Yesterday I wrote an article about an Atmel based Sony Unilink interface and today it’s another Unilink project, this time based on Becker car radios. For those who do not know, Becker is an important manufacturer of car radios and car navigation devices and it’s based in the UK. Becker made the first car radio, the first microcontroller car radio and the first car radio with CD player and has quite a lot of other achievements.
Becker’s version of the Unilink protocol is very similar with Sony’s in terms of hardware, but different in software. The good thing about this is that you only need a different connector and source code with Becker support. The model presented here is a Becker Monza 7882, a European model, with two DIN-ISO connectors and a Mini-ISO connector field (the picture above illustrates the pinout for this model, you will also find the complete pin listing and additional information).
The MCU used is the ATmega8 from Atmel and the schematics are available for download. The source code was written in C and is also available in the link below (there is a logger only version, an interface version and a modified source code for Becker Mexico 2330). The files are released under GNU General Public License.
Becker Unilink: [Link]