August 24th, 2009

Becker Unilink

Becker Unilink

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]

August 22nd, 2009

Atmel based Sony Unilink

Atmel based Sony Unilink

The Sony Unilink protocol is usually meant to control the CD-player of an automobile and can also perform other various tasks. The Sony Unilink protocol can be used to connect other auxiliary devices to your car stereo (these devices vary from CD shuttles to iPods).

This project is an AVR Sony Unilink interface based on the Atmel ATmega8 microcontroller. The MCU runs at 7,3728MHz and the communication with the Unilink bus is made through Serial Peripheral Interface (SPI) and the software supports RS232 input and output. The source code was written in C and the files as well as schematics are available for download under GNU General Public License in the link below.

(Another Unilink interface project entitled GNUnilink, based on the PIC16F628 running at 10MHz is also presented under GNU License).

Atmel based Sony Unilink: [Link]

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