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PWM speed control of motors should be easy to test using tthe PWM output of an Arduino, along with air pressure monitoring that you already have. Arv _-_

This is the first set of tests, carried out using +5VDC powering an Adafruit BMP280, over 6" and 6 FOOT wires (see explanation inside) -- against a 7 MHz 50 watt ham transmitter with an antenna right

All, I am a Tire Design Engineer at Michelin and working with Jim from the above post.? After looking at the failure mode of this valve it looks like the repeated flexing of the tube is what is

I still can't get out of my head using an air actuated pinch valve for the this.? ?However this requires a larger ID as the exhalation must pass through the tube instead of between the tube and the

That’s because the pressure reading it temperature compensated, If you don’t read the temperature first, it uses a fixed value of 100F… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ

Farhan: I simply responded to Gordon on the thread where he posted the question. Jack, W8TEE

Dear all, I've been re-reading the specs and considering the "must have" 30 minutes backup battery. The issue had been addressed for sure but in the all this coming and going of messages I might have

Our team expects to complete an OS Vent assembly by this weekend.? Are there any testing instructions?? We have a concept to build a test lung.? Is it important at all to have the patient

It is at my http://github.com/afarhan/osvent

Well let’s try that again: bubble it through water and then breathe it and it will be humidified.

Bubble it through air, and then it will be humidified gas.

The BME sensors should be on the human side of the lawn sprinklers. It really shouldn’t see a pressure above 100 cm above atmospheric. That should be easy to seal with. Are you possibly putting them

I added a 3/4" PVC thread adapter to the PANDA PEEP I printed and it is in high cycle testing along with one of my PEEP designs and two Rainbird valves. See "High cycle test..." topic? post #1085. I

I have a test valve setup running with two Rainbird CP075 valves and two 3D printed passive valves, the PEEP I designed and a PANDA PEEP I printed here in PETG. A BenchDuino prototype board with an

Here is what I found : You HAVE to, you MUST read the temperature before taking the pressure readings. If you don't the pressure reading goes potty. I have added that to my code it works quite well. -

I am putting that in temperature control as well. I have been breathing with this for the last one hour. It dries up the mouth and gives me a kind of a high but that apart, it isn't so bad at all.

Those temperatures look fine!? In fact, it could be viewed as an ADVANTAGE. You will need to have code that checks for overtemperature and warns the user.? ?I would suggest above 38 degrees to warn

the air is actually at 39 degrees if i run the vacuum cleaner continuously. with the 1:1 cycle it drops to 36 degrees. Here is the log of pressure and tempurature over one cycle (after 15 minutes of

Ashhar, you may need to give us explicit links to that excellent code so we can find it!!

Great work, Asher and others!! The Triac solution has been suggested before but I didn’t want to bother you.