I remember that board. The OSH links were originally from a user 'CPT' on Osh park, but those links are now dead (shared_projects/Gnvbt7io on oshpark.com).
Doing a little google searching shows this link on github...
Many of us power our Teensies with lipo batteries.
If you want to incorporate battery charging with the lipo (connecting the VUSB pin to charge the battery) there are several options:
...
This thread posted in 2016 had an attachment that is claimed to have Eagle layouts for various Teensys:
https://forum.pjrc.com/threads/38096-Teensy-3-6-Eagle-Library?p=120392#post120392
Note, the spacing...
On Teensy boards (just like many Arduino boards), the pins are overloaded. Pin 13 does have a LED on it, but it is also used for:
If you are using SPI with the normal pins, it is the SCLK (clock) signal. In this...
Well Adafruit has a basic tutorial:
https://learn.adafruit.com/16-channel-pwm-servo-driver
If you search the Adafruit learning site, there may be more advanced tutorials.
In theory, you can chain up to 62...
Also, you may want to figure out whether how you would power all of those servos. I suspect it may be better to farm out the servos to separate boards that handles power (and power them with more power than a simple...
I haven't done that type of USB low level programming, but two thoughts occur to me:
1) If you can change the software on the host, you might switch to using USB HID: https://www.pjrc.com/teensy/rawhid.html. I...
Well to see how it really works, you have to do a deep dive into the library sources and also read the processor manual for the particular processor involved.
In general, each pin has several modes that it can be in,...
Note there are places where there are overlaps. For example, the built-in LED is on pin 13, and the default SPI SCLK pin is also on pin 13. In this case it doesn't matter, in that SCLK is an output only pin, so it...
Within the USA sources include:
PJRC itself: https://www.pjrc.com/store/. My main issue is I'm east coast based, and using the cheaper ground or USPS options means it is a week or so to get the boards.
Adafruit:...
As Frank B says, the 3.6 is not tolerant of 5v at all, and you are likely to fry the 3.6 if you use a 5v connection.
To do it properly, you need a bi-directional i2c level converter that you plug 3.3v, SCL, & SDA on...
It depends on whether you count the Teensy LC as a Teensy 3.x board (which generally it is, unlike the Teensy 2/2++ boards). Then you would use the following:
#if defined(__arm__) && defined(CORE_TEENSY)
...
Depending on the Teensy, you would might need a voltage divider to bring the voltage down to 0..3.3v. You wouldn't need an analog read, a normal digital read would do.
Note knowing anything about the internals, I wonder if you could create an Adafruit_GFX 'display' that acts as a normal display and records the screen information for circle, draw line, etc. Each call then would call...
It is a convention of the C/C++ libraries that strings have a null byte at the end. There are alternate versions of the libraries where you pass in the length, but for the default case, always make sure the array has...
Great! Any thoughts or plans to separate the Teensy bits to separate files so we can avoid the issue in the future? Ideally the latest Adafruit version would be included in the release and some way to get the versions...
Or possibly just have a mechanical on/off switch (you would need to record into the EEPROM or the flash memory the current file being played to start where you left off).
I put together a google document that goes overboard in terms of compatibility:
https://docs.google.com/spreadsheets/d/1LSi0c17iqtvpKuNSYksMG306_FpWdJcniSRR6aGNNYQ/edit?usp=sharing
Note, there is a sheet with...
From a user point of view and not from the view of somebody who has grok'ed the internal workings of the data sheet, I would prefer that we have separate Teensy libraries with the optimizations, and not modify the...
You might want to look at the zip file mentioned in this post. It has entries for both Teensy 3.0-3.2 and Teensy 3.5/3.6:
https://forum.pjrc.com/threads/38096-Teensy-3-6-Eagle-Library?p=118731&viewfull=1#post118731
And in addition to what defragster says, even on the Teensy 3.2/3.5 which does support 5v tolerance on the digital pins, any voltage above 3.3v (or the analog reference voltage if you use that) will be read as the...
The pins that do not have a digital pin value can only be used for analog input or analog output (in the case of two pins). The following pins are analog only:
Pin A10, analog input (inside row of pins);
Pin A11,...
I don't know about the ARM compiler, but it is certainly part of the compiler game. And it has been alleged that various compilers work better for building benchmarks than real code.
Generally, I do try to put in...
:D:D:D
Quite a bit, and of course some places that aren't optimized as well as could be.
Note, GCC has been worked on by hundreds of people in the 32 years since it was first released in 1987, though the number of...
I suspect optimizing 6 displays might be too much for the Teensy.
First of all there is a special optimization for optimizing some displays on the Teensy. In order to use it, you have to use the optimized drivers,...
My language of choice is using perl for that, but then I've been programming that since 1995. For some things I might use Gnu Emacs macros and/or write Elisp macros, but that has an even higher startup time to learn...
Adafruit sells a bunch of arcade button quick connects that it seems would do what you want. I would suggest going with the buttons they sell and mention as being compatible:
Quick connect wires:...
Teensy 3.2 changed the voltage regulator compared to the 3.1, and it moved the location of the reset pad underneath the PCB (and maybe D+/D- pads as well).
Yeah, I had just noticed that. I was hoping it might be a known bug. I must admit that I really like the ability in T3 to do Serial print's, not worrying whether the USB was connected or not.
Though I imagine there you want to get into having the ability to share memory with the display and/or use more pins in parallel to get around the SPI knothole of serially transferring 1 bit at a time.
Some time ago I collected links of various displays, including displays that have a smart processor on them. Some are a little on the pricey side.
Vizic Technologies
Home page: https://www.vizictechnologies.com/...
The current EEPROM functions (EEPROM.get and EEPROM.put) now use a template, so that you can store and read an entire structure, rather than having to write each byte separately like you used to have to. So in this...
Right now, the only supported method is via USB. There are various other solutions people have thought about and some implemented with varying degrees of success.
The simplest approach IMHO, is not to depend on...
Note that Paul's installer needs to modify files in the installation. This is why historically, every Teensy release will only work with specific Arduino releases where you haven't modified the files the installer...
You probably need to ban the use of the delay function (except in very specific cases), and learn to use the 'Blink without delay' programming style:
https://learn.adafruit.com/multi-tasking-the-arduino-part-1
...
I would imagine that would be too slow. Paul S. has generally said 'naive' level shifters made of resistors and diodes normally is not fast enough. The issue with the ws2812b is it has a very precise timing window...
In a previous post, I mentioned the Adafruit best practices page for Ws2812b LEDs (what Adafruit calls Neopixels). In that page is a link to the 74AHCT125 that is fast enough for ws2812b LEDs (most level converters...
I think i2c_t3.h uses a different method to change what pins are used than Wire, and if memory serves one or two other functions has a slightly different signature (uint8_t vs. uint16_t or something like that). That...
Maybe you need to get the updated library. It looks like there are 4 MP3 files in examples/testfiles that were added 4 months ago:
https://github.com/FrankBoesing/Arduino-Teensy-Codec-lib
With a Teensy 3.2 running the blink program with a featherwing adapter, a Teensy prop shield attached, no USB, and a freshly charged li-po battery:
The battery itself measured 4.1 volts;
The VIN pin on the Teensy...
It's been a year or two since I did the measurements, so I don't remember. But I'm about to solder up another featherwing for use with my 3.6, so if I think about it, I will try to re-measure it.
I have never read...
This is where "it depends" comes into play. However, since WS2812B leds are always written to sequentially, if you are having problems with some lights sticking on, you might also need to make sure your wiring is up to...
Not necessarily. There have been various bugs in FastLED on Teensys, which is why I suggested using the Adafruit library to make sure the basic setup works. Since I only use the Adafruit library (and I hope to start...
I recall when I first got the Featherwing adapter that I did some measurements between the Featherwing adapter comparing it to the Onehorse lipo charger. It took some digging, but it was in this post:
...
A couple of thoughts:
Check your solder joints and such for connectivity.
Some ws2812b LED strips need 5v to light up, many only need 3.3v to light up. Now, since you didn't mention powering the strip from the...
It is saying that F_CPU (which is defined when you select Teensy 3.6) is defined to be nothing. F_CPU should be defined to be the CPU speed.
You may want to start from scratch. Get a new version of Arduino 1.8.8...
I assume this is obvious, but it is my experience that sometimes what I think is obvious might not be, or things might get forgotten because Paul/Robin are doing so many things.
Anyway, when it comes time to do the...
I was soldering up a Teensy 3.6, soldering stacking headers to all of the outside 48 pins, and soldering in normal headers for the USB/Aref/A10/A11 and USB header when I noticed I was running out of solder. I need to...
I have started updating my Teensy google spreadsheet adding the T4 stuff from post #3. Right now the link I've given out before does not include the T4 stuff, but it is available as another sheet in that document. ...
I may have seen it before, but I didn't save it in my local bookmark of Teensy hacks until recently, when I saw somebody wanting the same thing with an LC (which doesn't have the reset pad). Since I was recently wiring...
I suspect it may be helpful to realize that the pin left of pin 12 is a 3.3v pin and the pin left on pin 13 is a ground pin. If you use appropriate pull-up or pull-down resistors and MOSFETs, you might be able to...
If you look at the bottom side of the 3.2, you can see a solder pad labeled 'RST'. If you solder a wire to that pad, and then connect that wire to ground, it will reset the Teensy.
...
Well there is the obvious form factor issues:
The back row pins on the 3.2 are in a different location than the middle row pins of the 3.5/3.6. Each of the LC, 3.2 and 3.5/3.6 have different pins in those 5 pin...
I just got my beta board, I tend to print various information at the start of my Serial USB output, including the serial # and ethernet address that FrankB's teensyMac returned. Unfortunately, it looks like the...
I am a computer programmer that has worked on compilers for over 33 years. I have been working on the GNU GCC compiler for over 20. Outside of work, I tend to be known for my steampunk camera (see http://www.steampunkmike.org for more details).
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