Steering Wheel Controls for CarPuter
#46
05-14-2004, 11:32 PM
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Re: Steering Wheel Controls for CarPuter
I think I figured out what the problems is. It is the usb converter.
It appears that the converter expects real joystick resistance values which are in increments of 10Kohm. The steering wheel control is either 0, ~200 and ~650 ohms which all produce current that is too high (and clipped). When I calibrate I get values between 5-7. While calibrating with three 20Kohm (20, 40, 60Kohm) resistors I get between 0-127.
Any ideas?
It appears that the converter expects real joystick resistance values which are in increments of 10Kohm. The steering wheel control is either 0, ~200 and ~650 ohms which all produce current that is too high (and clipped). When I calibrate I get values between 5-7. While calibrating with three 20Kohm (20, 40, 60Kohm) resistors I get between 0-127.
Any ideas?
#47
05-16-2004, 02:27 PM
Re: Steering Wheel Controls for CarPuter
I'm not sure I completely understand your problem, at least the calibration part... So when you were getting between 0-127, your circuit wasn't hooked up to the steering wheel controls, just to the resistors?
If the joystick adaptor won't read in the 1 ohm rather then k ohm range, there might not be alot you can do other then try a different gameport. I would have assumed that all joystick ports work relativly the same, but I guess the USB has something to do with it. Do you have any free PCI slots to throw an old PCI gamecard in?
If the joystick adaptor won't read in the 1 ohm rather then k ohm range, there might not be alot you can do other then try a different gameport. I would have assumed that all joystick ports work relativly the same, but I guess the USB has something to do with it. Do you have any free PCI slots to throw an old PCI gamecard in?
#48
05-16-2004, 02:55 PM
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Re: Steering Wheel Controls for CarPuter
When I got the 1-127 I didn't use the circuit, I just had a series of 20kohm resistors connected to pin 1 and I was touching pin 3 to the connections between them:
pin1- R1 - R2 - R3 - R4 - R5 -
pin3 | or | or | or | or |
When I did the same with a series of 200ohm resistors I got nothing over 7.
I have an open pci slit but I will have to get a different case if I had to populate it.
pin1- R1 - R2 - R3 - R4 - R5 -
pin3 | or | or | or | or |
When I did the same with a series of 200ohm resistors I got nothing over 7.
I have an open pci slit but I will have to get a different case if I had to populate it.
#49
08-07-2004, 11:27 PM
Re: Steering Wheel Controls for CarPuter
I got a couple requests to simply the circuit diagram for head unit less installs, so here it is without the relays to switch back to the radio.
318843-WithoutRelay.JPG
318843-WithoutRelay.JPG
#51
08-11-2004, 05:34 PM
Re: Steering Wheel Controls for CarPuter
Great work! I'm definitely going to be doing this on my install.
Have you considered sending the signal only to the computer and letting the computer determine if it should intercept or repeat the signal to the radio? I'm not aware of any port on the PC that can be used to send an analog voltage signal, but it might not be too difficult (for a sparky) to build a circut to send the appropriate signal to the radio. The software side could keep track of the system mode and only repeat the signal when necessary.
Just a thought. My couple of EE classes 18 years ago didn't qualify me to build the circut, but maybe some talented wire-head can give it a go.
Have you considered sending the signal only to the computer and letting the computer determine if it should intercept or repeat the signal to the radio? I'm not aware of any port on the PC that can be used to send an analog voltage signal, but it might not be too difficult (for a sparky) to build a circut to send the appropriate signal to the radio. The software side could keep track of the system mode and only repeat the signal when necessary.
Just a thought. My couple of EE classes 18 years ago didn't qualify me to build the circut, but maybe some talented wire-head can give it a go.
#52
08-11-2004, 08:01 PM
Re: Steering Wheel Controls for CarPuter
Well the circuit with the relays in it let me switch back to the radio when I want to use the steering wheel controls for it. I don't know what other benefit being able to send signals to the radio would have, my carputer takes care of everything that the stock head unit does.
You can get USB based digital and anlog I/O ports for the computer from various places like http://www.phidgets.com/ that you could probably use to send signals to the headunit, but figuring out what to send would be a project in itself. The only reason I didn't go with one of these devices for the steering wheel controls is they are kinda expensive ~$100 compared to the $5 is cost me to do this and it would still be just as hard to install and still require programming to get it work with the computer.
You can get USB based digital and anlog I/O ports for the computer from various places like http://www.phidgets.com/ that you could probably use to send signals to the headunit, but figuring out what to send would be a project in itself. The only reason I didn't go with one of these devices for the steering wheel controls is they are kinda expensive ~$100 compared to the $5 is cost me to do this and it would still be just as hard to install and still require programming to get it work with the computer.
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01-18-2005, 11:33 AM
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01-20-2005, 03:06 AM
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01-21-2005, 03:20 AM
