Let's take your FRDM-K66F for a test drive! You have the choice of watching the sequence in a short video or following the detailed actions list below.
Your FRDM-K66F comes loaded with a "bubble level" demo that leverages the on-board accelerometer. When the board is flat, the RGB LED is turned off, and when the board is tilted, the green or red LEDs gradually illuminate based on the degree of tilt on the X- and Y-axis.
The MCUXpresso SDK is complimentary and includes full source code under a permissive open-source license for all hardware abstraction an peripheral driver software.
Click below to download a pre-configured SDK release for the FRDM-K66F
You can also use the online SDK Builder to create a custom SDK package for the FRDM-K66F using the SDK builder.
NXP offers a complimentary toolchain called MCUXpresso IDE.
Want to use a different toolchain?
The MCUXpresso Config Tool is an integrated suite of configuration tools that guides users in creating new MCUXpresso SDK projects, and also provides pin and clock tools to generate initialization C code for custom board support.
The MCUXpresso Config Tools are integrated within the MCUXpresso IDE, if using MCUXpresso IDE, no additional download is needed. If using another toolchain, please consider downloading the config tools here.
Many of the example applications output data over the MCU UART so you'll want to make sure that the driver for the board's virtual COM port is installed. Before you run the driver installer, you MUST have the board plugged in to your PC.
With the serial port driver installed, run your favorite terminal application to view the serial output from the MCU's UART. Configure the terminal to 115200 baud rate, 8 data bits, no parity and 1 stop bit. To determine the port number of the FRDM-K66F's virtual COM port, open the device manager and look under the "Ports" group.
Not sure how to use a terminal application? Try one of these tutorials:
The MCUXpresso SDK comes with a long list of example applications code. To see what's available, browse to the SDK boards folder of your SDK installation and select your board, the FRDM-K66F (
To learn more about specific example code, open the readme.txt file in an example’s directory.
If one or more of the example applications sound interesting, you're probably wanting to know how you can build and debug yourself. The Getting Started with MCUXpresso SDK provides easy, step-by-step instructions on how to configure, build, and debug demos for all toolchains supported by the SDK.
Use the guide below to learn how to open, build and debug an example application use the MCUXpresso IDE.
Using a different toolchain?
Option A: Use the MCUXpresso IDE to clone an example project.
Option B: Use the MCUXpresso Config Tools to clone an existing MCUXpresso SDK example for use with third party IDEs.
Now, let’s use the Pins tool that is part of the MCUXpresso Config Tools to show how to add a new GPIO pin to your project to blink an LED.
Next use the Clocks tool that is part of the MCUXpresso Config tool to change the clock settings and change the rate that the LED blinks.
With the application modified, you will see the FRDM-K66F’s blue LED slowly blinking. You can also view terminal output using the terminal program.
Explore beyond the FRDM-K66F by adding other NXP solution to your project and interact with our worldwide design community
Explore the world with a full assortment of NXP sensor solutions. From accelerometers, pressure sensors, touch sensors, and many more, NXP had a sensor solution for your project. Find out more at http://nxp.com/sensors
Near Field Communication is a simple, intuitive technology that lets you interact securely with the world around you with a simple touch. Learn more about NXP’s NFC solutions at http://nxp.com/nfc
Connect with other engineers and get expert advice on designing with Kinetis MCUs and MCUXpresso Software and Tools. Join the community discussion in one of our two dedicated communities: Kinetis MCU Community or MCUXpresso Software and Tools Community