User Manual

2/8/2018 Teensy Loader app for Macintosh OS-X

https://www.pjrc.com/teensy/loader_mac.html 1/3

Using The Teensy Loader on Mac OS X

Update: Teensy 3.0 is supported by Teensyduino. After installation, Teensy Loader is in hardware/tools. It is run

automatically when using Verify or Upload within the Arduino software. This version on this web page has not

been updated for Teensy 3.0. Please install Teensyduino to use Teensy 3.0.

Files to download:

Teensy Loader Disk Image (3.5 megabytes, Mac OS X 10.7 and later)

LED Blink, Both Slow & Fast

When you open the disk image, it contains 1 item, the Teensy Loader application.

You may copy the Teensy Loader to your hard drive, perhaps even add it to your dock. But it will run perfectly

directly from the disk image, so just double click it.

Yes, the Teensy Loader is safe, so click Open.

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2/8/2018 Teensy Loader app for Macintosh OS-X Using The Teensy Loader on Mac OS X Update: Teensy 3.0 is supported by Teensyduino. After installation, Teensy Loader is in hardware/tools. It is run automatically when using Verify or Upload within the Arduino software. This version on this web page has not been updated for Teensy 3.0. Please install Teensyduino to use Teensy 3.0. Files to download: Teensy Loader Disk Image (3.5 megabytes, Mac OS X 10.
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/8/2018 Teensy Loader app for Macintosh OS-X The Teensy Loader should appear as a small window. If the Teensy board is running the LED blink, or not connected, you should see this window. If HalfKay is running, you should see this. If not, simply make sure your Teensy board is connected, and press the pushbutton to run HalfKay. The Teensy Loader will quickly recognize it. From the File name, choose "Open HEX File" and open blink_fast.hex, which you downloaded using the link at the top of this page.
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2/8/2018 Teensy Loader app for Macintosh OS-X To try Automatic mode, simply click the "Auto" button, or choose "Automatic Mode" from the Operations menu. The Auto button should illuminate bright green. Then, open the slow LED blink HEX file. When you press the button on your Teensy board, Automatic Mode will quickly program and reboot your board. Normally, while working on a project, you can leave the Teensy Loader in Automatic Mode.