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If you show your code someone might be able to help you. (FORUM RULES)

One of the benefits of using C/C++!

ld.exe: C:\Program Files (x86)\Arduino\hardware\tools\arm\bin\..\lib\gcc\arm-none-eabi\15.2.1\..\..\..\..\arm-none-eabi\lib\thumb\v7e-m+fp\hard\libstdc++.a(hashtable_c++0x.o): in function std::__detail::_Prime_rehash_policy::_M_next_bkt(unsigned int) const hashtable_c++0x.cc*...

Why not use one of these? It's a switch mode psu as a direct plug in replacement for a 7805.

The bootloader chip reads the MCU SN and locks itself to that MCU. If you get a new MCU you WILL need a NEW bootloader chip.

Hi @Turby, I see you use my Nextion library. Some time ago I updated it to version 2, called Nextion2. I am currently working on a version 3. The latest does not include many updates, just sorts out some potential problems. Edit: I should have said that Nextion2 has many enhancements and is...

I use nextion (Intelligent Series) with my own library.

The Teensy has TWO clocks. The Teensy clock and the RTC clock. These need to be synched. In your setup put setSyncProvider(getTeensy3Time); I believe that this links the two clocks together. To get the time when running use time_t getTeensy3Time() { return Teensy3Clock.get(); } Of course...

Yes, that's why I always use RV-3928_C7. I've had one going for years on the original battery. Extremely accurate as well.

He says he has:- Teensy 4.0 connected to nothing except CR2032 connected to VBAT and GND

I note the plan to have the aerial directly above (or below) the metal can of the SD Card reader. How will this affect the aerial performance?

Change // initialize USB serial port Serial.begin(115200); a = micros(); while(!Serial) { if ((micros() - a) > USBTimeout) { break; } } to // initialize USB serial port Serial.begin(115200); while (!Serial & millis() < 3000) {} //...

Here is a YouTube video showing the changes made to the TI part, highlighting potential problems using this part. Just as a snippet, the slew rate has almost HALVED!

Where are you?

Note that this ONLY applies to the Texas Instruments version of the part.

Given that this may be detrimental to the life the Teensy I would recommend that it is NOT part of a library ( that would make it too easy to apply ) but a method on how to achieve it should be CLEARLY documented. i.e. make it available but not too easy. The user MUST explicitly want to make the...

BE AWARE. BitDefender does NOT like the links above!

From @Paul. Although it quotes Teensy 4.0, I believe the sequence/requirements are the same for Teensy 4.1.

When posting code, can you do it between code tags using the </> button. It makes your code so much more readable and therefore more likely to get a responce. I have posted your code below so you can see the improvement. #include <Arduino.h> #include <USBHost_t36.h> #if...

Keep a log of filename(s) in EEPROM.

Thanks @Paul, over to you @bmwcyclist.

@PaulStoffregen this gentleman is trying to contact yourself, as requested, but is having problems. Could you investigate.

The server is currently down, and being rebuilt. I might be up later today.

Still OK (PJRC) in the UK.

Having examined the audio library supplied with Teensyduino I cannot find the example you mention above. I do not believe that it is Paul's code.

@Paul You have the wrong address here "Arduino 1.8.x, Windows: https://www.pjrc.com/teensy/td_160-beta1/TeensyduinoInstall.exe" should be "Arduino 1.8.x, Windows: https://www.pjrc.com/teensy/td_161-beta1/TeensyduinoInstall.exe"

I might be wrong, but one advantage I see of using Serial between the Teensys is that you just do a Serial.print.... and it's all buffered and your code can go and get on with other things.

You might want to look at the Snooze library. It is included with Teensyduino.

For UART (RFx,Tx) level shifting, better to use ADUM1201.

When powering a Teensy project I invariably use a Raspberry Pi Power adaptor. They are usually well priced and I guess of sufficient quality.

I have no problem doing T4.0 on Arduino IDE 1.x.

It would depend upon the circuit of the LCD. I am not familiar with PlatformIO but you program still has #include <LiquidCrystal_I2Cw2.h> and potentially not #include "LiquidCrystal_I2Cw2.h". PlatformIO is complaining that it cannot find LiquidCrystal_I2Cw2.h.

As Paul mentioned if you have LiquidCrystal_I2Cw2.h in the "Libraries" directory use #include <LiquidCrystal_I2Cw2.h> else if it's in the same directory as your program use #include "LiquidCrystal_I2Cw2.h". If you want the ultimate guarantee use #include "C:\Location of...

I think that in order to fully understand what is going on, you need to get some idea of the interface board circuit. I am pretty sure that R5 and R6 are I2C pull up resistors. We need to determine what J1, J2 and J3 do. Also what is Q1? If we can generate a circuit then we will be better...

OK, lots of things here. If the display is a Buydisplay.com display, and I have no reason to believe that it isn't, 1) If you were to buy the display from Buydisplay.com, you are asked if you want a 5V interface or 3.3V interface. Which version do you have!? If you have the 5v version you will...

... also, what is the motherboard you are using?

Can you tell us the exact display module 6that you are using, so that we may be able to look it up. Someone might even have the display and be able to more easily work out why it is not working.

No problem. I'm glad you found the information you required.

To save others translating there it is:- OK, thank you for your reply. I think I've found it.

The one (library) that I highlighted does.

You could look at this one. Has an ability to choose which wireX to use. Alternatively you could choose a library with a fixed wire and change all entries to wire2 or wire3.

I suggest you look on the manufacturers web site.

Here goes the First Chapter, just dealing with installation. Download Visual Studio Community [VS](free) from here. Install the program..during installation the following screen will appear. I have selected all the items that I require but as a minimum you MUST select the two items circled…...

Ok, I will try and put something together. It might take a little while, I will have to set up a target system first.

For large projects I use Visual studio, writing to a "Phantom Teensy i.e. simulating the Teensy bits I am interfacing". That way I can single step where necessary and find the problems in my code. I even use it with Nextion code, which is extremely difficult to debug..no serial.print. Like the...

Answers 1-No, 2-(1 was a no), 3-YES, 4-probably.

This is w hat we need to see the circuit for. It's quite possible that the ADC has been damaged by input voltage.

If we can see your circuit schematic and/or photo of your layout we may be able to help.

I don't think so, Teensy has it's own library PS2Keyboard.h.

As far as I can see there is nothing about that library that is specific to PJRC or Teensy. Perhaps you should contact the author at paul@pcserviceselectronics.co.uk.