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

Originally Posted by no2chem

yeah, it is, only problem is sourcing it... the hirose connectors GT3 series seem correct, looks like part no. GT3-20DP-2.5DSA, but I can't figure out a place to order them...

Tyco connectors are easier to get hold of than Hirose, because there's a lot more Tyco dealers than Hirose dealers.
So can you check the dimensions of this Tyco (AMP) 174055-2 .040 Series Multi-Lock 20 way cap housing to see if it will fit:

174055-2 Product Details: http://catalog.tycoelectronics.com/c...9121,19217&N=4
Product Drawings: http://ecommas.tycoelectronics.com/c..._174055_G2.pdf
3D PDF-drawing: http://ecommas.tycoelectronics.com/c...74055-2_G2.pdf

American dealer: http://www.alliedelec.com/Search/Pro...&DESC=174055-2
UK dealer: http://uk.rs-online.com/web/search/s...hTerm=174055-2



Pics of the car connector it should mate with:

It doesn't look like this female connector has a groove in each side like the Tyco and Hirose cap housing does, so not sure if it will fit. You will have to measure the connector and compare it to the dimensions in the Tyco drawing.


Or alternatively try to ask for a Hirose qutation from http://www.mio-corp.co.jp/index_e.htm

Originally Posted by Blues

Tyco connectors are easier to get hold of than Hirose, because there's a lot more Tyco dealers than Hirose dealers.
So can you check the dimensions of this Tyco (AMP) 174055-2 .040 Series Multi-Lock 20 way cap housing to see if it will fit:
...

Or alternatively try to ask for a Hirose qutation from http://www.mio-corp.co.jp/index_e.htm

Blues, thanks for the information.... I've decided to take the easy route and just order a sample to test. I've also ordered a sample of http://catalog.tycoelectronics.com/c...RQPN=1123357-1

and the related contacts because this may allow for it to be more universal. I'll let you know how it fits when I get them...

Still having to take a knife and cutting a grove into your connector is much easier than having to depin/cut wires like you would probally have to do without one.

Originally Posted by no2chem

Blues, thanks for the information....

No problem, I used to work for an electronics distributor who was specializing in connectors and wiring harnesses, so I know a lot of different connector and wiring harnesses manufactures in both Asia, Europe and America and have been doing business with many of them.

Originally Posted by no2chem

I've decided to take the easy route and just order a sample to test. I've also ordered a sample of http://catalog.tycoelectronics.com/c...RQPN=1123357-1

and the related contacts because this may allow for it to be more universal. I'll let you know how it fits when I get them...

Ok, what are you going to use 1123357-1 for? You are aware that this is from a different series of connectors than the one I linked to and these wont mate with each other?
174055-2 is from the Multilock 040 series
1123357-1 is from the Multilock 040 III series
These two series wont mate with each other.

174055-2 mates with 174047-2 http://catalog.tycoelectronics.com/T...&RQPN=174047-2
174055-2 is a right angle (horizontal) connector, you can also get a staight version (vertical) of the same connectorn which is 174977-2: http://catalog.tycoelectronics.com/T...&RQPN=174977-2

WOW! This looks really good. I would love to get one of these whenever it is available.

Keep up the great work!!

Originally Posted by Blues

No problem, I used to work for an electronics distributor who was specializing in connectors and wiring harnesses, so I know a lot of different connector and wiring harnesses manufactures in both Asia, Europe and America and have been doing business with many of them.


Ok, what are you going to use 1123357-1 for? You are aware that this is from a different series of connectors than the one I linked to and these wont mate with each other?
174055-2 is from the Multilock 040 series
1123357-1 is from the Multilock 040 III series
These two series wont mate with each other.

174055-2 mates with 174047-2 http://catalog.tycoelectronics.com/T...&RQPN=174047-2
174055-2 is a right angle (horizontal) connector, you can also get a staight version (vertical) of the same connectorn which is 174977-2: http://catalog.tycoelectronics.com/T...&RQPN=174977-2

oops, thanks for pointing that out. guess I am ordering http://catalog.tycoelectronics.com/c...&RQPN=175652-2 as well.

Originally Posted by no2chem

my proposal is to construct a hardware interface to connect the 20pin connector directly to USB. I've researched the controls, and it seems that the steering wheel controls consist of 3 wires (pins 7,8,9) which use alternating resistance values to indicate which buttons are being pressed.

Isn't it pin 6, 7 & 8 as desribed here? http://www.castulucci.com/projects/c...ors/index.html

# Pin 6: GND (Ground from Steering wheel audio controls) - Neither Input nor Output - Connected
# Pin 7: SW1 (Seek+/-, Vol+/- Inputs from Steering wheel audio controls) - Input - Connected
# Pin 8: SW2 (Mode input from Steering wheel audio controls) - Input - Connected

I found this Toyota steering wheel control schematic via another topic: Toyota Steering Wheel Control Question

Is this schematic correct?
And are the resistor values also correct?

Originally Posted by no2chem

I've done a quick design of the schematic, i will get it posted up shortly.

Any schematic yet?

Will the AVR source code get published too?
Did you use AVR-USB? http://www.obdev.at/products/avrusb/index.html
(AVR-USB is a software-only implementation of a low-speed USB)

AVR-USB
Advantages over other Firmware-Only Implementations

A similar driver for the AVR series of microcontrollers is available from Igor Češko. Our USB driver has the following advantages over Igor's driver:

* All customizable code written in ANSI-C and thus easier to maintain.
* Modular concept: easier to integrate into existing designs.
* Slightly smaller code size in spite of high level language modules.
* Faster: All encoding/decoding (USB requires NRZI coding and bit stuffing) is done in real-time, not in the main loop after storing away the raw data stream.
* More endpoints, USB descriptors can be better customized.
* AVR-USB comes with a free shared Vendor- / Product-ID pair.
* The level of standards conformance is documented (description of limitations and potential problems).
* Licensed under the terms of the GNU General Public License or alternatively under a commercial license.

Dick Streefland has stripped down an older version of AVR-USB to the basics. His code is easier to read and understand, but lacks some of the features found in AVR-USB:

* AVR-USB supports up to 4 endpoints. This allows implementing devices conforming to the HID or CDC device class.
* AVR-USB passes the tests in usb.org's test utility.
* AVR-USB supports 12 MHz and 16 MHz crystal clocks as well as 16.5 MHz internal RC oscillator clock.

Or maybe you used Igor Češko's IgorPlug-USB or Dick Streefland's USBtiny instead?

Originally Posted by Blues

Isn't it pin 6, 7 & 8 as desribed here? http://www.castulucci.com/projects/c...ors/index.html

I found this Toyota steering wheel control schematic via another topic: Toyota Steering Wheel Control Question

Is this schematic correct?
And are the resistor values also correct?


Any schematic yet?

I don't think those values are correct. These are the values I came up with...

perhaps the pin numbers I had listed were wrong, I shall double check... and yes, I used AVRUSB, so the code is licensed under GPL.

I will post the schematic and code when I get back today, I just need to look it over again before I send the board for production .. there has been a minor change to the schematic.