it can do floating point DSP calculations and has a DAC. That means basic audio processing! Also, USB hosting. So many features! so good!

It is like an Arduino, but just better. So you have all the good online examples of Arduino, plus other good examples for the Teensy. Serial communication seams more stable than Arduino, and midi support makes it WOW.

have been able to use in LED matrix and audio applications already. support added for the Arduino 1.6 IDE was quick after its release. Haven't found anything yet that I've tried that it won't do...

Don't buy anything else, this is the only choice!

Where do I begin? Easy setup (the fantastic Teensyduino package), 5V tolerance (I'm looking at you, Arduino Due/Zero), loads of power, basically unbrickable. DSP instructions means it can do FFT's (audio analysis!) without breaking a sweat. And if you want an interface, it probably has it. I2C, SPI, 3xUART, I2S, native USB, DAC, CAN, touch...

The multitude of Arduino's I have are simply not fast enough to drive a large RGB matrix display. Surprisingly this device not only worked like a champ using the Teensy Arduino IDE (and libraries), but it also has plenty of horsepower to drive the matrix display. I used both the smartmatrix library and the ENC28J60 library with no changes necessary. For the money its the fastest and easiest to use 32-bit arm board out there (given the vast Arduino lib's available).

This board is straightfoward to use, the microprocessor is very capable, and the PJRC website has made the learning curve as short as I could realisitically ask for. The primary sacrifice with the tiny size is the difficulty of connecting to surface mount pads on the bottom of the board. This is necessary only if you are pushing the limits of pin availability (i.e., running out of through-hole pins), however.

Using it as the brains for a Stepper Motor controller used for an Amateur Radio loop antenna. It allows the antenna to be automatically adjusted to wherever the radio is tuned. Cicuit design by Loftur, VE2LJX.

I am using the Teensy 3.1 in three new modules for my Moog format music synthesizer. One module allows hosting USB devices such as keyboard controllers and MIDI controllers without a computer. The second uses a Teensy 3.1 and a Teensy audio adapter board to provide high quality audio I/O from the synth to a digital audio workstation. The third module combines a Teensy 3.1 with a WAV Trigger board to provide a standalone sample player triggered by sequencers or MIDI sources.

I saw the 32x32 panel and the teency and had to get them! I had to upgrade to Teensy 3.1 for the Arduino,(No problem with the (i think it was PJRC fourums)). I was looking do do a FIRDSP filter and PJRC helped me with setting up the Teensy and I have the ADC Library working (thanks MXXX). I am happy with the ADC and DIO. Now to the 32x32 LED panel. I saw the SmartMatrix shield from Adafruit and installed it per:http://dangerousprototypes.com/forum/viewtopic.php?f=56&t=6125&p=56311. after over a week of struggles, I just got it to work special thanks to the forum guys of PJRC: MXXX, sevech, embedded-creation and Nantonos! getting the correct lib files from the correct people a real pain.

Lots of RAM. Fast Cortex MCU. 5 Volt Tolerant digital inputs. Great price. Avoids arduino politics.

Could use more shield-like ecosystem, this will certainly come.

I am using teensy to provide telemetry to my Taranis radio. I love the multi-functionality of this little board.Now I can monitor my Quadrocopters in flight systems without worrying.I highly recommend. Teensy 3.1 for this type of project. Thanks Sparkfun!

This board occupies some important middle ground between Arduinos and things like a Raspberry Pi. A very good value for the price. If you find yourself bumping up against the RAM limits of an Arduino, try this.

My Teensy stopped working wery soon. I don't find cause. I descirbed my probrem here: https://forum.pjrc.com/threads/28579-Teensy-3-1-is-not-running-program?p=72577#post72577

Use Teensy as interface board from Taranis Receiver to Pixhawk flight controller. This is my 3rd one and they all work great!

I just finished assembling a Planck, and I used the Teensy 3.1 as a controller. The Teensy was super easy to work with and it runs great

The power of the teensy and all its pins made it easy for my team to make a robot for the ASEE competition in Seattle. We originally planned to make a swarm of our bots but when our lab flooded we just focused on the one that was running and in the end we took second place in the national competition. While everyone else used a mega and didn't have working robots our teensy and its power gave us the advantage to win. I think that next year more people will be using a teensy at ASEE.

Very easy to setup and get working, accessible large Arduino libraries. Powerful for it's size with lots of inputs.

Everything you can do with XXXduinos, this does it faster. Tons of hidden perks: adjustable PWM, internal PGAs on the ADCs, tons of pins.

Only thing I could possibly complain about it the fact the reset pin is surface mounted below the board. There is a nice breakout board available (if not here, on tindie) that solves that but I have not bought one yet.

The K20 is a nice processor with a decent ADC. I got the Teensy 3.1 to port the PteroDAQ data acquisition system to it: https://bitbucket.org/abe_k/pterodaq/wiki/Home

The porting was pretty easy with the Teensyduino IDE, which provided a good enough USBserial implementation (half the size of the MBED implementation).

I've not yet taken advantage of all the features of the Teensy 3.1 that are relevant to PteroDAQ, because I'm concentrating more on adding functionality that can be shared with the Teensy LC and the FRDM-KL25Z boards (which PteroDAQ also supports, along with many of the Arduino boards).

It's a little strange not having a reset button on the board (have to power cycle to reset), but that hasn't been a problem so far.

I've soldered male headers on the bottom for breadboard use, and 1x5 and 1x3 female headers on the top, but that still leaves 14 pins inaccessible (surface mount pads on the bottom of the board), including the second differential ADC channel.

I'm planning to use the Teensy LC, rather than the Teensy 3.1 for the data-acquisition board in my applied electronics class this Spring, because the LC is half the price and (so far) none of the extra features of the Teensy 3.1 have been worth the extra price in this application. The higher speed is not of much use to me, since the ADC speeds are the same, and my application is limited by the ADC and by communication to a Python program on the host, not by the microcontroller processing power.

(My opinion may change if I can get the programmable gain amplifiers integrated into PteroDAQ or figure out a way to make good use of the second ADC.)

Neither Teensy board has as nice peripherals as the FRDM-KL25Z board (accelerometer, RGB LED, and touch slider), but the Teensy boards are good for incorporating onto breadboards, which makes them easier to transport and wire up than having to run jumper wires to the female headers on a FRDM-KL25Z board.

If you don't need to hook up Arduino shields, the Teensy 3.1 and Teensy LC boards offer much better value for the money than any of the Arduino boards, and the Teensyduino enviroment has a much gentler learning curve than most of the other ARM development systems.

Powerful capable CPU, easy to work with, affordable, lots of great peripherals. I expect to be using this for a lot of projects over the coming years. Great for applications too big for 8-bit Arduinos where you don't want to run Linux.

An amazing product!

I used the processor time ago, this very well assembled. Support for this device is very good, Paul is a great developer and quickly responds to technical problems.

Its fast, its arduino like, its small, its cheap, there is good support, there are lots of libraries, some compatible hardware, 3.3v what's not to like.

I have used about 10 of them in projects ranging from motor controllers, IMU's, led controllers, user interface controllers, audio controllers, etc. All are radio linked through XBee.

I really have liked this board so far! The higher res ADC is great, the ad-ins to the Arduino IDE are very intuitive. The only con is there is not a great list of functions that work on it for example "analogReadResolution()" works on this board, but you have to dig in forums to find that out. I would recommend this to someone that is already proficient with Arduino.

I have used the Teensy 3.0 and 3.1 on a couple of projects. A temperature controller and a SI4735 radio chip controller. It is easy to use for the following reasons: 1. Uses a more powerful processor with more I/O, both digital and analog. It also has more memory for larger programs. 2. The Teensyduino software is well thought out and is constantly being improved. This is especially true for software routines from other vendors. 3. Also I like the smaller size compared to the original Arduino Uno.

I quickly built a "Teensy" data acquisition system that communicated with three serial pressure sensors, five analog vacuum gages and one analog temperature sensor. I had never used the teensy before, but using the Arduino IDE (1.05) with the teensyduino software from pjrc made it as simple as using an Uno while giving me more capability. Three hardware serial ports, tons of memory and high processing speed (96 MHz!) makes this tiny little board rock!

As an owner of several Teensy 2.0 plus a few 3.0's and 3.1's (and a multitude of other AVR-based boards), I can safely say that this is the most capable board in its price range that I've come across. The sheer volume of features available, the number of I/O, miniscule size, and the raw processing power of the microcontroller all come together to make this an incredible value while still somehow managing to be easy to use. The Teensy series have become my go-to boards for small-to-medium projects, especially since 3.1 was released with 5v tolerant I/O. I can't speak for the Arduino IDE integration as I use WinAVR, but I've heard it's quite seamless.

Sparkfun. Good all service....

I use this board to run a complicated program for a maze solving robot. It runs the algorithm perfectly, and there are plenty of pins for sensors. The interrupts are also very useful for motor encoders. This is all around a great board. I would recommend it 10/10.

First, its small size and faster RAM make this a must for the hobbyist looking to shrink his/her projects down to a few sizes. Much easier to use than some of the other pint-sized alternatives on the market.

very impressive. difficult to find a project that this wouldn't be your best option unless it proved to be an overkill. i was looking for this for quite a while.

It has stopped working for me, but I think this is more do to my own error rather than the teensy.