User Manual

2/8/2018 Teensy Loader app for Macintosh OS-X
https://www.pjrc.com/teensy/loader_mac.html 2/3
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. You can also open the file using the toolbar button, or using drag-and-drop onto the upper
portion of the window. When the file is opened, the filename and percentage usage of the Teensy's memory are
shown.
Select "Program" from the "Operations" menu, or click the Program button on the tool bar. The download should
be very quick, perhaps too fast to see a tiny progress bar appear, but you should see the "Download Complete"
message.
Choose "Reboot" from the "Operations" menu, or click the Reboot button on the tool bar. Your Teensy board
should immediately begin running the fast LED blink program!