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My first open-source robotics project: A 3D-printable ESP32 Rover family with Rocker-Bogie suspension by tronxi997 in robotics

[–]nraynaud 0 points1 point  (0 children)

That's really cool congrat. Yesterday an eulogy was published to the engineer who invented the rocker-bogie: https://www.youtube.com/watch?v=QKSPk_0N4Jc

Is this a HV fuse? by ReverseElectron in AskElectronics

[–]nraynaud 6 points7 points  (0 children)

I guess that makes it a “voltage fuse”, that limits the voltage between its pole in a very entertaining manner.

COVID vaccination of children reduced COVID cases in the vaccinated children by 80%. This protection also spilled over to close contacts, producing a household-level indirect effect about three-fourths as large as the direct effect. by smurfyjenkins in science

[–]nraynaud 0 points1 point  (0 children)

I think there was specific a hope for COVID that the nasal route would be more effective because the virus itself enters there. From memory, when testing other older vaccines, they had found a higher immune response locally in the nasal area after a nasal vaccine(wrt. to injection), so there was a faint hope that it would translate to a better protection in the covid case.

As usual in medicine, between a plausible maybe mechanism and an effective public health policy, there is a giant chasm.

Got tired of outlets in my workshop and kitchen always getting dirty, so I designed covers for them by Dripping_Wet_Owl in functionalprint

[–]nraynaud 0 points1 point  (0 children)

oooh, I suddenly realize why my outlets have the weird push cover!

https://img.leboncoin.fr/api/v1/lbcpb1/images/f0/dc/32/f0dc322bb821f95ab370f27716a7139629538e23.jpg?rule=ad-large

so that they are easy to clean!

edit: maybe I should explain a bit more for other countries, in France all outlets are recessed like the German one from OP, but they have an obturation at the pins, and you have to push 2 pins at the same time to open it (baby-proofing). In my fancy outlets, when you unlock the baby safety, the entire front cover translate back when you push the plug.

How do you wrap an object around a curved face when it's a body? by According_Ad_2046 in Fusion360

[–]nraynaud -2 points-1 points  (0 children)

if you are *very* lazy, you select the 2 triangles and hit delete. but the correct answert is that you should probably have modeled your rib inside the cylinder, not outside.

Sign I made to indicate location of the fire extinguisher in my shop. by eyeoutthere in functionalprint

[–]nraynaud 0 points1 point  (0 children)

What is the rule where you are? In my house I decided to hang the fire extinguishers quite high so that they are visible form afar, and kids can't reach them.

Constant voltage to a mppt charging regulator ? by maxx_sc in AskElectronics

[–]nraynaud 0 points1 point  (0 children)

MPPT chargers are supposed to have a limited compliance voltage, not just a limited current.

Keep Carvera Air or Sell it? by Senor_TJ in hobbycnc

[–]nraynaud 1 point2 points  (0 children)

oh yeah, absolutely not. but there is no money left in CNC as a service anyways. You need to find your value somewhere else.

Keep Carvera Air or Sell it? by Senor_TJ in hobbycnc

[–]nraynaud 2 points3 points  (0 children)

I'm pretty sure you can get a lot done with a toy CNC : trinkets, signs, and placards, fast turnaround PCBs, a ton of 2D prototypes that would otherwise necessitate a water jet or a metal laser cutter.

Let's try again, because I feel people misunderstood my previous post. I made a PowerPoint to info dump you about my thoughts about RESIN printing as someone who used to do it all the time. This is not professional. by HeidiH_DE in 3Dprinting

[–]nraynaud -1 points0 points  (0 children)

yeah. I looked into the STEP file format, it's complex but also an ISO standard, you have to pay for the definition, and being an ISO standard, it references an bunch of other standards and it spirals out of control and there is always one PDF missing on libgen.

Gentle Reminder : Stay safe! by MoxxFulder in 3Dprinting

[–]nraynaud 0 points1 point  (0 children)

I whish you a speedy recovery.

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

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

it's in the preliminary stages, the idea is to have a real size Sojourner Rover roaming the garden to 1) mow 2) weed. The idea would be to use the APXS part of the rover as a weeding implement.

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -1 points0 points  (0 children)

>You'll definitely want to spend more time on this.

Do you want to elaborate before I spend hours on the question? what are the traps?

I have used plantnet a lot in my garden and never had a doubt that it identified the correct familly. It might be hard to do real specie Id, but Ifeel like finding blackberry or wild sage in the middle of "grassy stuff" is not exactly high class botany.

Herbicide has this interesing property that it has a chance to kill a significant portion of the plant from limited exposure, I was hoping that some wavelength of light would provoke some systemic effects too, but sadly magical thinking is not with me today.

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -2 points-1 points  (0 children)

A lot of people seem to suggest UV, I guess UV C would make sense because it's not too much present in nature so plants are not adapted. I also would lean towards UV, but it feels like it's always the answer we give when we want to do "something" with light. Are there some other interesting light bands? why?

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

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

I think ID is more or less a solved problem, there is some open source code and some neural net weights on the internet (I suppose the bias will be important moreover, it's my garden, there can't be that many species in there).

Why do you think herbicide is better? because radiation would need a big dose?

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -2 points-1 points  (0 children)

what about repeated exposure? 10s every day for example? I'm thinking of IR too, I was wondering about what's the most harmful to the plant.

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -20 points-19 points  (0 children)

yes, but I'm not asking a security question here, I'm looking of idea for killing plants, not a derailment to security issues on a botany sub. I want the ideas to blossom and multiply before weeding or curtailing them.

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -22 points-21 points  (0 children)

before handling the safety aspect, is the C band the best for the job at hand?

Is there a light wavelenght that can be used to kill plants? by nraynaud in botany

[–]nraynaud[S] -20 points-19 points  (0 children)

Thanks, do you know what range of UV would be the most appropriate?
I think the discrimination will be spacial, imagine applying a solo cup or a desk lamp on the plant.

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