Tchibo Ecobutton
The Tchibo Ecobutton is a small USB-powered device / button which acts as a HID device (and also has three fancy green LEDs). The use-case is that you press the button to suspend your PC in order to save power.
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Photos
Device
Open device
PCB, front
PCB, back
How it works
It's a USB HID device. When you press the button, the HID devices "presses" the Windows+R keys on your (Windows) PC, which openes the standard Windows "Run" dialog, then it presses the keys ecobutton and Enter, i.e. it executes a Windows program called ecobutton, which in turn does the rest of the work.
This device can easily be abused for other tasks, just provide an application named ecobutton which does whatever you want to happen at the button press. It's equally simple to do it on Linux or Mac OS X, of course. Just go into a console (or position the cursor in an xterm) and press the button. It'll invoke a program named recobutton (sic!) which must be in your path, as the Windows key is usually ignored on Linux.
Info
$ lsusb -vvv
Bus 003 Device 005: ID 3412:7856
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x3412
idProduct 0x7856
bcdDevice 0.01
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 34
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 1 Keyboard
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 63
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Device Status: 0x0000
(Bus Powered)
