Step 5: Track Skipping

Once your Sugru has cured it's time to wire up the controls. Starting with the track skipping switch because in my set up it is on the bottom.

To skip to the next  or previous track I am using a switch which rests in its open position (not making a circuit), which is only connected to pins 2, 3 and 4. When pushed to the left it connects pins 1, 2, 3 and 4, and when pushed to the right it connects pins 2, 3, 4 and 5. See Image 1 for clarification.

I have connected pin 3 to the extra earth cable I ran out the back of the stereo jack housing.
Pin 1 has a 220ohm resistor soldered on.
Pin 5 has a 620ohm resistor soldered on.
Both the resistors on pin 1 and 5 are then connected to the function wire coming from the back of the jack housing.

When I push the switch lever left it connects the function wire through the 220ohm resister to earth and the phone knows to skip back. When pushed to the right the function wire connects to the 620ohm resistor and to earth and the phone skips forward.
Nice design, but technically speaking this is not really a "inline" control. That would be where the controls are somewhere in the length of the cable. Hence "inline". What would be interesting to see is if you could run the cable to the steering wheel and have the controls there. I think this would be safer as both hands would stay on the wheel.
Inline control is any control of your media player (phone) which is on the audio cable. In this case the controls are at the end of the cable, but are still before the connector. Even if you ran more wire for the 4th pole and ground to put the buttons on (as you mentioned) the steering wheel it is still technically in line with the audio cable. <br> <br>While putting the controls on the steering wheel may be safer for use, having the cable long enough to allow full lock in both directions would require a fair amount of slack, this slack could inter fear with your driving and make it more dangerous than ever! The best solution for that would be to use a springy cord (think telephone cord) to keep it against the steering column. <br> <br>If you do decide to try that please do be careful with the cable, and make sure the controls on the wheel don't inter fear with your hands on the wheel.
very cool. i have an android phone and was hoping play/pause wasnt the only thing i could do.<br><br>im going to do this and mount the controls either on or by my steering wheel for easy access.<br><br>also, this shouldnt void your warranty since you arent modifying the phone in any way.
If you are planning to mount the controls on your steering wheel make sure you allow plenty of cable so you can turn to full lock without breaking the wires.<br><br>I've seen that the Samsung galaxy note comes with headphones with inline play/pause, track skip and volume controls. If you can get your hands on the headphones from one of those you could measure the resistance across the 4th pole when changing the volume and add that to your controls too.
I'm guessing that the volume control will be either one or two (ganged) pots simply attenuating the output, which is normally how they do it. IME just a single pot between the ground from the two outputs and the ground going back to the phone.<br> <br><br> <br>Please comment if it's actually signalling the phone.<br> <br><br> <br>Very nice instructable - Really useful but no CNC milling machines or laser cutters :). Thanks for taking the time to post it.&nbsp;
Actually I think the volume control would be the same as track skipping, a specific resistance between the 4th pole and ground for volume up and another for volume down. <br> <br>The inline volume control used in simple headphones does use pots to change the resistance on the speaker wire, and thus the volume, but the idea of inline volume control in this case would be to change the setting on the phone. The only way the phone is receiving and input from these controls is via the 4th pole on the jack. <br> <br>If I can get my hands on a headset with inline volume I will try to figure it out and post my findings, however it is fairly difficult to find them these days.
Check out:<br> <br>http://www.androidzoom.com/android_applications/tools/headset-volume-controller_jpyc.html<br> <br>The important bit seems to be:<br> <br>&quot;Turn your headset previous/next buttons into a volume controller while playing back music. Pause playback and you can skip tracks again.&quot;<br> <br>Not great, but do-able. They don't do anything convenient like providing a DC offset to power tiny circuits with, do they?<br> <br>Anyone got an oscilloscope?
Yarg - What happened to the formatting? <br>Sorry
I never thought about the volume, thats a good idea!
Cool, I didn't even know that this could be done.
I don't think many people do, the big manufacturers are all focused on Bluetooth accessories and simple things like this get missed!<br><br>Luckily it's not very hard to do your self.
Also don't forget to vote for it in the Car Audio competition if you like it!

About This Instructable




Bio: Trying my hand at everything...
More by RandomIdeaMan:Circular Saw Mitre Box DIY custom fit cat run Inline Media Controls for Mobile to Car Audio 
Add instructable to: