When this app detects that your phone connected to your home network, it will automatically disables the PIN, then enable it again when you leave or disconnect. How to use this app? Install Unlock with WiFi app from Android Market (it is free) and run it. It will automatically detect your Wi-Fi network. Click ‘Add Network’ button to add your network. That is enough.

After you enter your password once while connected to your Wi-Fi network, you will not have to enter it again.

Note: An ad free, paid version of Unlock with WiFi is also available with more features. Download Unlock With Wifi (free)