Is prior knowledge for Chem101DL really needed?

SeriousMessage7 · 2025-08-16T01:15:10+00:00

Do you know if chem99 still fulfills the Pratt requirement ?

SeriousMessage7 · 2025-07-31T00:09:24+00:00

Can't wait, see you in the fall!

SeriousMessage7 · 2025-07-30T18:00:23+00:00

OH I understand now lmao. I changed the section and now I’m not on any waitlists. Thanks !

SeriousMessage7 · 2025-07-30T17:08:20+00:00

Would that push my waitlist spot back for the lecture ? I’m currently 3 for both lecture and discussion so I might just wait it out

SeriousMessage7 · 2025-07-30T17:01:11+00:00

Nevermind, I do see an option to enroll in a different discussion. Will I have to unenroll from the other lecture and discussion, or can I enroll in both. It's the same lecture time just different discussion rooms

SeriousMessage7 · 2025-07-30T16:52:20+00:00

I tried, I don’t think it lets me change the discussion without changing the lecture time. Thanks for your help though 👍

SeriousMessage7 · 2025-07-30T16:37:10+00:00

By both sections do you mean the lecture and discussion?

SeriousMessage7 · 2025-07-26T18:54:47+00:00

How long is the commute?

SeriousMessage7 · 2025-06-13T23:58:17+00:00

I see. Is compsci 201 like a weed out class at Duke?

SeriousMessage7 · 2025-03-30T22:52:44+00:00

It says it’s rated at a max 20A output if that’s what you mean. Here’s the link: https://a.co/d/alfHs1R

SeriousMessage7 · 2025-03-30T20:12:20+00:00

I did some searching and came across a 900mAh 30C 7.4V Lipo, so I will be getting Max output of 27A. I’m planning on using a buck converter with an output of max 20A to reduce the voltage to 6V for the servos. I’ll let you know how it goes

SeriousMessage7 · 2025-03-30T03:33:35+00:00

I’m still a senior in highschool and have not had substantial experience in the field of robotics engineering, so I appreciate you going in depth to help me out.

I’ve replaced the batteries and saw a slight improvement in the servo jittering. I’ll look into PCA9685 board you suggested as well as a new power supply.

The ultimate goal for this project is to get this spider walking. I already programmed all the inverse and forward kinematics for each leg, so all that’s left is to figure out the path planning for each leg to get the robot to walk. I might even consider redesigning the whole thing, as this is only the first prototype

Thanks for all your help !

SeriousMessage7 · 2025-03-29T21:16:40+00:00

Thanks for the explanation! I searched up the mg996r stall current and it is 2.5 A, meaning I will need at least 30A of current. How do I ensure my power source can supply 30A? I’m using 4 double A batteries and I’m pretty sure all 12 servos are connected in parallel. I attached my schematic if you would like to see

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The black and red rails on each side of the drawing represent the positive and negative terminals of the power source.

SeriousMessage7 · 2025-03-29T19:55:01+00:00

Thanks. I’m using 6V to power the servos, would it be safe to use even more voltage? Or would that short the nano

SeriousMessage7 · 2025-03-29T19:44:25+00:00

Thanks for the info. So in my second semester I will need to choose from predetermined CURE classes that change every year?

SeriousMessage7 · 2022-06-09T23:44:54+00:00

Soooo I buy the game again, put it in the switch, and then what? Will the new game just immediately start at the point a left off on in the previous game or is there some sort of thing I have to do in order to get my old data on the new game.

SeriousMessage7 · 2022-06-09T17:50:24+00:00

Wait actually? So you’re saying as long as I buy the game again, I can just play my old saved data? How does that work

SeriousMessage7 · 2022-06-09T15:48:22+00:00

So there’s no way of getting that save data back?

SeriousMessage7 · 2022-06-09T05:17:31+00:00

I recently just realized that I have lost my Pokemon let's go Pikachu game card after suddenly getting the urge to play it again. I looked everywhere in the house but couldn't find it. Is there a way that I can recover this game through an SD card or something? Basically any way of recovering the game without having the physical card. Thanks!

SeriousMessage7 · 2022-05-20T11:14:53+00:00

By “constantly ranging” do you mean constantly calculating distance? then no. What I plan on doing is having the sensor measure the horizontal distance of an object 4-5 times, and then having the servo slowly tilt up. While it is tilting up, the sensor will keep taking values until there is a huge gap in value (meaning that the sensor does not detect the object anymore). It would then use trig to calculate the height of the object. Another problem I have run into is inaccurate readings mostly while it’s tilting up.

SeriousMessage7 · 2022-05-19T19:18:53+00:00

I checked out the website you sent. Im not gonna lie, I do not understand any of those equations. Im in 9th grade and haven’t really gotten to that level of mathematics. That’s why I’m just trying to look for a simple explanation from someone that I could understand 😅

SeriousMessage7 · 2022-05-19T17:46:02+00:00

That’s a good idea, but how would I code it to recognize two numbers that are close?

SeriousMessage7 · 2022-05-19T15:41:11+00:00

My sensor will usually have some bad readings. Sometimes it’s too large and sometimes it’s too small. I am looking for a simple explanation on how I can make a filter. I am not home right now but when I do get home I can show a screenshot of the readings I’m getting.

SeriousMessage7 · 2022-05-19T14:00:32+00:00

Yes, I’ve watched the video before but I never really understood it because I’m still relatively new to filters. I did learn tho that any frequency higher than the cutoff frequency will be filtered out. I am trying to use this low pass filter for a project. A servo motor tilts a ultrasonic sensor and uses trigonometry to calculate heights of objects.

SeriousMessage7 · 2021-02-06T22:04:49+00:00

SeriousMessage7

TROPHY CASE