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Sorry for the last message... I can't type... Note my reply #505 includes zipped files with the level translator and a few other features implemented... Might make it easier to add these to the

Please see my rep[ly #505 earlier in this thread... repeating much of htat her, plus a couple more points and a bit more clarification of my concerns. I consider I2C level translation a critical

Yes. We have 12 of this part: https://www.digikey.com/product-detail/en/nxp-usa-inc/MP3V5010DP/MP3V5010DP-ND/2186183 in our clutches in Gainesville Fl. Thanks, Gordon

Trying once again: consider implementing an oscillator with that OA or replace it by a 555 or by the already suggested buzzers. thanks

Sure. Do you have a 10 kPa part in mind or should I pick one? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

Thanks Ashar.? ?I may not have the most recent schematic. I don't have KICAD so I worked from the color PDF of the board. I checked? everything that I possibly understood how to check, and my

It was really good information for everyone, none the less. Tom, wb6b

AMBIENT PRESSURE SENSOR BOSCH BMP280. Explanation of code to read it (does not explain how to WIRE IT) See attached sketch.

Hi Tom, I was responding to this from Marcello… I2C drivers are open drain (or Open collector) as many slaves and master drive the data signal. pullups are required (maybe interval are good enough).

Very good. Thanks...

These are useful reference papers if you’re working with I2C… some math behind pull-up resistor values, how to level translate an I2C bus… I2C level translation:

The better signal margin could provide some additional noise immunity and help with added capacitance when dealing with longer cable lengths. May need to keep the I2C clock frequency at the lower

OK… some pcb/schematic revisions… 4 x 20 LCD footprint applied to Ashhar’s pcb… This is the display Ashhar had referenced on the datasheet link for the lcd component in his schematic. The 4x20

Great plan!

Tom, you bring up a good point. Using a variety of different sensors. I can put together a chart that shows sensor model, required voltage, required orifice dimensions, PTFCC constant, and pressure

There’s already a Github repo for the project with the design docs, code and some mechanical&PCB design on it. The Realization branch seems to have the most recent work. Checkout

Can you repeat the design for the 10 kPa version which is another popular version? some people may have one part some may have another.

Here is the quick version of that link. My Mac did not see a virus, hopefully it was not in error. Basically it was a LM358 op-amp circuit for an inexpensive strain gauge pressure sensor. Amazon said

The last parts of the flow meter are the PTFCC value and the orifice that needs to go in the pipe. PTFCC = 63.639 liters/(min-kPa) <-- PUT THIS IN THE ARDUINO FOR CONSTANT PTFCC And a washer needs to

I2C drivers are open drain (or Open collector) as many slaves and master drive the data signal. pullups are required (maybe interval are good enough). I would guess that most I2C interfaces work fine