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Step 3Program
Once you have put the circuit together you need to program the microcontroller with the attached program. Because build environments can vary wildly based on you choice of operating system, programmer, and software, I won't get into setting that up here (For some help, you might want to check out Ladyada's page on this topic). For the purposes of this tutorial I'll assume you are using the same sort of setup in the above link, the USBtinyISP programmer, and a linux (or unix-like) operating system. If you are using a different setup (especially if you are using a different programmer) you will likely have to edit the Makefile (again, too much to get into here, try reading the comments in the file).
Once you have everything set up, and the programmer attached, it's time to program. I have found that the speaker can't be attached while programming, so you should unhook that for this step. It is also very important that the crystal be attached (along with the 2 18 pF capacitors), as it will become necessary after burning the fuses.
DO NOT perform the next step (burn-fuse) if you are not using the crystal, once you do the AVR will require a crystal to operate. If you burn the fuses and you don't have a crystal your out of luck until you can get one.
Now, we need to burn the AVR's fuses (see a tutorial on AVR's for more information, and the above warning). To do so, run this command from within the same directory you have the files: main.c and Makefile.
make burn-fuse
If you are programming this thing some other way, the fuse values are:
lfuse: 0xFD
hfuse: 0xDF
Next run the next two commands to compile the program and program the AVR:
make
make program
If you want you can run this command to clean up the excesses files that were created by the make command:
make clean
And there you go! Hopefully there weren't any errors and your AVR is programmed and ready to go. By default the AVR will wait for 15 minutes before doing it's thing, then beep for 1 second every 10 minutes for an hour. The beep frequency will be 17 KHz (quite high pitched). Check out the main.c file for more information and to change these values. I made sure to add lots of comments.
Once you have everything set up, and the programmer attached, it's time to program. I have found that the speaker can't be attached while programming, so you should unhook that for this step. It is also very important that the crystal be attached (along with the 2 18 pF capacitors), as it will become necessary after burning the fuses.
DO NOT perform the next step (burn-fuse) if you are not using the crystal, once you do the AVR will require a crystal to operate. If you burn the fuses and you don't have a crystal your out of luck until you can get one.
Now, we need to burn the AVR's fuses (see a tutorial on AVR's for more information, and the above warning). To do so, run this command from within the same directory you have the files: main.c and Makefile.
make burn-fuse
If you are programming this thing some other way, the fuse values are:
lfuse: 0xFD
hfuse: 0xDF
Next run the next two commands to compile the program and program the AVR:
make
make program
If you want you can run this command to clean up the excesses files that were created by the make command:
make clean
And there you go! Hopefully there weren't any errors and your AVR is programmed and ready to go. By default the AVR will wait for 15 minutes before doing it's thing, then beep for 1 second every 10 minutes for an hour. The beep frequency will be 17 KHz (quite high pitched). Check out the main.c file for more information and to change these values. I made sure to add lots of comments.
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