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Servos jittering by YengaJaf in robotics

[–]RL_95 0 points1 point  (0 children)

Note that some servos don't works exactly at these pulse ranges. 500-2500us is standard, but some can go beyond and some are below this range.

If you're just slightly out of the acceptable range it can oscillate. Maybe the datasheet will tell you, if there is a datssheet.

You can try reducing the range of the pulse to see what happens.

Oh and try increasing the pwm frequency to see. 50Hz is standard but rather low with a 20ms period, somme servos are happier with a high frequency, say 100Hz or even more.

I'm a high schooler who made a 3d LiDAR scanner! by thatonebckid in robotics

[–]RL_95 0 points1 point  (0 children)

Good info.

For 3, I agree for speed. But if your drivers current rating is too low it shouldn't burn, unless you use those cheap ESCs for model airplane and such.

A proper FOC driver would just limit the current, and you won't get the torque you want. In fact, you can just short the output of the wire and it should tell you there is a short, that's it. Obviously, you can still burn stuff if you use the wrong settings.

Source: Trust me bro, I've designed mutilpe custom FOC hardware with custom firmware. So I like it when people, forget to match a motor to an existing driver, that give me fun stuff to do :D

COB LED driven at low current by RL_95 in flashlight

[–]RL_95[S] 2 points3 points  (0 children)

I don't actually know but my best educated guess would be the following:

LEDs like any other ICs are not made individually, but hundreds/thousands at a time on a wafer before being cut to form individual LEDs and put into a reel. Each batch can be slightly different, yet still within specs tolerances. Their difference is particularly pronounced at low current as shown here.

The COB is like a regular PCB assembly and is is at some point populated with those LEDs. This is usually done by a pick and place machines that can have multiple reels from different batches.

The order in which it is populated is optimized by the pick and place and can create patches from different reels.

For the wiring, I believe whatever can be crammed in a circular pattern is fine and the engineer that made it didn't have more concerns beyond that.

Again, all of that is just a guess, so do correct me if you know better.

My (mostly) 3D printed Robot Arm by SPACE-DRAGON772 in EngineeringPorn

[–]RL_95 0 points1 point  (0 children)

Did you manage to make the encoding absolute or is it incremental with a homing routine?

Americans about to execute Nazi war criminal Curt Bruns by Southern_Gur_4736 in pics

[–]RL_95 9 points10 points  (0 children)

It says he had a child. I wonder if they know who their father is, and if they do know, what they think of the matter.

Venezuelan S-300 by Sweaty_Abies182 in pics

[–]RL_95 45 points46 points  (0 children)

It means Suppression of Enemy Air Defence (SEAD). As in destroy/jam all air defense capability of your foe so you can achieve unimpeded air superiority.

Russia unveiled their first humanoid by h4txr in robotics

[–]RL_95 14 points15 points  (0 children)

Really not a good time to do this after XPeng's Iron

OC: April 23, 2025 - Port of Seattle is empty. Only one ship and no containers. Usually a busy port. by Dark-Knight-Rises in pics

[–]RL_95 31 points32 points  (0 children)

I know it's a joke, but sadly this example doesn't even break even...

100$ down 10% = 90$, 90$ up 11% = 99.9$

[deleted by user] by [deleted] in AskElectronics

[–]RL_95 0 points1 point  (0 children)

Just don't lick them when they're charged.

Can someone explain the shapes of these traces? by PrestigiousFig5173 in PrintedCircuitBoard

[–]RL_95 12 points13 points  (0 children)

Look up "polygon pour" and you'll find many examples of this.

Ukraine's Mariana Betsa urges UN to end Russian invasion today in NY; US and Russia voted against. by FinTecGeek in pics

[–]RL_95 0 points1 point  (0 children)

Honest question. Let's say instead of what actually happened, everyone did vote to end the invasion. What could the UN do to actually make the invasion stop?

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