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Thread: Interest check: Camry/Scion Steering Wheel Control -> USB

  1. #101
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    good news, I've figured out how to get AVRUSB to show up as a composite device (apparently no one has done this before? or it isn't documented anyway), which means we probably should actually consider adding the other adc inputs, as well as maybe some digital 12v on/off inputs...

    currently I have the input report displaying adc voltage levels, (scale 5V = 255)... while of course, acting as a keyboard at the same time...

    this also means we can program keypresses without programming firmware, which is a big plus for people who dont want to hassle w/ firmware.


  2. #102
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    Wow this is awsome. I can't wait for this to come out it looks amazing. Im so glad you stuck with this.

  3. #103
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    okay, so we actually have some options...

    1) we can design the board as is. the problem of course is the cost, since i'll have to order about 100 units of pcbs, parts and assembly.. but if we can get about 50 people willing to commit on a purchase at $20-25 it won't be a problem.

    2) we can expand the board so it supports more vehicles. so the plus side is that more people will be interested, and the minimum number can be more easily met, and the board will work for other vehicles in case you decide to change makes. I do warn that this might add a little to the cost, we'd probably be looking at a $3 digital potentiometer, at minimum.


    i'll be posting a new thread to check how interest is, with a poll.

  4. #104
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    Quote Originally Posted by no2chem View Post
    2) we can expand the board so it supports more vehicles. so the plus side is that more people will be interested, and the minimum number can be more easily met, and the board will work for other vehicles in case you decide to change makes. I do warn that this might add a little to the cost, we'd probably be looking at a $3 digital potentiometer, at minimum.
    Instead of a digital potentiometer you could just add different resistor values to a number of port pins. For example add 8 different values to 8 port pins and then pull some of them high depending on the required resistor value and set the port pins as inputs for the resistors values not nedded.
    Similar to this, but without the inverting amplifier part: http://www.allaboutcircuits.com/vol_4/chpt_13/2.html

  5. #105
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    Quote Originally Posted by Blues View Post
    Instead of a digital potentiometer you could just add different resistor values to a number of port pins. For example add 8 different values to 8 port pins and then pull some of them high depending on the required resistor value and set the port pins as inputs for the resistors values not nedded.
    Similar to this, but without the inverting amplifier part: http://www.allaboutcircuits.com/vol_4/chpt_13/2.html
    ah, yes, that would be the other alternative. But I'm not sure how clean the level on the port pins is? or does it really matter? those xmegas are starting to look real nice with their built in DAC =) but if it works it is a good way to actually use a lot of the port pins

  6. #106
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    Quote Originally Posted by no2chem View Post
    ah, yes, that would be the other alternative. But I'm not sure how clean the level on the port pins is? or does it really matter?
    Since you only need to detect about 3-4 different levels (depending on the number of buttons on each induvidual resistor ladder), I don't think noise will be an issue. That's only about a 2-3-bit resolution required of an ADC capable of 10-bit resolution. The required resolution depends on how well the whole range of values is distributed over from GND to Vref (Vcc). With a careful selection of the proper "output" resistor value, the required resolution is will be lower than with a poor selecetion of the "output" resistor value which puts the volatages for all button preeses closer to each other.
    Seperate analog VCC filtering is probably not even nessasary, the port pins wont be powered from analog VCC anyway. If the resitor values are selected so it's possible to make use of most of the GND to VCC range, then resolution wont be very important. During initial setup the firmware could do self calibrating where each button is pressed one at a time and the "output" resitor value is chosen, and proper ADC input thresholds are set for each button voltage.
    And since there's many unsued port pins here's a way to use some.

  7. #107
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    I own a 2003 Ford focus, and am very interested in this design.

    I'm impressed by the knowledge you guys have! Any update on the design etc?

    Cheers

  8. #108
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    Quote Originally Posted by Callum View Post
    I own a 2003 Ford focus, and am very interested in this design.
    Do you have steering wheel buttons for your Focus?

  9. #109
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    I Do indeed, the actual control looks like this:



    I believe there are only 3 wires on the connector itself. I can provide details or pictures etc on the connector itself if you needed.

  10. #110
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    Quote Originally Posted by Callum View Post
    I believe there are only 3 wires on the connector itself. I can provide details or pictures etc on the connector itself if you needed.
    Please do.
    And please measure the resistance between GND and the output pins for each of the different button presses and post the result.
    Similar to this:

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