derf/fnordlicht-smd
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***************************** USBNotify ******************************* Fnordlicht-SMD is a free software/hardware project to power and control some high-power LEDs via USB. It is a SMD version of the Fnordlicht http://www.lochraster.org/fnordlicht by FD0. It is intended to: (a) provide controllable ligthing (b) provide software control notification about certain events to the user (c) as an experimental/educational environment to learn working with microcontrollers and usb ============================== License ================================ GPL v2, see LICENSE-file =============================== Author ================================ Timo Boettcher <fnordlicht@spida.net> Please send comments, bugreports and pizza to sbnotify@spida.net ============================== Homepage =============================== http://www.spida.net/projects/hardware/fnordlicht-smd/ ============================== Hardware =============================== The Fnordlicht-SMD hardware is a double sided PCB. Except the 5mm high-power LEDs, all parts are SMD (surface mounted devices). The schematic and some rendered images are in the hardware-directory. ============================== Firmware =============================== The firmware for the device is in the /firmware directory. There are two versions of the firmware: (a) blinktest--do-not-use-with-usb This firmware is intended to test the microcontroller and all connections. NEVER use it with USB connected, as it will test the USB-Connection with signals that are NOT USB-COMPLIANT. Always use an external powersupply when using this software. (b) fnordlicht This firmware is the primary firmware for the device, and enables a software on the USB-host to control the 4 LED-channels. It uses obdevs free software-usb-stack, see http://www.obdev.at/products/vusb for details. Compile it with make USBSERIALNUMBER=xx HW_VERSION=2 where xx is your serialnumber (integer). Additionally there is the usbload bootloader, which emulates a usbasp programmer and can be used to install/update the firmware on the microcontroller. It is preinstalled on the microcontrollers delivered in the kits sold from lochraster.org. There are two ways to activate it: - There is no further software installed - A reset is triggered via the reset-pin (the pins on the ISP header next to the USB-connector have to be shorted) When the bootloader is activated, the blue LEDs will ligth and the white LEDs will blink with approximately 2 Hz. The firmware can now be installed with avrdude: avrdude -p m88 -c usbasp -P usb -U flash:w:usbnotify.hex It shouldn't be possible to overwrite or otherwise damage the bootloader using the programming feature of the bootloader To install the firmware on a factory-fresh microcontroller, an isp-programmer, like the AVRISPmkII, is necessary. The bootloader can be installed using the following commands: avrdude -p m88 -c avrispmkII -P usb -U flash:w:usbload.hex avrdude -p m88 -c avrispmkII -P usb -U lfuse:w:0xE7:m -U hfuse:w:0xDF:m -U lock:w:0x2f:m ========================== Control-Software =========================== The Control-Software for the device is in the /host directory. There are currently six versions of the Control-Software: (a) python The python version of the Control-Software is written in python and uses the pyusb library. This is the reference implementation. (b) c The c version of the Control-Software is written in c and uses the libusb library. (c) perl (c) ruby (d) java (e) lua ============================= Disclaimer ============================== As this is software controlled hardware, it may break all kinds of things when done wrong. This includes the USB-Port and its controller that is driving the USB-Port. The LEDs are really bright, so do not look into them with unprotected eyes, you might suffer permanent eye-damage. The LEDs are driven with currents (27-39mA) higher than specified for these LEDs. This means the LEDs may not be powered permanently, so that they have time to cool down between uses. It is possible to simulate permanent lighting with fast pulsing, though. Don't use it to get notified about real important things, notification may fail.
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hacking around in the fnordlicht-20101008 release
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