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  1. or some of these...

    or some of these https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM1200_1201.pdf which are intended for that job, are compact and inexpensive.
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    You might find it useful to study this...

    You might find it useful to study this and this.
  3. That module needs up to 300mA when transmitting,...

    That module needs up to 300mA when transmitting, the T4.0 is rated at 250mA, although I believe that is thermally limited.
    I suggest you supply the WINC1500 breakout board from the USB derived 5v....
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    Why not try Serialx. T4.1 has 8 serial ports to...

    Why not try Serialx. T4.1 has 8 serial ports to connect to up to 8 T4.1s.
  5. See here:Read wii nunchuck on teensy 3.0 (Read...

    See here:Read wii nunchuck on teensy 3.0.
  6. What you want for a level shifter is an ADUM1201...

    What you want for a level shifter is an ADUM1201. They can be obtained ready mounted on breakout board like this.
  7. Was that of any help to you?

    Was that of any help to you?
  8. Have a look at this...

    Have a look at this and this. The latter one has the latest code for teensy Tx (I believe) towards the end of the thread.
  9. I did a quick (5 seconds) search and found these...

    I did a quick (5 seconds) search and found these.

    EDIT: They are an expensive solution. You could use a pair of these, connect one to a second Teensy and program it to program the first Teensy....
  10. NO! Use multiple I2C ports for multiple TSL2591.

    NO!
    Use multiple I2C ports for multiple TSL2591.
  11. I searched MCP2515 with Google and found this...

    I searched MCP2515 with Google and found this and this, it should help.

    This library seems to have examples for t3.x so should be further help.
  12. Teensy does not have a reset button, only program...

    Teensy does not have a reset button, only program button.
  13. Just change from Debug setting to Release, then...

    Just change from Debug setting to Release, then no debug code is added.
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    Are you measuring battery voltage? If not how...

    Are you measuring battery voltage?
    If not how will you know whether the Teensy is about to fall over?
    If you are what voltage are you allowing to be your lowest operating voltage?
    Using 3.5 volts...
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    What voltage will you be considering for your...

    What voltage will you be considering for your lowest allowable / operational voltage. I see that you have a pull up to 3.3v. Where are you getting this 3.3v from?
    Below is the voltage curve for the...
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    Found this...

    Found this, I don't know whether it will be useful or not.
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    Yes, I am using some of these in my remote...

    Yes, I am using some of these in my remote monitoring system.
    They have both 5v and 3.3v output.
    I solder a lead directly to the battery +ve connection so that I can monitor
    battery voltage, so as...
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    Why don't you use one of these in circuit...

    Why don't you use one of these in circuit chargers which also gives 5v output? Then you can use a MIC4417 Mosfet gate driver.
    26561
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    While plugged into the circuit or are you taking...

    While plugged into the circuit or are you taking the battery out to charge it?
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    Can I ask you a quick question? How are you...

    Can I ask you a quick question? How are you charging the LipO?
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    Use one of these...

    Use one of these or one of these.
    Could well solve a lot of problems. Those prices are for lots of 5 for the first and 10 for the last by the way.
  22. Another solution might be to use some Ebyte E32...

    Another solution might be to use some Ebyte E32 Lora radios.
    They communicate with the Teensy using Serial Uart.
    The radios can be addressed from a master broadcasting to all or individual slaves....
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    Serial USB intermittently does NOT print.

    DISREGARD FOR TIME BEING.
    The code below does not work reliably with USB Serial.
    It intermittently prints out nothing.

    /***************************************
    This shows the use of the Snooze...
  24. 53,000 simple formulas per second.

    53,000 simple formulas per second.
  25. Where is that documented?

    Where is that documented?
  26. You are not likely to get much help if you don't...

    You are not likely to get much help if you don't show your code.
    Enclose it between code tags using the # button.
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    USB could be taken out on an extension cable.

    USB could be taken out on an extension cable.
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    Just tried again 19 (14MB/s) seconds this time,...

    Just tried again 19 (14MB/s) seconds this time, unfortunately although Windows indicated that the download was complete, it would not open for a very long time and Windows Explorer just hung. Freed...
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    Took 44 seconds here. EDIT: 300Mb/s connection....

    Took 44 seconds here.
    EDIT: 300Mb/s connection. I did have problems with one forum page earlier on but after re-trying for 30 seconds it cleared itself.
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    As a solution to the RTC problem I found this....

    As a solution to the RTC problem I found this.

    It's an RTC with ultra low power with a current drain of 45nA and an accuracy of +/-1 ppm.

    And the good thing is they will send you some FREE...
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    Welcome to the fold, I am sure you won't forget...

    Welcome to the fold, I am sure you won't forget it.
    Things to bear in mind though, you may find that the RTC back up battery does not last very long and there may be drift over time (sorry about the...
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    That is correct.

    That is correct.
  33. You can get that by using VisualMicro with Visual...

    You can get that by using VisualMicro with Visual Studio.
  34. You might try NOT setting the SPI pins using...

    You might try NOT setting the SPI pins using pinMode as shown below.
    /*
    * AMT20_SPI_Sample_Code.ino
    * Company: CUI Inc.
    * Author: Jason Kelly
    * Version: 1.0.0.0
    * Date: August 8, 2016
    *...
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    Don't know whether this...

    Don't know whether this will help. Just more info/user experience.
  36. You could look at this...

    You could look at this library. I know it's not using i2c_t3 but it might be easier to modify than the AdaFruit library.
  37. I suggest you look here...

    I suggest you look here at the bottom of the page.
  38. I was talking about Serial1 on the Teensy....

    I was talking about Serial1 on the Teensy. Perfectly stable.
    I don't know about the stability of the rpi serial ports, though you can feed the serial output from the Teensy serial pot to whichever...
  39. OK, I am afraid I won't be able to help you with...

    OK, I am afraid I won't be able to help you with that, I have never used SPI, so have no experience with it.
    Just a thought, it might be worth printing out the contents of data to see what is coming...
  40. When you say error, what sort of error? Is it the...

    When you say error, what sort of error? Is it the error message from your Serial.write, or some other error?
  41. Use Serial interface. (Not usb serial aka Serial...

    Use Serial interface. (Not usb serial aka Serial ).
    Use a real serial port, ie Serial1.
  42. No problem. EDIT: I am no SPI expert, but I...

    No problem.
    EDIT:
    I am no SPI expert, but I think you are using SPI.beginTransaction wrongly.
    Since you are only using one SPI device you do not need to preserve and reinstate SPI settings.
    That...
  43. I am sorry but you don't. At least NOT in the...

    I am sorry but you don't. At least NOT in the code contained in your previous post. You have Serial.begin but NOT SPI.begin.
  44. I believe that you need to call SPI.begin()...

    I believe that you need to call

    SPI.begin() before calling
    SPI.beginTransaction(SPISettings(clockspeed, MSBFIRST, SPI_MODE0))I am not sure if this will cure your problem, but certainly worth a...
  45. Ok, so I would suggest sprinkling some...

    Ok, so I would suggest sprinkling some Serial.print statements to indicate where the code is going wrong.
    I have put some in your code below. You might want to change the text to something more...
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    I am afraid I think the Sleep Library is not...

    I am afraid I think the Sleep Library is not supported any more.
    I have in the past asked questions and got zero response.
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    Why not have a variable which can be set by the...

    Why not have a variable which can be set by the user.

    I don't know call it SerialUartSpeed, let's say with a value from 0..255.
    At 255 (default) the Serial Usb goes at it's fastest as at the...
  48. Please in future enclose your code with CODE tags...

    Please in future enclose your code with CODE tags using the # button above.
    This preserves the presentation of the code, as shown below, and makes it easier for someone to understand your code and...
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    Ok, Got it. I had to write a small sketch to...

    Ok, Got it. I had to write a small sketch to prove it to myself.
    You learn something new each day. Thanks.
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    I can't see how that is safe. By way of example...

    I can't see how that is safe. By way of example lets assume that millis starts at 0, goes to 100 then wraps round to 0 again. I know it doesn't but this is to demonstrate the problem with your code...
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