There are some resources explaining how to leverage the jack audio port from the Raspberry Pi 2, 3 and 3B+ to make a neat and nice power on/off button. However this doesn't work for the Raspberry Pi 4B.

This post explains the general concept behind it, why it doesn't …

In order to compile the g729 codec for a Raspberry Pi B+ (ARM processor), the fastest way is to build it with the bcg729. The bcg729 is a software encoder for g729a and decoder library written from scratch.

The resulting codec will be x2 slower than if it has been …

It is possible to build a small unexpensive box for making and receiving GSM calls and SMS. It is possible to i When travelling outside the country, it is interesting to be reachable and be able to perform outgoing calls through VoIP without paying roaming fees. A Raspberry Pi can …