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  1. 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...
  2. 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...
  3. 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...
  4. @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...
  5. 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!
  6. 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....
  7. 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...
  8. 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...
  9. 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...
  10. 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)...
    ...
  11. 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......
  12. @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...
  13. 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.
    ...
  14. 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....
  15. 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...
  16. @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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. Frank speaks for us all. I have some small...

    Frank speaks for us all.

    I have some small appreciation of what you describe. My wife discovered that she inherited HemoChromatosis with a defective C282Y which is "Iron Overload". She too has...
  23. Same issue in the UK. Our schools close tomorrow....

    Same issue in the UK. Our schools close tomorrow. Exams cancelled. Exam results will be "forecasted" for things like UNI entry. Grim times.
  24. Now you're talking my language :D with both these...

    Now you're talking my language :D with both these references.

    I specifically like the Pulse Transit Time idea. I have an unusual heart rhythm (premature atrial contraction) so have been learning...
  25. MatrixRat deserves the credit for "Starship...

    MatrixRat deserves the credit for "Starship Earth". (I loved Melbourne, Victoria when I was working there in 1980 and 1981 MatrixRat). Good on yer mate. Another famous Aussie saying is "She'll be...
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    Thanks Paul. Here is a starting link... ...

    Thanks Paul. Here is a starting link...

    https://forum.pjrc.com/threads/60071-COVID-19-A-thread-to-share-some-thoughts-and-events?p=233263#post233263
  27. COVID-19: A thread to share some thoughts and events

    Thanks to PJRC for supporting this thread. Neither I nor anyone knows where this may take us or when it will end. The first important consideration is to keep things positive and constructive...
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    We will need permission from PJRC for such a...

    We will need permission from PJRC for such a special thread on COVID-19.

    I can appreciate that there may be some reluctance, not being directly Teensy product related. The relationship, if any,...
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    A suggestion...

    Been an extraordinary day world over. Events are now moving very rapidly.

    We have an excellent community for Teensy and I'm sure many would like to understand the new situations in different...
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    Had a chat with a contact in Hong Kong this...

    Had a chat with a contact in Hong Kong this morning. He tells me that things seem to be under control there now. Mainland China too. Isolation policies appear to be effective.
  31. @Brion - Excellent question. Many beginners would...

    @Brion - Excellent question. Many beginners would be asking the same. @luni - Excellent reply, maybe add a snippet for reading incoming characters on a Win PC?

    Does anyone have source for a simple...
  32. This seems to be a question in dispute...

    This seems to be a question in dispute (https://forum.arduino.cc/index.php?topic=326153.0). I'm running from the Teensy 3.6 3v3 pin so that may be preferable to 5v. But I'm still cautious. Last week,...
  33. DS3231 - Extremely Accurate 32,768 Hz

    Frank, I thought this DS3231 topic worthy of a new thread. Many thanks to you for pointing this device out to me. (For other readers - This is a temperature compensated 32KHz real time clock).

    I...
  34. Just noticed that the data sheet describes an AGE...

    Just noticed that the data sheet describes an AGE register which looks useful for modifying frequency. It suggests that at 25 deg C, a 1 bit change alters the frequency by 0.1ppm. This can only be...
  35. The DS3231 looks to be an excellent device. It...

    The DS3231 looks to be an excellent device. It quotes +/- 2ppm so looks fine for mcros() and millis() as standalone. Has a few other interesting features. Great value.

    Have you tried receiving...
  36. I found Sumatra PDF reader...

    I found Sumatra PDF reader (https://www.sumatrapdfreader.org/free-pdf-reader.html) to be excellent for quick loading.
  37. Useful method. Good to know its fairly simple.

    Useful method. Good to know its fairly simple.
  38. Sketch Code and Description

    Below is my current sketch to generate a precision 60 KHz. This is still a work in progress. When fine control is in operation, the slow drift back and forth (wrt GPS) of signal edge transitions is...
  39. Temperature Stabilisation

    (... that should read "directly proportional to the frequency difference" in the last paragraph, not "inversely proportional".)

    As the 24 MHz crystal module warms up from switch-on, I discovered...
  40. Applications where a "reversal" of polarity e.g....

    Applications where a "reversal" of polarity e.g. a bridge type circuit could use two (in push-pull mode). Analogue two phase or analogue phase quadrature potential. Usage may be dependant on the...
  41. Phase Comparison

    A second design consideration with this experiment was to engineer a new mechanism for "phase comparison" between two 60 KHz waveforms - that is, between Trace 2 and Trace 3 in the previous picture....
  42. T4 and phase lock to a 60 KHz Time Signal

    One of my current experiments concerns revisiting the UK MSF Time Signal on 60 KHz and investigating what advantages (if any) a Teensy 4 can offer in respect of achieving phase lock with its carrier...
  43. DACs are very useful for controlling external...

    DACs are very useful for controlling external VCOs, especially those with sine wave outputs at HF frequencies.
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    Not used "FreqCount" library myself, so maybe...

    Not used "FreqCount" library myself, so maybe someone else can advise about this library. The comparator input signal goes in on Pin 18 and the sq wave output comes out on Pin 2 (and the code would...
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    Be aware that T4 is not 5 volt tolerant. I...

    Be aware that T4 is not 5 volt tolerant.

    I used to consider external components for beefing up a low sinsusoid signal, but then discovered the delights of using the internal comparators (in T3 and...
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    Baud Rate for IDE Serial Monitor

    Am I correct in thinking that setting the Baud Rate for the Teensy port to the Arduino IDE Serial Monitor (e.g. "Serial.begin(115200);") over the mini USB is rather academic?

    I wrote my own Serial...
  47. Interesting perspective from a software engineer....

    Interesting perspective from a software engineer. For those who learnt hardware first, then came into software (once progress had caught up), they see things differently. What is BAD about magic...
  48. I had a look at page 26 as quoted but could not...

    I had a look at page 26 as quoted but could not find this reference to 12 mA? Are you looking at a different page? Maybe a typo, what paragraph number?

    On page 26, the first line says "Table 13...
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    @Paul - Have a quick look at...

    @Paul - Have a quick look at https://forum.pjrc.com/threads/57386-T4-Quad-Timer-Capture-and-Output post #5... there is code there where you might reproduce a Win serial mon issue?

    I have since...
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    Have done a bit more work today. Today's first...

    Have done a bit more work today. Today's first step was to extend QT1 to have two timers running (both of the QT1 group). Timer2 still used Pin11 as the trigger input for its own counter, but I added...
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