== You will learn ==

== You will learn ==

*Simple implementations of each type of timer

*Simple implementations of each type of timer.

*Tasks each timer can be used for

*Tasks each timer can be used for.

*Some functions in the timer libraries.

*Some functions in the timer libraries.

Again, we will have to change folders. We will create a new file for this tutorial, but let's create it in the same directory we've been working with, so type

Again, we will have to change folders. We will create a new file for this tutorial, but let's create it in the same directory we've been working with, so type

<code><nowiki> cd contiki-2.7/examples/rime </nowiki></code>

  cd contiki-2.7/examples/rime

into the terminal. For this tutorial, we will be modifying the example-broadcast.c file we have previously used, so type  

into the terminal. For this tutorial, we will be modifying the example-broadcast.c file we have previously used, so type  

<code><nowiki> cp example-broadcast.c example-timer.c </nowiki></code>

  cp example-broadcast.c example-timer.c

into your terminal. You should now see a new file, "example-timer.c" in your directory. Open it up with an editor of your choice (we will use gedit for this tutorial):

into your terminal. You should now see a new file, "example-timer.c" in your directory. Open it up with an editor of your choice (we will use gedit for this tutorial):

<code><nowiki> edit example-timer.c </nowiki></code>

  gedit example-timer.c

=== Step 2 ===

=== Step 2 ===

There is currently a working example of an etimer in this code, so before we proceed, let's understand this. At the beginning of the process, it is declared with

There is currently a working example of an etimer in this code, so before we proceed, let's understand this. At the beginning of the process, it is declared with