Post by: Bluebie on January 11, 2013, 07:08:14 am
Hook it up like this:
And upload the sketch.
Originally I connected the push button wire (pins on left side of encoder) to D0 instead of D5, but it wouldn't work for me - seems like the LED on that pin drains so much power it pulls the pin low!!! That's pretty annoying. Hopefully future Digisparks use a blue or white LED there to be more careful not to pull it low. Green is pretty though! ^_^
I tested it on my Mac and it's working great. It should work on any system which supports keyboards with volume buttons on them. <3
Post by: Russtang on January 11, 2013, 11:03:05 am
Post by: Bluebie on January 14, 2013, 04:30:39 pm
Post by: plexer on January 15, 2013, 04:14:01 am
Ben
Post by: Bluebie on January 15, 2013, 05:51:06 am
#define KEY_MUTE 127
#define KEY_VOLUME_UP 128
#define KEY_VOLUME_DOWN 129
Taken from http://www.usb.org/developers/devclass_docs/Hut1_11.pdf page 56
KEY_MUTE is used when the button is pressed in, KEY_VOLUME_UP is sent each time the knob clicks one notch clockwise, KEY_VOLUME_DOWN is sent when turned one notch anticlockwise.
Post by: plexer on January 15, 2013, 07:42:32 am
Ben
Post by: Bluebie on January 15, 2013, 03:33:23 pm
Post by: Bluebie on March 13, 2013, 10:31:29 pm
On the topic of bootloaders, if you made one of these and wired it up like me you can use the micronucleus jumper varient to make it boot instantly instead of waiting five seconds. Just hold down the mute button when you plug it in to enter programming mode then choose upload in the digispark software to upload a new program at your leasure (it doesn't time out after five seconds). Then after uploading it will instantly run in the next version of the digispark software or with my mac beta build. In current versions I think you have to unplug and replug the device once done uploading still. Jumper varient is at http://digistump.com/board/index.php/topic,320.0.html
Post by: Mark on March 13, 2013, 11:29:09 pm
In windows the keys are mapped based on the country and keyboard mapping.
You can try these codes.
http://msdn.microsoft.com/en-nz/library/windows/desktop/dd375731%28v=vs.85%29.aspx
they may match.
Quote
Mark#define KEY_MUTE1270xAD
#define KEY_VOLUME_UP1280xAF
#define KEY_VOLUME_DOWN1290xAE
Post by: koogar on July 26, 2013, 02:08:58 pm
From what i can gather to enable multimedia buttons in windows you need to configure it as a Consumer control device.
In order to control the device as determined by the media control keys was used corresponding USBHidReportDescriptor, taken from the USB descriptor multimedia keyboards, and writing the appropriate handling code.
Example USB descriptor
PROGMEM char usbHidReportDescriptor [25] = {/ * USB report descriptor * /
0x05, 0x0c, / ??/ ??USAGE_PAGE (Consumer Devices)
0x09, 0x01, / / ??USAGE (Consumer Control)
0xa1, 0x01, / / ??COLLECTION (Application)
0x85, 0x01, / / ??REPORT_ID (1)
0x19, 0x00, / / ??USAGE_MINIMUM (Unassigned)
0x2a, 0x3c, 0x02, / / ??USAGE_MAXIMUM (AC Format)
0x15, 0x00, / / ??LOGICAL_MINIMUM (0)
0x26, 0x3c, 0x02, / / ??LOGICAL_MAXIMUM (572)
0x95, 0x01, / / ??REPORT_COUNT (1)
0x75, 0x10, / / ??REPORT_SIZE (16)
0x81, 0x00, / / ??INPUT (Data, Var, Abs)
0xc0 / / END_COLLECTION};
That was taken from http://obruboff.ru/usb-volume-control-ver-2/ which uses V-USB an ATTiny 85
I have build the circuit from the link above and it works great but its nice to have a bootloader as in the digispark.
Consumer Device Codes http://msdn.microsoft.com/en-us/windows/hardware/gg462991.aspx
MUTE 0xe2
VOLUME DOWN 0xea
VOLUME UP 0xe9
The V-USB MAME panel example has joystick,keyboard and consumer device in its USBHidReportDescriptor this also includes volume control http://vusb.wikidot.com/project:mamepanel
Any chance we could have a digispark consumer device library with the volume control as an example, as its pretty useful.
Thanks
Rupert
Post by: Mercules on September 11, 2013, 06:52:56 pm
Thanks for the code Bluebie. I will post if I get the media keys working natively. I will also post pictures when I build it.
EDIT: asked for code but I found it :P
Post by: Bluebie on September 11, 2013, 07:09:29 pm
Or maybe you could use a program like this? http://www.addictivetips.com/windows-tips/control-volume-with-hotkeys-using-volcontrol/ it might give you a better user interface anyway. With that one you can adjust how quickly it changes the volume setting.
Post by: Bluebie on October 12, 2013, 10:25:55 pm
Post by: sys_spud on December 14, 2013, 01:54:31 pm
I tried making this, can only get the mute function to work, volume up/down no response. This is on a Mac Air OS/X 10.7.5. The troubleshooting I've done includes: continuity checks, changing the key codes. swapping out the encoder. I did a blink on the LED when the encoder is turned and that seemed to work. The encoder I'm using is the one adafruit sells.
I'm really surprised that something that worked for you and seems straightforward is giving me so much trouble.
I did have a question on the blue wire in your picture that seems to be connected to 5V pin, then can't tell where it connects up to. Your diagram doesn't show anything using 5V. Are you somehow connecting to GND with this instead, or something?
Any thoughts on troubleshooting this gratefully accepted!
Post by: Bluebie on December 15, 2013, 06:42:08 pm
I'm not sure what could be going on. I'm using mine with a Mac running 10.9. Maybe full USB support was a new addition and it'd be worthwhile to try using adafruit's library instead, which can emulate windows multimedia keyboards.
Post by: mymaestro on December 29, 2013, 01:55:24 am
But Adafruit's version http://learn.adafruit.com/trinket-usb-volume-knob/overview works fine... even uses the LED power draw you mentioned initially as pulldown for the mute button!
Tested on Linux and Windows, and all work well.
Post by: zeubest on January 14, 2017, 06:09:06 pm
https://learn.adafruit.com/trinket-usb-volume-knob/overview (https://learn.adafruit.com/trinket-usb-volume-knob/overview)
Photo of wired with mute version.
(http://zeubest.free.fr/000/usbVolumeKnob.jpg)