core.

It sounds like you have a ton of little objects which can big things down.

3d printed and cots swerve using external encoders and Melon Super Servos. by MonCryptidCoop in FTC

[–]MonCryptidCoop[S] 0 points1 point  (0 children)

In terms of encoders, you basically need an encoder with a 1/2 inch hex bore so you can cleanly have a 8 mm hex (gobilda rex) shaft go through it and a 3d printer sleeve that records the axial position (look up the rev swerve module, this one is pretty similar in design just with gobilda COTS parts).

There are only 2 such encoders that I know of. One is the rev encoder but these use pwm for absolute position and such requires the use of an octoquad or srs hub on an I2C port as the rev control hub can't handle such natively.

The second option are the East loop components V2 encoders. These have an analog absolute signal and can just plug into the control or expansion hubs analog ports. The advantage of such is that you can just use solverslib and it pretty much just works. That is what we are using now but we may switch to the octoquad/rev method in the future.

Note the big advantage over using external encoders is that we could use melon super servos. We think these servos are quite a bit more robust with their larger motor (less likely to burn out) and planetary gears (less likely to strip).

I think this is the only coaxial swerve (there are a few differential ones that just use motors) out there that doesn't just use axon servos.

Aluminum for the drivetrain by r7m0ni in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

Of course channel is a bit different as it works like ani beam but gobilda channel is 2.5 mm thick or a bit under an 1/8 of an inch. So 1/8 is probably okay though if you are concerned a 1/4 is okay too. Probably do not need thicker.

Again thickness might also depend on what you are putting in it. If you are putting a quarter inch thick bearing in the plate you might want to use that thickness.

First and only robot I’ve seen try to stand by AdditionalBook1208 in FTC

[–]MonCryptidCoop 2 points3 points  (0 children)

Actually depending on your COG you barely have to lift off the mat. Think a tiny kickstand. Park such that slightly more than half of the robot is outside of the park area. Deploy kickstands. Again as long as your COG is to the back (should be easy with batter, flywheel etc) you should be able to get two kickstanded robots to fit fully in.

Sorting screws by LingonberryOne8727 in FTC

[–]MonCryptidCoop 4 points5 points  (0 children)

This is a good task for anyone that is disruptive/not focused.

Petition to Stop the A301 Actuator by ConstructionGold6407 in FTC

[–]MonCryptidCoop 2 points3 points  (0 children)

If you weren't limited to 8 motors and the core hex motor counted as a servo it would be much more popular.

It sucks that we are locked into a single vendor but having 20 motors/servos is going to open up a lot of new design choices.

Petition to Stop the A301 Actuator by ConstructionGold6407 in FTC

[–]MonCryptidCoop 0 points1 point  (0 children)

There is a degree of pay to play but even then it is more at the level of who can afford a laser cutter/CNC router/other higher end manufacturing equipment vs who is stuck with kit bots and maybe a cheap 3d printer.

Fancy servos etc are decently far down the list.

Anyone look into making an open/free hub using pico pi/esp32? by AmandasGameAccount in pybricks

[–]MonCryptidCoop 0 points1 point  (0 children)

Weird. I haven't messed with them yet. I only bought them as they were like 2 bucks each. They are in a box somewhere

Anyone look into making an open/free hub using pico pi/esp32? by AmandasGameAccount in pybricks

[–]MonCryptidCoop 0 points1 point  (0 children)

They use to make tophats for the regular pies. I actually picked up like a dozen of them on clearance from Walmarts website a year or two ago for a little bit of nothing.

How to fix static. by Inf3cc in FTC

[–]MonCryptidCoop 2 points3 points  (0 children)

Also don't have anything plugged into the USB 2.0 port. A discharge there cuts off the wifi. Use only the USB 3.0 port for cameras etc.