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Yes, good point, I don’t know what is the impact

Sent: Saturday, March 28, 2020 4:42 PM To: [email protected] Subject: Re: [VentilatorDevelopers] First look, PCB You can certainly do that, but I would remind you that Mr. Farhan has

I believe that is the way it wan done on the schematic I looked at in a earlier post. But, if not, that is certainly a good idea. Also, unlike the uBitx the I2C will be running over longer cable

You can certainly do that, but I would remind you that Mr. Farhan has >three years of experience selling systems using the technique he’s telling you about, and there have been no complaints so far.

I would make the argument to include the level shifters, to be on the safe side, as most of the uBitx applications have been pushing data. When receiving data to the Nano the voltage is just barely in

Asher, thank you for that explanation of the pull ups on the Uno & nano and how to disable them

Running on the edge of spec for 3.3V parts on a 5V system… But ok… Folks have also requested additional analog and digital ports be made available… You can easily add the 10-pin connector from

If you gays are following my suggested UI design I have 3 buttons and a optional on/off switch. Maybe we can have two pins connector to this switch also connected to the forth button in case we decide

Anyone github fluent? I'm not! Would like a volunteer to move the design to github. A recognized personal shortcoming! B

Guess this should go out to the whole group… Sent: Saturday, March 28, 2020 5:04 PM To: 'Gordon Gibby' <docvacuumtubes@...>; 'Sem Lampotang' <SLampotang@...>; 'Ashhar Farhan'

Running on the edge of spec for 3.3V parts on a 5V system… But ok… Folks have also requested additional analog and digital ports be made available… You can easily add the 10-pin connector from

On Uno as well as Nano,. the internal puil-ups are available on all pins except the A6 and A7. For the standard I2C library, they enable the pull-ups to 5v. In the startup code, you an quickly disable

there was a typo in the schematic's text box. i just fixed it. please download again. we really need to move to github now. - f [email protected]> wrote:

The I2C is not needed. The internal pullups can be disabled in the code. We did it with Si5351 and before that with Si570 and other chips. Just the 2.2K resistors to 3.3v are enough.

Attached is the spec sheet for the MPXV7002DP…. I’ll modify the note I just sent out for this part. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Moderator – North

OK… I’ll merge our work… In particular, I2C level translation if not already in yours… Right angle RCA… Just created this:

Bob, Gordon and Gang, Check out https://drive.google.com/drive/folders/12ejpP8crinV61xqQqFtBlNkwgC1asj5j?usp=sharing I have uploaded the schematic and its corresponding PCB layout. It has the

Thought some might find this interesting. https://hackaday.com/2020/03/23/mit-ventilator-designed-with-common-manual-resuscitator-submitted-for-fda-testing/ -- Chip - K9MIT Kokomo, IN

Do you have the specs on the new sensor. What's its part number or where can we get a spec doc? Jack, W8TEE

My virus protection lit up when I clicked on that link!!! I have identified and ordered a sensor that has a built in amplifier… 3.92 kPa and 1.2 Vdc range of signal that will work fine. No extra