SparkFun will be closed for Memorial Day (5/30). Orders placed after 2pm MT on Friday (5/27) will process and ship out on Tuesday (5/31).

Creative Commons images are CC BY-NC-SA 3.0

Description: The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. Each Teensy 3.2 comes pre-flashed with a bootloader so you can program it using the on-board USB connection: No external programmer needed! You can program for the Teensy in your favorite program editor using C or you can install the Teensyduino add-on for the Arduino IDE and write Arduino sketches for Teensy!

The processor on the Teensy also has access to the USB and can emulate any kind of USB device you need it to be, making it great for USB-MIDI and other HID projects. The 32 bit processor brings a few other features to the table as well, such as multiple channels of Direct Memory Access, several high-resolution ADCs and even an I2S digital audio interface! There are also 4 separate interval timers plus a delay timer! Oh yeah, and all pins have interrupt capability. Also, it can provide system voltage of 3.3V to other devices at up to 100mA.

All of this functionality is jammed into a 1.4 x 0.7 inch board with all headers on a 0.1" grid so you can slap in on a breadboard and get to work! The Teensy 3.2 adds a more powerful 3.3 volt regulator, with the ability to directly power an ESP8266 Wifi, WIZ820io Ethernet, and other 3.3V add-on boards that require a little more power. Additionally, if it is used within the Teensy 3.1 limits of operation, the Teensy 3.2 and 3.1 are interchangeable!

Note: This does not come with a USB cable, please check below for an appropriate one.

Dimensions: 1.4 x 0.7" (~35 x 18 mm)


  • 32 bit ARM Cortex-M4 72 MHz CPU (M4 = DSP extensions)
  • 256K Flash Memory, 64K RAM, 2K EEPROM
  • 21 High Resolution Analog Inputs (13 bits usable, 16 bit hardware)
  • 34 Digital I/O Pins (5V tolerance on Digital Inputs)
  • 12 PWM outputs
  • 7 Timers for intervals/delays, separate from PWM
  • USB with dedicated DMA memory transfers
  • 3 UARTs (serial ports)
  • SPI, I2C, I2S,CAN Bus, IR modulator
  • I2S (for high quality audio interface)
  • Real Time Clock (with user-added 32.768 crystal and battery)
  • 16 DMA channels (separate from USB)
  • Touch Sensor Inputs


Recommended Products

Customer Comments

  • Indeed per PJRC the Teensy 3.2 replaced the 3.1 as follows :: “The main change is an improved 3.3V regulator, to allow Teensy to directly power ESP8266 Wifi, WIZ820io (W5200) Ethernet, and other power-hungry 3.3V devices.” and “We’re specifying Teensy 3.2’s power output at 250 mA and the maximum voltage input at 6 volts”

  • The second paragraph says that the Teensy can supply up to 100mA - the bigger regulator is supposed to be able to supply 250mA https://forum.pjrc.com/threads/29774-Teensy-3-2.

    • Sparkfun: Please update - please edit the spec above: “it can provide system voltage of 3.3V to other devices …” - PJRC is “ specifying Teensy 3.2’s power output at 250 mA ” - that is the reason for newer Teensy 3.2 versus the Teensy 3.1.

  • The new dedicated regulator is the ONLY difference between 3.1 and 3.2. (Version 3.1 used the regulator that is built into the microcontroller.) They are otherwise identical, so there should be no compatibility issues if you are putting these into something designed for version 3.1.

  • Shirley: In terms of compatibility, evidently the pad for the reset pin changed location in the Teensy 3.2 compared to the 3.1 In addition, the pads for USB D-/D+ also changed location. Unless you actually use the 3 pads or use one of the third party shields that had a pogo pin to bring out the reset pad to a pin, it should not present a compatibility problem.

    RobBrownNZ, you might ask the same question at the forums at pjrc.com, which are the development forums for the Teensies.

  • I tried Teensy 3.1, and found that it didn’t reset reliably when it was powered straight from 3.3V (rather than from USB). Adding a capacitor on the reset pin helped but it still wasn’t 100%, and then I accidentally ripped the ‘R’ pad off the PCB and gave up on the board as a result. Has anyone else experienced unreliable resetting with these things? Any advice on how to improve it?

Customer Reviews

4.8 out of 5

Based on 16 ratings:

5 star
4 star
3 star
2 star
1 star

3 of 3 found this helpful:

Just Awesome

First, the specs and price on these little boards couldn’t be better.

But the main reason I love Teensy so much is that the “bootloader” is contained in a separate chip from the main MCU. The loader is placed in RAM from the secondary chip when you press the programming button, but otherwise isn’t even in flash on the main MCU.

This means that if you drop the Arduino stuff, you have access to 100% of the resources of the MCU completely under your control. That might not be your cup of tea, but it’s refreshing to find hobbiest dev boards unencumbered by hobbiest bootloaders.

1 of 1 found this helpful:


It’s a flexible and powerful board, with huge capacity and small size, for me it is the best option for make projects.

1 of 1 found this helpful:

Huge "bang for the buck"

MUCH faster than 8-bit AVR Arduino boards. I recommend combining the Teensy 3.2 with the Sparkfun Teensy shield board. The result can be used as a direct alternative to several Arduino models. The Teensyduino extension to the standard Arduino IDE is superb.

Not your grandfather's Arduino

My video review: https://www.youtube.com/watch?v=4AWbB15eiJY

Cheers Joe

Lots of memory, speed, and I/O

Everything this hardware hacker and professional software developer needs.

A Good One

Love it! Easy to use and code examples for interrupts are available. Unlike the Feather and SAMD21 which are just about useless except for blinking some LED’s.

Some distrib’s are spiking the price + 30% or more.

Amazing Little Board

I bought two of these to just for testing purpose and I’m impressed with their speed and features. I’m going to migrate my old Arduino Nano projects to this one :)

A single Teensy 3.2 is almost equivalent to six of my Arduino Nano (of course with some pros and cons).

Nice board, needs SWD connector

Really nice board, size, features, and processor. I need some kind of debug however so I need SWD connected. Had to put one on myself. I’d use board more but this is too much hassle. Especially since the SAM21D mini is about the same thing but with cortex M connector layout on the board.

Just as easy as an Arduino

I was up and running within minutes with Teensy. It’s also very cute.

Good upgrade

Teensy isthe ideal product for most of my projects. I’m happy to see this update and the possibility to work more easily with the ESP8266 wify module.

Great platform!

Cheap, powerful and easy to prototype!

Very Impressive

I am building an instrument which must log one analogue channel and one axis of acceleration at about 100 to 1000 samples per second (s/s) for about a day. It must fit inside a 1" diameter tube (batteries as well). I bought a Teensy 3.2 (I had previously used a Teensy LC), and Sparkfun Accelerometer, RTC and microSD cards. I also bought a couple of 400 mAHr Lipo’s and a charger/boost board.

I have it working and tested to 1k s/s and it could probably go about 10 times faster. It draws about 50 mA. There is plenty of room for data on the 16 GByte microSd.

My main problems were due the Arduino IDE or (more probably) my lack of understanding of it. I have been programming for 50 years and developing microprocessor systems for 40. But I am just starting to use the Arduino IDE. It seems It is much less powerful than Visual Studio, Eclipse, Netbeans or even PSoC Designer, all of which I have used in recent years. But there is a lot of sample sample code available with a little searching and it is all open for view. The Teensy board itself is very powerful for $20 and is physically small. It integrates well with other Arduino components and with the Arduino IDE.

Fast - loaded with IO

I’ve been using Teensy since the 3.0 kickstarter. I’ve rolled them out into several projects. They work well. They are well support with the Arduino Libraries. I recommend them.

Related Tutorials

Boss Alarm

March 30, 2016

Build a Boss Alarm that alerts you of anyone walking into your office and automatically changes your computer screen.