Finding Software and Configuring Teensyduino

The link for software and docs for the Teensyduino IDE additions requires a bit of hunting. To download the software, go to Teensy developer site. The Arduino IDE must be installed first, and the folder and path must remain at default locations for the Teensy installer to work properly on Mac or Windows.

As of this post, the software was recently updated for both Teensy (1.2.4) and Arduino IDE (1.6.2 -  1.6.5), and they are in sync.  (Before this, the 1.5.x couldn't be used with Teensy; used the 1.0.3-5 branch of IDE.)
(Update 10/2017: Using Arduino 1.6.11 & Teensyduino 1.30)

Arduino (IDE) Software

Teensy Add-ins Software     Teensy 3.1 Pinouts

I've installed successfully on Mac and Windows; some notes on the Mac installation:

The Teensy installer shows a particular path on Mac OS  /Applications/Arduino.app/
Though it may appear selected, click on it once to activate the Next button.
Be sure that the version of the app is a valid one (shown on its start screen). It also lists 1.0.6, but that one wouldn't complete the install on my system, reporting a missing file pde.jar.


Docs reference the installation of the FTDI serial driver, but I did not need to for my Mac running OSX 10.10.
Get Teensy boards direct from developer (pjrc.com) or from distributors including ameridroid.com located in California.

An example

Here's a "Blink" program that uses the millis() instead of the delay(). Offers flexible timing and is non-blocking

const int led_pin = 13; // 13 on uno, mega, T3.1; pin 11 on teensy 2

void setup() {
   pinMode(led_pin, OUTPUT);  // don't forget to set pin mode!
}

void loop() {
  int t = millis();
  if (t % 500 ==  0) digitalWrite(led_pin, 1); // LED on every half second
  if (t % 500 == 60) digitalWrite(led_pin, 0); // LED off a little later
  // Can do other stuff in the meantime
}