DEV-12887 datasheet(21/40 Pages) SPARKFUN

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}

else

{

hardware.pin1.write(0); // Write pin 1 low LED off

}

// This must be called at the end. This'll call loop() aga

in in 10ms, that way it'll actually loop!

imp.wakeup(0.01, loop);

}

////////////////////////////////////////

// Setup Stuff: Runs first at startup //

////////////////////////////////////////

hardware.pin1.configure(PWM_OUT, 0.0005, 0.0); // Configure

Pin 1 as PWM output, 5ms period, 0% high (off)

hardware.pin5.configure(ANALOG_IN); // Configure pin 5 as anal

og input

hardware.pin9.configure(DIGITAL_IN_PULLUP, pin9changed); // Co

nfigure pin 9 as digital input (with pullup enabled). On chan

ge it'll call function pin9changed().

imp.configure("LED Trigger Wiper", [], []);

loop(); // Call loop, and let the program go!

The code creates an adjustable-brightness LED controller. The brightness

of the LED is adjusted by turning the potentiometer. Pressing the button will

turn the LED on and off.

Explaining the Code

The skeleton of this code acts a lot like that of Hello, blink. The function

definitions are up top, the setup stuff runs at the bottom, and loop() is

called at the beginning. loop() continually calls itself, using the

imp.wakeup(0.01, loop) function call, every 10 ms.

The loop() function again relies on an ledState variable. If ledState is

1, we read the potentiometer voltage, and adjust the brightness of our LED

accordingly.

The ledState variable is flip-flopped in the pin9changed() function. This

is like an interrupt. It’s called whenever the state of pin 9 changes – if it

goes from high to low, or low to high. When setting up pin 9 as a digital

input, we added this function as the one to be called when the state change

occurred.

Check out the comments in the code for a more in-depth overview of each

function call. Or, for more information, check out Electric Imp’s API

reference.

Enough hardware stuff! The next two examples will make use of the imp’s

greatest feature…it’s web connectivity.

Example 2: Web Control (Request)

Some of the most fun you can have with the imp is connecting it to the

Internet, and interfacing it with web pages. In this example, we’ll use a

simple HTML/Javascript web page to control some LEDs connected to the

imp.

This time, we’ll not only be writing code for the imp, but the agent as well.

This example code will show how to pass data from the imp to the agent,

and how to write a simple web page to interact with the agent half of the

code.

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