Car Audio Steering Wheel Control interface using Arduino.
Requires AceButton https://github.com/bxparks/AceButton
Ford BA / BF Steering Wheel Control Adapter for Pioneer Stereo
The bulk of this has been built off the knowledge found in the following articles and forum posts;
http://www.jvde.net/node/7
https://forum.arduino.cc/index.php?topic=230068.0
This should work on Pioneer head units (Single DIN) that deliver both 5V & 3.3V via the Wired Remote input.
NOTE : The 3.3V circuit on an Arduino is ONLY available when the unit is powered via USB. If it is powered via VIN then a 5V power line to the digipot will work on a Pioneer that delivers 3.3V via the WR.
I recommend leaving the USB free for debug / programming whilst installed in vehicle and power the unit via another source.
Current button configuration:
| Function | Button | Action |
|---|---|---|
| Volume Down | VOL- | Press & Hold |
| Volume Up | VOL | Press & Hold |
| Next Track / Program | Seek | Press |
| Previous Track / Program | Seek | Double-press |
| Play / Pause* | Seek | Long-press |
| Source | Source | Press |
| Hang-up | Source | Double-press |
| Voice Control | Source | Long-press |
- Play/Pause only operates in APP mode on the Pioneer
Digipot values to Pioneer functions (Pioneer MVH-S305BT)
| Function | Resistance | Digipot Value | Time | Plug |
|---|---|---|---|---|
| Volume Up | 16k | 33 - 46 | 50ms | Tip |
| Volume Down | 24k | 47 - 72 | 50ms | Tip |
| Track / Seek | 8,2k | 17 - 22 | 50ms | Tip |
| Track - / Seek - | 11,25k | 23 -32 | 50ms | Tip |
| Source | 1,2k | 1 - 5 | 50ms | Tip |
| Power | 1,2k | 1 -5 | 1000ms | Ring |
| Band | 62,75k | 88 - 212 | 50ms | Ring |
| Play / Pause | 62,75k | 88 - 212 | 50ms | Tip |
| Display | 5,75 | 12 - 16 | 50ms | Tip |
| Mute | 3,5 | 6 - 11 | 50ms | Tip |
| Voice Control | 6,7k | 98 - 232 | 1000ms | Ring |
| Hang-up | 5,5k | 14 | 50ms | Tip |
Note, Band in some modes can result in Play / Pause and Voice Control is dependant on Pioneer model and mobile phone
Version 0.1 08/08/2020
Complete test in vehicle, all but previous track and power off functioning
Version 0.2 08/08/2020
Altered to catch release instead of press and supresss click to catch double-click
Version 0.3 09/08/2020
Cleaned up volume trigger, reset track -/ trigger
Version 0.4 29/08/2020
Introduced dual digipot commands for tip & ring triggers, this enables BT phone commands
Version 1.0 11/10/2020 Final wire with power via VIN, step-down to ~ 7.5V. Re-calibrated virtual buttons as they were a bit off due to the new power source, I assume
Version 1.1 25/20/2020 Optimised button timing
Version 1.2 02/11/2020 Adjusted digipot value to reduce bleed into next function - seek & volume
Version 1.3 11/12/2020 Included Longhold and Release for VOL /- and minor changes with move to AceButton 1.8
Version 1.4 1/11/2023 Re-calibrated the ladder, disabled a couple of functions due to moving head unit to a Pioneer SPH-DA306DAB. Will re-learn functions soon.