开云体育

All:

Farhan: I have started a new group for us that can be accessed at:

VentilatorDevelopers groups.io Group

VentilatorDevelopers groups.io Group This is a group of volunteers who are working together to develop an inexpensive ventilator that can easily cons...

Not the sexiest group name, but it does say who we are and what we're doing.

I will isolate the display interface as much as I can using the I2C interface. I also suggest that input prompts be isolated for "one-place" translation. I think the 4x20 is nice, but expensive and perhaps not too easy to find. I think I need to write the code using the lowest common denominator: 2x16. I have both. Opinions?

I also think there should be one encoder for use changing numbers and a "Menu Select" NO button that can be used to advance through menu selections and exit the option when the selection is made. The encoder would replace Marcelo's Up/Down buttons. Opinions?

Jack, W8TEE

On Tuesday, March 24, 2020, 7:06:03 AM EDT, Ashhar Farhan <farhanbox@...> wrote:

Gentlemen,

We need to think in terms of component availability as well. The I2C display is most difficult of the options that we have. The 16x2 LCD display is the most common (with 4 bit parallel interface), followed by 20x4 LCD (interface).?

Jack, will you take care to wrap the display routines so we can switch the display type?

Sam, what kind of connector will you have between the controller and the pressure gauge? The pressure gauge will be inside the pressured space and we will need to bring the wires out. As the pressure differential is not much, we can make do with some kind of sealed connector. Given the low pressure differential, I would imagine that a 9 pin (RS-232 kind of) connecto should work. We can bring out A5, A5, Ground and?+5v. This will allow us to use either analog or I2C sensor.?

Sam, we will also need a battery backup. I would strongly suggest a sealed lead acid batter. it has a long life and it can withstand bad charging methods. Or we can use NiCad cells, your call (I strongly oppose LiPo as they are a hazard)

Lemme? know these decisions and I will build them into the box.

- Farhan

On Tue, Mar 24, 2020 at 2:16 PM Ashhar Farhan via Groups.Io <farhanbox=[email protected]> wrote:

I vote to moving these discussions to a separate group. Jack, will you be able to create a new group? It is best to take this discussion into that.

- f

On Tue, Mar 24, 2020 at 12:45 PM Ken Hansen <ken@...> wrote:

Jerry,

It's not that big a problem for me, I have no need to try and force my opinion on others - I simply shared my opinion, and when challenged, I responded.

As I said, I'm just one of 7,833 members of this group - my opinion only represents 1/7,833 of the members.

Thanks,

Ken, N2VIP

> On Mar 23, 2020, at 9:53 PM, Jerry Gaffke via Groups.Io <jgaffke=[email protected]> wrote:
>
> Your best bet is convince the forum moderator, that would be Arv:

Gordon:

I didn't have the right flag set for moderation. I have "unmoderated" everyone, so if something bad goes through, that's the reason.

Jack, W8TEE

On Tuesday, March 24, 2020, 1:02:10 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:

Jack, are you the moderator?? ?My posts are waiting for moderator approval...
Thanks!
Gordon

THANK YOU GUYS for working on this.??

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Jack, W8TEE