Jon

sorry didn't realy understand you on that: "Try to not use pull-ups on your Raspi - just set SCL/SDA to Hi-Z. In opposite case you power the device's bus with extra 3,3V power. " can you clarify a bit its interesting I didn't break anything in the proces :) yet :) BTW: How would I check for sure which A or B pin is SCL or SDA can I do this with a multimeter?

are you sure that SCL is A and SDA is B, because whenever I try to connect my Raspberry PI B+ to the radio (did I mention that breadbord wires always fall out so its hard to make a solid connection without holding the wires and using at least 4 heands) its I2C pins are GPIO 2,4 like here: https://pinout.xyz/pinout/i2c# than I tried to set my raspberry pi as I2C slave according to this: https://raspberrypi.stackexchange.com/a/91438 but whenever I connect any pin to A/B terminal the radio becomes unresponsive...

Thanks decided to switch hardware a bit and will use Raspberry PI Model B+ which has 3.3V i2c and 512MB of RAM I am a bit confused on how to use WiringPi with I2C even after reading this: http://wiringpi.com/reference/i2c-library/ still don't know I connect A to SDA and B to SCL or vice versa?, do I realy need ground?, because according to your previus comment: " Just for you information - device do not take care of I2C slave NACKs - it sends data regardless of our acknowledgements or not acknowledgments."...

Thanks decided to switch hardware a bit and will use Raspberry PI Model B+ which has 3.3V i2c and 512MB of RAM I am a bit confused on how to use WiringPi with I2C even after reading this: http://wiringpi.com/reference/i2c-library/ still don't know I connect A to SDA and B to SCL or vice versa?, do I realy need ground?, because according to your previus comment: " Just for you information - device do not take care of I2C slave NACKs - it sends data regardless of our acknowledgements or not acknowledgments."...

OK Thanks as Seerduino is using this Microcontroller: https://en.wikipedia.org/wiki/ATmega328 and does not have USB, only serial out I was wondering do I have to read the whole EEPROM of my ATX909X out to ATmega328 as I have only 1Kb EEPROM on there or 2KB SRAM that could be problematic or I can for a first PoC only read the first Page of stationns on FM for instance? Thanks for Anwsering and Best Regards also which Port (A or B) does SDA/SCL map to in ATS909X? PS: do I have to use headphone jack...

OK Thanks as Seerduino is using this Microcontroller: https://en.wikipedia.org/wiki/ATmega328 and does not have USB, only serial out I was wondering do I have to read the whole EEPROM of my ATX909X out to ATmega328 as I have only 1Kb EEPROM on there or 2KB SRAM that could be problematic or I can for a first PoC only read the first Page of stationns on FM for instance? Thanks for Anwsering and Best Regards

using Seerduino (Arduino) as MicroController instead of PIC18