I got bored of the wifi thing pretty fast and went out and bought a Parallax PIR sensor and a buzzer. I had a key pad I bought from Newark.com from my last MCU project. I am going to use the key pad to allow a person with the code to disable it.
Its not that loud because I had to stay below the 3.5 powerage level. Since anything above needs a transistor and I hate using those things. They are so confusing!!
Anyone else currently working on a MCU project?