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Right after I got the ambient pressure sensor working, the nice folks at AMAZON dropped off a 2kPa differential pressure transducer with analog output on my doorstep!? Thank goodness they are still

I don't know if that will be a significant concern or not. Certainly we don't want SPARKS in the airway, but nothing in what we have done would raise that concern. Most of the usage will be at 60% or

Hi, One question. As the valves and such are not specifically designed for O2, is there a maximum O2 enrichment percentage we may need to consider in this design. My welding gauges and regulators

Art, we have to choose connectorr that are available, above all, and preferably in most of the world. - f

I've read the FDA Enforcement Discretion Guidance and the Emergency Use Authorization. The EUA defines specs via ISO standards that don't have access to (and don't want to buy!). Can you share the

CAUTION to any following along:? ?You cannot connect the BARE BMP280 to an Arduino UNO board --- it will put too much voltage on the 3.3V limited I2C lines of the bare BMP.? ?Most of you will be

Do you really think they're secure enough (won't pull out unexpectedly)? I thought there was a preference for a locking type connector. There are PCB mounted DIN connectors available. -- Art Greenberg

Yeah wrote:

Should we need a op-amp here is a low cost chopper stabilized op-amp (TSZ124IPT) available in large quantities. I have a development board that includes, on-board, the capability of measuring the

RCA jacks are FINE since I believe you redesigned so that one end is GROUNDED. Gordon

I propose that we use RCA jacks to connect to the solenoids. RCA wires are available everywhere, they have sufficient current rating to operate without problem and they are well engineered to mount on

I have now SUCCEEDED in reading temperature and ambient pressure using the surface mount bmp280!? ?I feel like I am on cloud 9 with all the hurdles I had to overcome.? ?The Arduino IDE got fouled

I wondered also.? ?But I don't know a solution. Gordon

I have this connector footprint on the pcb for expansion during test, adding sensors, etc. All three connectors shown below fit the same footprint. Vertical for use inside the case, right angle from

We found a part that has high analog output – 1.8VDC full scale … has a built in amplifier block… and is relatively cheap (< $10)… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ

Morning Ashhar, Taking back the design files now… I believe they are unchanged from last night? Nothing you’ve changed or added? Circuit snippet below is borrowed from another design: On that

We will need one analog pin and a ground terminal for the flow sensor. Please reserve. A simple set of 0.1 pins for connection should be all that is needed unless someone has other requirements. Dr.

Hi!? ?Typically this will sit on a table or hang (if desprate) from an IV pole.? ?during transfers, it will lay in the bed. Connects to everything should ideally come from the back -- but if they

This are questions for the doctors in the group. 1. How will the ventilator control box (that has the PCB) be installed next to the patient? will be hung on the wall or a stand or will be on a table

photos of my efforts to start interfacing to the bmp280..... That is half of an Ashar Farhan Bitx40 Raduino I soldered wires to, in order to get at the Arduino Nano Now I'm going to try and load the