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Description: The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. The Teensy 3.1 brings a 32 bit ARM Cortex microprocessor into the mix so you can do some serious number crunching.

The Teensy 3.1 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! On top of everything else the Teensy has been gifted with more RAM (64K, thats 4x more than the Teensy 3.0) and 256kb of flash memory! The Teensy 3.1 now has 5V tolerance on its digital inputs however all analog-only pins are still 3.3V only. 

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)
  • 4 general purpose DMA channels (separate from USB)
  • Touch Sensor Inputs


Comments 27 comments

  • Am I reading that right? 32x the ram of an Arduino Uno?

  • Hi! can I put 9 volts in the pin VBat to power the board? or I have to use a 5 volts regulator in the pin Vin to power it?

    • No, don’t do that!

      VBat is meant only for a 3V coin cell, and only to keep the RTC’s time counting while power is removed. It doesn’t power the whole board, only the RTC. Of course, the RTC only works if you add the 32.768 kHz crystal.

  • Just got mine today. This little dude is awesome!

  • Hi there, is this board using a Mini-USB or a Micro-USB. it looks like Mini-USB but I’m not sure when seeing the image, and no where this is mentioned.


  • Oh my gosh this is a cool chip. It has so many uses I could abuse it with. $20 for a nice nearly 100Mhz processor! Wow!

    Edit: Ooh, i just had an evil thought. Teensy 3.1 combined with the wifi processor of the Yun. That would be truly diabolical.

  • According to the teensy 3.1 is green and it has a 12 bit analog out. The image on this page seems to be a version 3.0. All the rest of the information seems to be up to date.

    • Check the page again, they mentioned they changed the Teensy 3.1 from black to green. This is an image of the Teensy 3.1 we have in stock. I’ll make sure we get new pictures when we get the green ones in.

  • This board is by far more superior than Arduino. I’ve been using Teensy++ and was very impressed with it’s feature to become a Joystick at a click of a button! I’m using it to build a physical control panels for XPLANE simulators. their 64 Bit plugin for the simulator currently crashes on exit and is being worked on but the 32 bit is working just fine. More memory and pins at the same cost, using same Arduino IDE.

  • Has anyone tried to interface this with the 32x16 LED Panel, ? There is code written to interface it with the Arduino, but much of the library code is low-level and incompatible with the Teensy. I’d like to use the Teensy, because it provides enough power and memory that I need for doing animations and possibly other functions while running the display.

    • Maybe this will help?

  • You say that there are 4 DMA channels but there is actually 16 according to the datasheet

  • FINALLY! A really small, low cost and easy to use controller with enough RAM, flash and horsepower to do some interesting things with graphical displays!!

  • How does it compare with Atmel-based Arduinos on the power consumption?

    • Current measurements for 10 different boards, by “mantiou48”.

    • Here’s a message with quick/unofficial current measurements on the new 3.1 version.

      TL;DR = 32 mA at 96 MHz , 23 mA at 48 MHz , 15 mA at 24 MHz

      The speed is selected in Arduino using the Tools > CPU Speed menu.

  • This would be awesome to have in a higher pincount (teensy ++) package … or a breakout board to get at all the non-breadbord pins

  • Great!!! Go Paul!!!!

  • WOOHOOO!!!! On board DAC and 2 ADC’s!!!

  • I have a question in the description it says that there is a 72 MHz processor but in the picture it shows a 16 MHz clock is it really 72 MHz?

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