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There are voltage level converters that can handle bi-directional conversion issues for I2C (RX/TX are unidirectional, so they should work ok with just about any logic level shifter). These are...

You can also use the micro SD card solder pads underneath the Teensy 4.0. Back before the Teensy 4.1 came out, various people were soldering flexible cables to attach the SD card reader, and there...

Others can give you more detailed information about this.



In almost all of the time, this is caused by code that waits for the Serial USB line to be initialized. Given you are being run off...

I'm not Paul, but I suspect it won't go into the Teensy proper, as it likely will raise the costs that relatively few people would use.

I've seen various USB C-PD trigger cables that when plugged...

It depends. Most can be.

However, if the sketch uses #ifdef ARDUINO_TEENSY40, it will have to be adjusted to #ifdef ARDUINO_TEENSY41 (or maybe use #ifdef __IMXRT1062__, which covers both).

If...

Here one of the threads about the work in progress for exporting things like SD cards and flash memory file systems. Unfortunately, it still might take some work to get it to work with the prop...

There is work going on, but I haven't kept track of it. I think two of the repositories are here, but it would be helpful if the people working on it could post a link to a howto:


...

There is work in progress to make the various flash memories available as a USB removable drive. Unfortunately, I haven't had time to keep up with it. Maybe somebody else can chime in with the...

Just to be clear, the issue is using the SPI devices with MQSR/MQSL and with the neopixel level shifters. If you don't use either the flash memory on the propshield or use an external SPI display,...

Many years ago, I did experiment with the propshield, neopixels, and SPI displays. I needed to use code to switch the pins from SPI mode to normal mode. KurtE suggested the code that I applied in...

You can use the mixer functions to change the volume.

However, I suspect the issue is the audio shield is designed for line out to be amplified before going to the speakers. When I've used it in...

In theory, if you don't use the feature nothing. Note, given how pins 11 and 13 are used for the LED lights already, if you wanted to use the flash memory on a Teensy 3.2, you would have to be...

You can do everything but audio directly. The Teensy 4.0 does not have a DAC (digital to analog conversion) pin that the 3.2 used to emit audio directly. But the Teensy 4.0/4.1 does have the MQSR...

Maybe it is time to add a few to my stock pile. I bought the last two at my local Microcenter.

Or perhaps dust off my SMT soldering skills and solder the SN74LV1T126DCKR's that I bought from...

FWIW, I have the following google spreadsheet that I've done over time to keep track of various microprocessor things. The first sheet is an attempt to track the pin differences between Teensy...

I believe all of the pins that take digital inputs on the Teensy 4.1 can be used for interrupts. IIRC, only the Teensy LC had restrictions on which pins could be used for interrupts. Note on other...

Out of curiousity, what is the outlook for the long term of the LC microprocessors? At the moment, it seems to be in good supply. I like using them when I'm doing small neopixel cosplay products...

Well the simplest approach might be just to cut the solder trace that connects the USB and VIN. The pinout card (https://www.pjrc.com/teensy/pinout.html) shows where the trace that you have to cut...

Ummm, I think the maximum voltage for the 74HCT245 chip in the Octows2811 that is used for level shifting is 5.5 volts.

In general, if you go over to https://www.pjrc.com/teensy/td_libs.html, it has all of the pages for documentation about the Teensy libraries.

From there, go to the SPI page,...

I'm sure there are many different enclosures. I typically don't worry about 'fancy' enclosures.

One that I've used in the past is the Altoids tin. You can get a regular Altoids tin (eat the...

To amplify what PaulS said, on the Teensy 3.x microprocessors, you can choose two sets of pins for the 3 SPI pins:

Pin 11 or pin 7 for DIN/MOSI;
Pin 12 or pin 8 for DOUT/MISO; (and)
Pin 13...

Cute. Though I'm having trouble thinking that a soldering iron would be made where the tip can't stand the temps. produced. But you never know these days. :)

Thanks. Yes, I don't have solder paste or a heat gun that isn't that directional. I'll maybe play with it, but as I said, I did recently pick up some more Teensy LC's. Fortunately, you can still...

My problem is with the USB header on place, there is no way to touch the tabs with the iron since the usb header is sitting on top of it. With PSrams and such, I can still see the top of the chip's...

I was doing a neopixel suspender for a local steampunk event, and I did a quick job to solder some wires to the Teensy LC (Vin, the pin 17 level shifted, and ground). Afterward the show, I noticed...

The Adafruit ItsyBitsy headers are great. Though connecting VUSB might be an issue.

However, I find the Sparkfun stacking headers for the Teensy 3.2/4.0 to be less useful. The ItsyBitsy headers...

Unless you are using really old Arduino shields, I believe the modern shields are now capable of running at 3.3v as well as 5v. Of course individual devices may still be 5v only, but again, I...

I assume you know about them, but in case you don't, Adafruit's ItsyBitsy processor has the same form factor as the Teensy LC/3.2/4.0 (other than the pins inside of the Teensy):

Short female...

Note, I'm a software guy, so possibly I'm off track in terms of physical characteristics of electricity....

I could imagine that one way to do it is carefully cut heat shrink tubing so it has...

In terms of pin assignment and such, I have made the following spreadsheet that attempts to document the pin changes between the various ARM Teensies. I also wrote a higher level summary in the...

To the OP, note except for the basic devices (Serial1, I2C1, SPI1), things may be on different pins. So, if you have made PCB's, you may need to revisit the PCB and layout.

It is problematical. The Teensy 4.0/4.1 does not have a DAC pin like the Teensy 3.2/3.5/3.6/LC microprocessors had. This means you can't just hook up the DAC pin to the prop shield and have it...

If you want to use hardware SPI, then you do need to use the hardware SPI pins for MISO, MOSI, and SCLK. The CS pins can typically be any pin. There are some hardware optimizations if you use the...

You might want to post your code exactly and mention what version of teensy dunio you are using. If you are using Teensy Dunio 1.56, it should just work, assuming you use BUILTIN_SDCARD for the SD...

I assumed you knew about the audio shield, and you couldn't use it either due to cost or it interfered with something on your board.

Be sure to watch (and rewatch) this video on the audio adapter....

Mjs513 posted an article I did a few years ago. I haven't done much in the last few years due to covid lockdowns and my own health issues, and such.

But some other things that might be useful. ...

Note, the Teensy 2 and Teensy 2++ are completely different processors (ATmega 32u4 if memory serves) than the ARM based Teensy LC, 3.x, and 4.x processors. Hopefully it will work straight out of the...

I assume it is obvious, but I believe you meant normal pins "can't" do USB.

There are various prototype boards that bring out the pins to positions you can use with a prototype board. Mostly, these are for getting access to the underneath pins of many of the boards. ...

If you are in Massachusetts, the Micro Center in Cambridge currently has 2 Teensy LC's and 2 Teensy 4.0's. I don't recall if You-do-it carries Teensys any more (they used to). FWIW, I'm in Ayer.

On the back of the Teensy LC pinout card (https://www.pjrc.com/teensy/pinout.html), it lists which pins can be attached to interrupts. IIRC, on the later Teensys, all pins capable of doing digital...

I've not used RTS/CTS, particularly with Teensy 4.0/4.1, but the Teensy library section on Serial UART devices has a description on what CTS/RTS pins can be used:

...

I agree, I've hated Python ever since it came out due to the white space requirements. I'm a perl programmer from way back, and I would have preferred perl to have won the mindspace that Python got,...

I'm curious if there is a reason you are sticking with the Teensy 4.0 instead of using the Teensy 4.1? The Teensy 4.1 has the SD card slot built-in, plus you can solder a PSRAM chip underneath if...

Technically, using "L" as a suffix makes the constant 'long double'. Fortunately for the usage, on current ARM compilers, 'long double' has the same representation as 'double'. But on other...

Those are solder pads that may be connected, but that with a knife you can disconnect them.

The top one is the connection between VUSB and VIN. Normally VUSB is connected to VIN to power the...

In general let me say, I am a software guy, not an IEEE engineer, so assume all of my answers are as I grok things (and having been part of this community since the original Teensy 3.0), and not with...

Well unless you are wedded to using a Teensy 3.2, another option is to get the Teensy 4.1 (which has a built-in SD card slot) and the new SmartMatrix display made for the Teensy 4.0/4.1 (note, the...

Note, if you are powering the Teensy with USB power, and drawing the power off the VIN pin, there is a fuse (*) between the USB power and the VIN pin that limits you to roughly 5 volts at 500 mA. I...