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    Worked beautifully. Thank you.

    Worked beautifully. Thank you.
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    NRF24L01 and Teensy 3.1

    Just started with NRF24L01. Not used these boards before. Hit a compile issue with "Serial.printf".

    I have modified some code that I already use the SPI bus for on an ADF4351 board (which works...
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    I was just thinking that it might be useful to be...

    I was just thinking that it might be useful to be able to "synchronise" two Teensies together - in sort of "Lego" brick fashion. Perhaps allow one system clock to influence another one (or maybe even...
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    Will the 1170 have DACs as peripherals? These are...

    Will the 1170 have DACs as peripherals? These are useful to "glue" the digital world to the analogue world. (Note for our US cousins... there's no such thing as "gl") Tee hee.
  5. Comparator Stand-Alone Test

    Here is a little help with using a T4 Analog Comparator. It uses the peripheral ACMP3. Normally, the ACMP3 output is available on pin AD_B1_14 (see page 295 of iMXRT1060 Ref Manual Rev2). But this is...
  6. Not sure your principle of using the analog...

    Not sure your principle of using the analog comparator in this way is the best method for creating a Frequency Counter. There is an "overhead" in time to be paid for calling an ISR subroutine and if...
  7. Thanks MarKT. That makes sense of the experiment...

    Thanks MarKT. That makes sense of the experiment results. Didn't realise that Schottky was so leaky (must remember that).

    Your comment on CMOS and latchup is valuable. Over voltage on any analog...
  8. Sdm40e20ls

    This surface mount diode SM40E20LS looks like a real beauty. The "typical" graph in the data sheet shows less than 0.3 volt drop for even 100 mA at 25 degC. If you could employ 100 mA into a diode...
  9. Stop press

    Woah - hold everything...

    It does NOT look like there are internal diodes such as Fig 35 suggests. The assumption that all to the right of point VADIN was internal is NOT correct as far as my...
  10. iMX RT1060 Data Sheet

    A very interesting question - the protection of Analog inputs by NXP.

    Searching the NXP web site today, the iMX RT1062 is not listed (?), but the iMX RT1060 and iMX RT1064 are listed. Both have a...
  11. I hope others will study and make some useful...

    I hope others will study and make some useful comment. Quite a lot here to think about...
  12. Interesting Tom. I too had considered mattress...

    Interesting Tom. I too had considered mattress inflators as a pressure source. You success with flow sensors has my respect. Its a tricky subject.

    My point about failure modes is - like software...
  13. Magnificent. A remarkable effort and an...

    Magnificent. A remarkable effort and an impressive result.

    If you can spare the time, I would love to read about your thoughts and problems as you went through the phases from initial...
  14. When giving advice it can be a little bit of a...

    When giving advice it can be a little bit of a worry. No-one wants to give advice that could end up frying your kit. And this is the problem with a question such as you try here to put into words.
    ...
  15. Hi. Hope you have figured out the diode symbol by...

    Hi. Hope you have figured out the diode symbol by now.

    You asked - in post #1 - which way around a diode should be soldered. I confess that the symbol is confusing. But there are clues to "which...
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    Sig Gen Si5351 - 4 KHz to 100 MHz

    The Si5351 Clock Generator chip has several excellent mentions in this forum previously, but I wanted to create a very simple design that anyone can put together in a few moments with a breadboard....
  17. Also... for a voltage division, you will need R1...

    Also... for a voltage division, you will need R1 and R2, where R1 is between signal source and pin, and R2 is between pin and GND. The division is then R2/(R1+R2)*Vsig. For a simple 3:1 division,...
  18. From your description, it is difficult to...

    From your description, it is difficult to understand what you are trying to do. This thread may help... https://forum.pjrc.com/threads/28722-Teensy-3-1-Analog-pin-ADC-impedance. A.C. alternating...
  19. New test technique

    Interesting developments are now happening with COVID-19 antigen testing (the swab test - to see if you are currently infected). There is a new technique called LAMP (Loop mediated isothermal...
  20. The invisible enemy?

    Would it be possible to view and detect SARS-CoV-2 using a conventional optical microscope? This corona virus has dimensions between 70 - 90 nm for a single virion particle.

    With an optical...
  21. @jimmyson - Which country do you refer to?

    @jimmyson - Which country do you refer to?
  22. Energy considerations

    One aspect of cellular infection by viruses - that has important implications for the symptoms we shall experience - is the demand for ENERGY. Most of us have experienced the intense feeling of being...
  23. I think you have something like Omeprazole in...

    I think you have something like Omeprazole in mind? Which is a PPI for GERD. My guess is (and it is a guess) that different drugs will be specific for different types of cells. So Omeprazole may be a...
  24. The mechanism by which the drug Choroquine might...

    The mechanism by which the drug Choroquine might work is extremely interesting... It appears to be as simple as the "antacid" control of a fluid. Chloroquine will elevate the pH of a solution.
    ...
  25. @KurtE - Simulations are good teachers - a...

    @KurtE - Simulations are good teachers - a picture is worth a thousand words. They are good at illustrating an event that you know for certain happens, but they are poor predictors of events that you...
  26. Interviews with Prof Racaniello

    This guy Prof Vincent Racaniello is well worth listening to directly about SARS-CoV-2 and COVID-19. He did an interview with Ethan Evans (Greater Seattle Area, U.S.) about five weeks ago...
  27. Came across this recent series of lectures on...

    Came across this recent series of lectures on VIROLOGY which members may find interesting... https://youtu.be/lj3NhPgOoX4

    Prof Racaniello makes a number of references to SARS-CoV-2, so very...
  28. @MatrixRat - How is your project#1 coming along?...

    @MatrixRat - How is your project#1 coming along? I have now logged a fair number of days of manual body temperature readings - and learnt a few things. My lowest (accurate) data recording is 35.7...
  29. My take is that its his role as Prime Minister...

    My take is that its his role as Prime Minister which is truly significant. As if things are not bad enough, this could turn the UK upside down (again) in hours. Parliament was suspended early and has...
  30. Serious development in the UK

    It has just been reported on UK news channels that Boris Johnson, our Prime Minister, has been admitted to hospital. He placed himself in self-isolation 9 days ago. We expected (if he had a mild form...
  31. Transistors could be the answer to testing

    Came across a very intriguing article today. Biological sensing transistors, known as "BioFETS" https://cardeabio.com/field-effect-biosensing-technology/. These are transistors based upon GRAPHENE...
  32. Mercedes F1 Ventura CPAP device

    Some more info now available on the Mercedes F1 CPAP device. You can find a picture of the blue hand-sized gadget about half-way down this webpage...
  33. @slomobile - The idea of using NMR/MMR as a...

    @slomobile - The idea of using NMR/MMR as a specific SARS-CoV-2 test (wild speculation) would be attractive if this could be engineered into something like a "finger tunnel", where insertion of a...
  34. CPAP in the news again......

    CPAP in the news again... https://www.bbc.co.uk/news/health-52087002

    I note the Formula 1 racing techies involvement. Patient gets blown up like a balloon when the turbo kicks in!
  35. Cheap Digital Thermometer Teardown

    Cheap digital thermometers seem to be still widely available on eBay. I ordered two yesterday. I am using one that I've had for a long time for my own measurements, and I wondered about battery life....
  36. Good reference. Well done. Here is its spec...

    Good reference. Well done. Here is its spec (https://e-vent.mit.edu/clinical/key-ventilation-specifications/) and here the original...
  37. The new "Emergency Powers Act" came into law last...

    The new "Emergency Powers Act" came into law last night throughout the UK. There is a whole bunch of things in it. One likely to be used quickly will be a 30 instant fine for being caught on the...
  38. Hi Kurt, reading the article, my take is that...

    Hi Kurt, reading the article, my take is that this COVID EMERGENCY VENTILATOR is for home use. The air will be full of contaminated aerosol. The description even explains that it sucks in the ambient...
  39. Project#2 related: Here is an interesting example...

    Project#2 related: Here is an interesting example of what can be done (with effort and the right resources)... (its CPAP)...
    ...
  40. This links with a (lengthy) facebook thread for...

    This links with a (lengthy) facebook thread for further details. I don't use facebook but my wife does and eventually I found this GoogleDoc......
  41. @MatrixRat: Now you're talking mate. Thinking...

    @MatrixRat: Now you're talking mate. Thinking like this is needed for Project#1. Don't worry about the software - lot's of us here to muck in with that. Just think, if we optimised the design, the US...
  42. Can I make a request please for all to amend your...

    Can I make a request please for all to amend your forum profile to include your country (and/or state for the larger continents). Then we can appreciate what is happening and where. Thanks.
    ...
  43. Continuous monitoring is a toughy. What about a...

    Continuous monitoring is a toughy. What about a 10 MHz crystal sensing body temp as part of an oscillator. The radiated frequency can then be monitored remotely by near field radiation for logging....
  44. Change in the UK tonight - Monday 23 MAR 2020

    We have just had a broadcast at 8.30pm tonight on national TV from our Prime Minister, Boris Johnson...

    The UK is now in partial LOCKDOWN with immediate effect. This applies to all citizens. All...
  45. @slomobile - Yes, gathering data is vitally...

    @slomobile - Yes, gathering data is vitally important. I'm persuaded to "flip" the project management sequence. Or even discuss several "aspects" in parallel. If we can brainstorm and agree the...
  46. Gosh, they are tiny, 2.5 mm square and 1 mm high....

    Gosh, they are tiny, 2.5 mm square and 1 mm high. Teensy peripherals should be fairly easy part of a Project#2 design. However, getting delivery may not be so. My biggest concern is the...
  47. OK. You have identified one possible solution...

    OK. You have identified one possible solution (DS18B20 + Teensy = Horse and Cart). Now what exactly was the problem?

    Our problem is COVID-19. We would like to know if we have it or not. This...
  48. Time to consider real projects

    The events of this week are momentous (understatement). Lockdowns in California, Illinois, New York in US. Lockdowns in Europe. Lockdowns elsewhere. Events are too big to write about with any...
  49. The most uniform field we all have at our...

    The most uniform field we all have at our disposal (unless you are at the North/South poles) is the Earth's magnetic field. The problem which arises is objects nearby distort it, such as metal...
  50. Just a simple reminder of post #1 please. Is your...

    Just a simple reminder of post #1 please. Is your contribution factual? And beware of emotional enbroidery...

    @defragster: SpO2 meters. For others who may not have studied these, they work on the...
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