What is going on in our program? We should understand a few concepts about our seemingly simple RGB LED and button program that are crucial in embedded systems. Note that when you reach the maximum brightness, the intensity resets to 0. You should be able to press any of the 3 buttons on your breadboard to increment the red, green, and blue intensity of the LED.
bin file on the mbed when you press the restart button, the mbed will choose the newest file to load and run. You can choose to delete the previous mbed_blinky_LPC1768.bin or just leave it there.
MBED WAVEPLAYER DOWNLOAD
Do nothing! We wait for an interrupt to happenĬlick the "Compile" button to download a binary file with your compiled program. Define three interrupts - one for each color Interrupt Service Routine to increment the blue color Interrupt Service Routine to increment the green color Read in current PWM value and increment it Interrupt Service Routine to increment the red color
MBED WAVEPLAYER CODE
The leads on the same side are only connected when button is pressed.Ĭopy the following code into main.cpp of your rgb_buttons project. The leads across each other on the pushbuttons are always connected to each other. Place the LPC1768 in the first breadboard with pin VOUT in position i1 and pin 20 in position b20.Ĭonnect the rest of the components as follows: Component
MBED WAVEPLAYER FREE
Feel free to use any color you like! Do not worry if your kit does not have 5 black wires. Note that the colors of the wires do not matter. In the diagram, the flat edge (see the Tips section below) is facing to the left. listed in the header file.īe careful with the direction of the LED ( polarity matters!). As long as we include the header file and the header file and library are in our search path (for our mbed programs, just make sure that the library is copied into our project directory - shown by the little gear icon in this example), we can use the functions, constants, classes, etc. are defined in a separate library, and the header file provides an interface. Many times, the implementation of these functions, constants, classes, etc. mbed.h is a header file that declares a set of functions, constants, classes, etc. copy into our program) a separate file (mbed.h in this case) when we compile. The very first line in our blinky program is language:c You would need to reset the microcontroller to restart the program. It is possible to make the while loop exit, and the program would stop running. Notice that we explicitly put the loop code inside of a while loop. Much like in the Arduino example, the program executes the setup code once (as soon as it enters the main() function) and executes the loop code forever. Using our concepts of setup and loop, this is what the basic template looks like in mbed: language:c this is where the program begins execution when you run it). Every C and C++ program must have a main() function, as this is the entry point for the program (i.e. In mbed (and most other embedded systems), we must create our own setup and loop sections within main(). In Arduino, the setup code runs once, and the loop code runs forever. For example, you might see this in Arduino: language:c One thing you should be aware of is that Arduino wraps up the setup and loop stages into nice functions for you. If you have used Arduino in the past, it might come as a surprise that you were writing code in a language very close to C and C++. This is our first program with the mbed, so we should talk about what is going on. In the final project, we load some sound clips onto our SD card and use the mbed to play one whenever we push a button. Let's make some music! We can use pulse-width modulation (PWM) to control sounds out of a speaker or set of headphones. Want to see how the temperature varies over time in an area? We connect a temperature sensor and an SD card to the mbed to log temperature measurements. In addition to acting like a USB host, the mbed can also act like a USB device! This means that we can have it control the mouse pointer on our computer, for example. This means that we can connect things like keyboards to it.
Using an Ethernet cable, we can read the current time from an Internet server and display the time on our LCD. The LPC1768 has the ability to connect to the Internet. Using the accelerometer, we can interact with the mbed by tilting it in different directions.
MBED WAVEPLAYER HOW TO
We learn how to draw text and shapes on the LCD. The mbed kit includes a 1.44" LCD that we can make do cool things. Let's make some light! We use some buttons to control the colors of an RGB LED We setup the development environment and create our first program: Blinky!
You should start with Tutorial #1 in order to get familiar with and the programming environment. The tutorials! This is where you get to open your mbed kit and play with all those cool parts. Now for the part you have been waiting for.
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