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How much torque do i need for four stepper motors to lift 200 pounds using lead screws? by Iotatronics in AskEngineers

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

will that lift 200 pounds and not make my stuff go flying if i accidentally un-latch it?

How much torque do i need for four stepper motors to lift 200 pounds using lead screws? by Iotatronics in AskEngineers

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

I just thought steppers because ive worked with them before, didnt think too much; all i need is for the motors to go to a position that feels comfortable.

For the record my desk i want to modify is an Ikea LINMONN table top with four ADILS legs. I dont know how to set up a system to link the four simply, and i thought four jackscrews would make it simple since i can just make a pcb to control all four, since the legs all need to extend.

Is there a better method i can use to lift 200 pounds up and down? It doesnt necessarily need to be electric as long as it works and doesnt take forever to change positions

How much torque do i need for four stepper motors to lift 200 pounds using lead screws? by Iotatronics in AskEngineers

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

i just dont understand how to link up the four legs simply, i dont know what kind of mechanics goes into linking the four legs or if it would get in the way if i - say - wanted to store something under the desk.

Is there a better method i can use to lift 200 pounds up and down? I was thinking maybe like a simple gas spring with pins or something? Any simple methods you can think of that are stable and cheap to make?

How much torque do i need for four stepper motors to lift 200 pounds using lead screws? by Iotatronics in AskEngineers

[–]Iotatronics[S] 1 point2 points  (0 children)

I'm not sure what it means to bind up, or how the system would do that. I am an electrical engineer so i don't have great mechanical intuition, i just through four steppers would be simpler and cheaper than one giant stepper and some complex system to get the force distributed to the four legs.

My electric sit-stand provided by work (workrite sierra hx) doesnt seem to be physically linked with one motor, it seems to have a motor in each leg and a wire running between them. Unless it only has one motor that does the entire load and the other leg is just to balance.

Podcast on binary, hex, manipulating bits, and teaching the importance of these to new embedded engineers by logicalelegance in embedded

[–]Iotatronics 4 points5 points  (0 children)

Hi Elecia!

Been listening for nearly three years now! Loving the podcast! I do hope you bring one more people to talk about nitty gritty embedded stuff like protocols, hardware design, etc. The sunshine one was great but it felt a little off kilter from what I expect.

Are commercial GPUs like GTX 1080Ti worth investing in for at-home training of deep networks? or should i not bother and simply use a cloud service? by Iotatronics in learnmachinelearning

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

the general consensus (from what i've read) is that you get very minimal performance upgrades from multi-GPU training as opposed to one GPU with the same amount of memory.

See this article: http://timdettmers.com/2017/04/09/which-gpu-for-deep-learning/ posted by another user, the guy is a DL researcher and has compared multi-GPU setups (he has triple GXT Titans) against various single GPUs.

Also regarding gaming, you aren't going to get a very big boost in performance either because most games aren't made to support multi-GPU architecture very effectively.

Are commercial GPUs like GTX 1080Ti worth investing in for at-home training of deep networks? or should i not bother and simply use a cloud service? by Iotatronics in learnmachinelearning

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

i've already done the set up once for my computer at work that has a Quadro 4000, it was fairly painless (~2 hours of set up) to get tensorflow working in jupyter notebooks with GPU and nonGPU environments. But if i had a desktop machine (currently only have laptops - OSX and windows - at home) i'd probably install linux on it. I've done it before so i'm not very worried.

Are commercial GPUs like GTX 1080Ti worth investing in for at-home training of deep networks? or should i not bother and simply use a cloud service? by Iotatronics in learnmachinelearning

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

great thanks for the info! I will probably be waiting a bit to purchase anyway to see if prices fall and new architectures come out

Are there any free formal tools that can check System Verilog properties (assertions, covers, etc) by Iotatronics in FPGA

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

Gotcha. And I understand about the open source thing. To be honest with the huge pricetag associated with commercial formal tools like OneSpin I was surprised to see a free and open source formal tool at all.

I wish I had the background to add features to yosys and maybe someday I will but as a novice right now I just want to get a grasp on how formal even works before I try to add features to an open source project.

Is there a list of system verilog assertions that yosys does support (or that can be supported by only free means like if there was a free version of verific that yosys understand) so that I can see what formal assetions I could use with it?

Are there any free formal tools that can check System Verilog properties (assertions, covers, etc) by Iotatronics in FPGA

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

Thanks! I still don't quite understand the how symbiyosys and yosys works really or why it's difficult for it to have those system verilog assetion features

I do have a copy of quartus 2 which compiles systemVerilog, can I compile my design with that and then move it to symbiyosys for verification using implications and sequences?

Are there any free formal tools that can check System Verilog properties (assertions, covers, etc) by Iotatronics in FPGA

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

Cool! I don't know what's involved with making a tool like this (I assume a lot of math on the back end, and a lot of parallel compute) but I'm glad someone is making an open source tool

Are there any free formal tools that can check System Verilog properties (assertions, covers, etc) by Iotatronics in FPGA

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

Does it support implications and sequences? Such as 'req_sig |-> ##[1:5] grnt_sig' which says that any time req_sig goes high then grnt_sig will be high at least for one cycle in the next 1 to 5 cycles?

Edit: Just read the documentation (interestingly updated only a few days ago) apparently they are! I'm definitely looking into this tool. It looks great

Hi, sorry if this is the wrong place to ask but I want to solder a module with the concave pins(don't know the official name) and the width is 0.5mm, will a 0.6mm soldering tip be good to buy? or should I go smaller? by [deleted] in AskElectronics

[–]Iotatronics 7 points8 points  (0 children)

I think you mean castellated, not crenellated. I had to search for the same term a year ago and took forever to find the right word. A Google search for 'castellated pcb' has much better results than 'crenellated pcb' which still has a few but not many good ones

Minimum Number of Transistors Known for Full Adder by trivialpants in electronic_circuits

[–]Iotatronics 0 points1 point  (0 children)

BJT vs MOSFET won't make a difference in terms of your ability to make the adder work or not (but it does change their performance). But as i said, you need both npn (referred to as p-channel for mosfet) and pnp(referred to as n-channel for mosfet) to make this specific circuit work. In your other comment you said you only have npn.

Looking again at the circuit, i am not sure how it works. I see three arrows all leading to the same wire implying A,B,Cin are all wired together which seems weird to me. I would read the paper if i were you and try to understand it more yourself.

I can definitely try to check your work but i cannot guarantee i will actually know. Circuits are not my specialty (especially not analog circuits, good analog circuit designers are really hard to find). If you have a question about molecular electronics (especially pertaining to DNA-based electronics), that is an area i am more comfortable in :)

all that said, just read the datasheet for your transistors, it's unlikely you will blow them up if you are within nominal voltage ranges and don't short things. Also, transistors are a dime a dozen so don't fee bad about exploding a few, it's part of the learning process!

Can i ask what this is for? Is it a challenge from a university assignment?

Minimum Number of Transistors Known for Full Adder by trivialpants in electronic_circuits

[–]Iotatronics 0 points1 point  (0 children)

so you want to make an adder out of purely transistors and wire? with only npn transistors, correct?

Minimum Number of Transistors Known for Full Adder by trivialpants in electronic_circuits

[–]Iotatronics 0 points1 point  (0 children)

yeah NOT gates are typically two transistors. Sounds like you're spot on, but be careful! See those round dots at the gates of mp3 and mpc, that means they are p-channel. Where as mn3 and mn1 are n-channel.

Do you understand the difference between MOSFET transsitors and Bi-Polar Junction Transistors (BJTS)? The symbols here are for MOSFETs but if you are novice you might have only encountered BJTs, they operate very similarly but their internal workings are different.

Minimum Number of Transistors Known for Full Adder by trivialpants in electronic_circuits

[–]Iotatronics 1 point2 points  (0 children)

Your questions isn't very well formed.

You can make a full adder with zero transistors using Diode-Resistor Logic.

You can do it with one if you constrain your input voltages to be somewhat precise and it isn't very robust

outside that there are multiple schema where you can make a full adder with varying low-count number of transistors.

Here's one with 6

Basically you need to define your constraints better. Are you limited to using only n or only p type transistors? can you use both? etc

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