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Teensy 3.1 has the same size, shape & pinout; is compatible with
code written for Teensy 3.0, and is well supported on the Arduino IDE
using Teensyduino. Teensy 3.1 adds several new features, due to an
upgraded microcontroller. Here are the highlights. A table of technical
specifications is show below.More Memory For Awesome Projects
RAM has quadrupled, from 16K to 64K. While 16K is plenty for nearly all
Arduino libraries, 64K allows for more advanced applications. Icons and
graphics for color displays and audio effects requiring delays, like
reverb and chorus, will become possible on Teensy 3.1. Flash memory has
also doubled, to 256K, and provides double the
memory bandwidth.5 Volt Tolerance on Digital Inputs
most new chips use 3.3V signals, but many legacy products output 5 volt
digital signals. These can now be directly connected to Teensy 3.1's
All digital pins are 5 volt tolerant on Teensy 3.1.
However, the analog-only pins (A10-A14), AREF, Program and Reset are
3.3V only.12 Bit Analog Output
Teensy 3.1 has a
proper analog output. You can always filter PWM, but true analog output
responds rapidly. The output is created by the stable reference voltage,
so it's doesn't vary if your power supply voltage changes slightly.Two Analog to Digital Converters
analogRead(), you can measure many signals, but only 1 at a time.
Teensy 3.1 has a second ADC, so you can concurrently measure 2 analog
signals. For stereo audio or power monitoring, sampling both left and
right, or voltage and current at the same moment is very beneficial.
PJRC is developing an advanced analog read function for Arduino, to make
using these new analog input capabilities very easy.CAN Bus
Controller Area Network is a communication used in automobiles. A new library to support Teensy 3.1's CAN controller is planned.Pinouts
Teensy 3.1 is meant to be a drop-in replacement for Teensy 3.0. Only 1 pin has different functionality.
The reset pin was replaced by A14/DAC, which you can use for true analog output, or as another analog input.Reset Signal
3.0 supported both a Program signal, to reboot into bootloader mode,
and a traditional Reset signal, for a conventional reboot that restarts
The Reset signal can be found on a new test point on the bottom side of Teensy 3.1.