The Digital Green Certificate (sometimes named green pass) is a digital certificate, common throughout Europe, which proofs that a person: is vaccinated against COVID-19 received a negative test result recovered from COVID-19 It’s normally issued as a qrcode, to speed up its reading by checking apps. On a technical level, the personal information of the…
Pi Zero is a small board – part of the Raspberry family – designed for embedded applications where space is a constraint. The low cost (about 10€ for version W, with wifi connectivity) and the ability to run different operating systems makes it the ideal choice for different applications (media centers, data loggers…). Raspberry Pi Zero unfortunately doesn’t offer a dedicated audio…
After having brought a Raspberry Pi Zero, I asked myself how to access it and do some initial configuration because of in that moment I hadn’t an HDMI monitor or an USB keyboard and a mouse. Fortunately, this Raspberry model supports USB OTG (On The Go): it can “become” a slave USB device such as a…
If two devices have to talk to each other, they must adopt the same protocol. In the past, I’ve already shown different types of communication, for example between Arduino and a C# program, Arduino and a website or Arduino and an NTP server. All those communications are point-to-point ones, that is between two actors. Today I’m instead going to introduce you…