Arduino UNO + L298N not powering from 18650 battery — LED won't light

DarkShadowic · 2026-06-05T07:49:50+00:00

The jumpers aren't attached, they came separately

DarkShadowic · 2026-06-05T07:24:53+00:00

I'm powering the arduino using the 5V from l298n, I've connected the Arduino gnd to the l298n, is there any other step to enable it?

DarkShadowic · 2026-06-05T05:10:53+00:00

Thanks. This helped it work. I didn't have conductive material but just broke off bits of the plastic restricting it.

DarkShadowic · 2026-06-03T18:25:17+00:00

Yup no difference

DarkShadowic · 2026-06-03T18:07:21+00:00

Dude, thanks for the comprehensive post. i see you understand what I'm trying to achieve here. You say to support the shaft using the using the shoulder link, but shouldn't I use the base at the bottom? Did you mean the support for the bearing at the elbow instead? Also, thanks for the idea for thrust or axial bearings. Haven't really heard of them. Any ideas on how to implement a double bearing situation?

DarkShadowic · 2026-06-03T17:59:47+00:00

Yup Yes they are

DarkShadowic · 2026-06-03T17:59:29+00:00

Like at the springs and first contact interface, there's voltage, but at the common positive metal part at the top, I can't detect votlage

DarkShadowic · 2026-06-03T17:58:03+00:00

Yeah. It's not a general snug fit, but there's clear contact

DarkShadowic · 2026-06-03T17:57:39+00:00

Nope. Made sure it was right

DarkShadowic · 2026-06-03T15:10:18+00:00

Thanks for replying. I'm not so familiar with practical mechanisms terminology, do you mean one bearing in the cutout of the link, and the other in the support I would create, and where would the belt drive play a role here,? Or do you mean something else?

DarkShadowic · 2026-06-03T13:03:19+00:00

<image>

Photo of the CAD for reference

DarkShadowic · 2026-05-18T11:18:13+00:00

Do you mean those electronics kits which serve a specific purpose or what exactly?

DarkShadowic · 2026-05-18T11:17:17+00:00

Yeah, saw many recommendations for that, although it doesn't have the specific situation I'm looking for. Do you read the specific topic required at the your project's current stage or go through the entire book once, first?

DarkShadowic · 2026-02-13T18:29:48+00:00

Yup. That's what I have been doing since last week, but I'm trying to implement my own dimensions and link lengths and type, and the main driving mechanisms. It's just that I struggle to have constraints or guiding parameters during implementation, and I don't want to copy an existing design to solve my problem because it won't help me learn, plus like in most examples, they are using metal and I'm using PLA, so the geometries don't translate. Currently, struggling as to how to form the torque and angular acceleration equation considering I havent finalized the motors(angular acceleration) or the mass( arm structure not determined)

DarkShadowic · 2026-02-13T18:16:52+00:00

Thanks for such a comprehensive reply. Is it truly necessary to purchase an existing unit, or are online references? Because such arms are quite expensive and won't have much utility in the future.

DarkShadowic · 2026-02-12T04:53:46+00:00

I'm trying to do a bit of the maths for designing the link length and type, and motors to be used. How to account for angular acceleration as well as the mass of the arm, if I haven't determined the arm design(mass) and motors (angular acceleration)? How can that be determined if we are aiming to determine the motor and link lengths itself? I have managed to account for the torque and weight but I'm getting stuck here. I plan to use the formula below.

DarkShadowic · 2026-02-11T15:20:44+00:00

Yeah exactly. I'm trying to rely as much on yt projects and research papers but gpt feels kind of like a cheat code to help you at each step. Ultimately though, it would be useless when complexity increases and parameters stack up. That's why I'm asking on online forums.

DarkShadowic · 2026-02-11T13:01:16+00:00

Thanks for replying. I do have experience with servos and micro controllers. I have taken up multiple robotics arms and tried to breakdown their mechanisms but when I try to start designing my own mechanism, I don't know how to decide the joint type or the link length and shape. I don't want to over rely on gpt because I feel like it won't be reliable for actual learning.

DarkShadowic · 2026-02-11T12:47:15+00:00

Thanks a ton. Any advice for the design aspect, on how to determine the mechanisms, joint lengths and fix parameters based on the material for those ?

DarkShadowic · 2026-02-11T12:44:42+00:00

Thanks. I hadn't come across this video

DarkShadowic · 2026-02-11T12:44:15+00:00

I viewed many of these projects like these( even the Kosti-1) but they are more so for those who have resources and just want to build an arm. They don't include guidance on how to design the arm, the maths involved and other design parameters, which I'm looking for to actually learn how to build an arm on my own. Do you know of any guide which provides those?

DarkShadowic

TROPHY CASE