Watchdog for Raspberry Pi

Maybe not all of you know that Raspberry Pi has an integrated watchdog timer. This can be really useful, especially when you need to leave your RPi unattended for some time.

For those who doesn't know what is a watchdog, let's see just a small explanation...

Immagine that you made an incredibily wonderful home surveillance system and you are going to use it to check your house during an long trip abroad. After a bunch of days, something goes wrong and your system hangs, so it become unuseful. The only way to solve this problem would be to reboot the system, but you are away from it...

Watchdogs do this reboot for you.

Using AirPlay with Raspberry Pi

AirPlay is an Apple protocol which allows wireless streaming of audio, video, photo and so on. Even if it's a proprietary protocol, it can also be used with Android devices or personal computers by installing simple apps.

Of course you can also install AirPlay on a Raspberry Pi.

When I built my Sphaera, I also added an external audio card, an audio amplifier and a speaker. Initially I used this audio system just for some notification, but going from that to a wireless speaker it really easy.

Launch Python script at boot

Sometimes we could need to start a Python script when Raspberry Pi boots up in a full autonomous way.

RPi could be really useful if used headless, without a direct user interaction (at least when starting the system), so if we created a script for a RPi that needs to be executed at startup, we also need a way to accomplish this task.

In this post I will describe a way to execute a Python script (but this works also for every other kind of software) when booting the RPi.