tabchas

@jippie does that sound correct?

and for the switches to be OFF, I could leave disconnected.

so for the switch that I want ON, I could replace it with a 125 ohm (typical on resistance of the switch) resistor

@jippie the paper says it uses the eight-channel multiplexer ( CD4051B) as the row selection switch

thats the circuit. its supposed to be a row selection circuit for a resistive sensor array

@jippie

wait. can't i just use a resistor that equals the on-resistance of that switch?

ti.com/lit/ds/symlink/cd4051b.pdf

Hey what do you guys do if you can't find a SPICE model? I'm trying to look for this: CD4051B

thanks tho @HariPrasad

i guess its serves its purpose to give you a relative estimation of the market

@HariPrasad ah ok. makes sense. i feel like a lot of these stats pages gives these relative data points

@HariPrasad yep. What do you mean its just for visualization (like its just relative numbers with no real meaning)?

@HariPrasad thank you!

@HariPrasad haha yep. Was tryin to see if someone could help me out :). Would you happen to have any ideas?

it clearly doesn't add up to 61%

Random question but im confused how this works - how do the stats not add up to 100%

it clearly doesnt add up to 61%

like how are they getting 61% from that graph

Random question but im confused how this works - how do the stats not add up to 100%

the sensor is rated at +-5% (not the best sensor ofc)

could it just be the sensor accuracy that's in question? Just trying to see if there is anything on the physics side that i'm not taking into account

and its decreasing slightly over time

readings are about 0.3psi

yea its plugged into an arduino @Sidarth

Since it is reducing gradually, this is a loss of air pressure that could be due to a leak?

@Sidarth not sure. as in I'm really just trying to find out the limitations of air pressure tech (list out problems I find, try to find solutions, etc.) So right now I'm just hooking it up and reading the sensor with no weight applied.

@Sidarth so I have my sensor all hooked up, but am getting some strange results. So ideally, once its sealed, its supposed to show a constant pressure right? But its slightly decreasing over time. Any thoughts/ideas?

@Sidarth haha

@dmckee Curious, why is it bad engineering?

just like if I put a 10lb weight on it, I wanted to see if I could correlate that to air pressure

nothing specific

@Sidarth well its a side project and I wanted to see if I could weigh things accurately using air pressure.

@Sidarth I'm doing an experiment to find how weight correlates to air pressure

@Sidarth so really all I need is a way to calculate the volume of air inside the given air bladder

@Sidarth Hmmmmm, ok that makes sense

@Sidarth Well so what I am asking is given an air bladder of a certain shape and material, how do I calculate the air pressure inside the material (not using a sensor, but with math)? In this case, I'm looking at a silicone tube that has a diameter and length.

well I just wanted to understand a bit about compressed air in tubing

@Sidarth here's the sensor: digikey.com/product-detail/en/MPX5010GP/MPX5010GP-ND/464055

but not sure how to put it all together

I'm assuming the diameter of the tube is needed, as well as the length

@Sidarth how would I go about finding how much air pressure the sensor sees?

@Sidarth I used silicone, kinked it, and put epoxy. But if its easier, we can just assume that I have a silicone pipe, perfectly sealed on one end, and connected to an air pressure sensor on the other

@Danu @skullpetrol Hmm, isn't this more of a physics question? I'm trying to understand how compressed air in a tube works

Thanks in advance!

New guy here, and have a question to pick your brain (freshman in Electrical engineering here). I have a silicone tube and I sealed one end using silicone and epoxy, and connected the other end to an air pressure sensor. How do I calculate the range of air pressures I can get varying different forces on the silicone tubing? Is it P = F/A?