dop2000:
Looks like Sony wired remote works on the same principle, but the resistance values might be different.
Here is the diagram of Sony RM-X4S remote I found:
More information here:
panuworld “steering wheel remote control stalk adapter„You can also try modifying the sketch to cycle through all 128 steps on the digipot and see if it triggers any functions on the head unit.
dop2000:
Looks like Sony wired remote works on the same principle, but the resistance values might be different.
Here is the diagram of Sony RM-X4S remote I found:
More information here:
panuworld “steering wheel remote control stalk adapter„You can also try modifying the sketch to cycle through all 128 steps on the digipot and see if it triggers any functions on the head unit.
Hi! I´ve just signed up just to say thank you!
Ive succesfully connected my 2012 Toyota RAV4 steering wheel to a Sony XSP-N1BT using your diagram and the arduino code posted here.
The key to success is merely visible in the diagram posted by Dop2000, The key is that you need to open the circuit during standby mode in order to give the signals correctly.
The difference between the Pioneer remote control is that Sony´s remote control circuit is always open until you press a button.
For doing that, i've included a 6v relay switch connected to pin 9, so every time I send a value to the digital potenciometer, I have to send afterwards a high level to pin 9, while the button is pressed, so when the button is released (and the "switch" line code selects for nothing and value "0" is sent to the potentiometer) you send a "LOW" level to pin 9
It works great! I will include te code for this later on. Ive got some comments in spanish and my code is still a bit messy.
I could have used something different instead of a relay switch, even an optocoupler or a transsistor, but I don't have much experience and knowledge in electronics and every time i tried using one of these the resulting resistance was modified and nothing worked. Maybe I needed to add some other metal-sillicon based "bugs", but instead of all that, it works.
For the Arduino and hardware, i used a cell phone charger module (12V to USB 5V 1A) connected to ignition cable on one side so Arduino nano turns on when i turn the key on and the stereo goes on. (so it won´t be on the whole time) On the other side, usb cable directly to Arduino´s USB.
Thanks to everybody, greetings from Argentina, I will be posting code and diagram in a few days.