User:ThomasT
From Openmoko
m (→GPS) |
(→alternative window managers) |
||
(77 intermediate revisions by one user not shown) | |||
Line 1: | Line 1: | ||
− | + | = My System = | |
− | + | * [[Debian]] without frameworkd | |
+ | * window manager: ratpoison | ||
+ | * GUI: ratmen4wp | ||
− | + | = Hardware Issues = | |
+ | |||
+ | * [[Neo_FreeRunner_Hardware_Issues]] | ||
+ | * [[Disassembling Neo 1973]] | ||
+ | |||
+ | == Poor Audio Frequency Response via Headphones == | ||
+ | |||
+ | The amplifier output coupling capacitors C4111 and C4110 are much too small (1uF). It should be approx. 100uF according to the datasheet of [[LM4853]]. | ||
+ | |||
+ | I just tried to modify my FreeRunner (inserting 100uF capacitors). But I got a power failure after switching on the audio amplifier. After removing my modifications the system works again, but I couldn't read SD cards any more, because I accidentially removed one of the resistors in the data line to the SD slot. After reinserting the resistor the FreeRunner works again. The sound is much better now, but not really HIFI (maybe this is caused by the cheap HAMA headset I am using). | ||
+ | BTW: I will replace these series resistors with ferrite beads in the hope to decrease the GPS interferences. | ||
+ | |||
+ | == GSM Modem not working == | ||
+ | |||
+ | I could not communicate with the modem not even with u-boot and after removing battery over night. | ||
+ | In this case with FSO frameworkd slowed down the system very much, OM2008.9 was almost not usable. (This happend before I made the above HW modifications!) | ||
+ | |||
+ | I removed frameword (fso-gpsd does not work without frameworkd and therefore needed to be replaced by gpsd. | ||
+ | |||
+ | Using GPRS is possible, but a bit tricky. I am currently swichting GSM off and on waiting for the modem startup message. But sometimes I get a strange "alarm". | ||
+ | |||
+ | Maybe [[GSM/Flashing|reflashing the modem]] would help. | ||
+ | |||
+ | == Real Time Clock unreliable== | ||
+ | |||
+ | The RTC is approx. 12 min off per day. I wonder whether the 10pF capacitors at the oscillator crystal are really needed. Maybe I can tune the RTC by lowering the values of those capacitors. There is no tuning register in the RTC unit. | ||
+ | |||
+ | I read a voltage of 475 mV at the terminals of the backup battery BAT1701. | ||
+ | This voltage increases to 2-3 Volts, when FR is connected to a power supply. | ||
+ | |||
+ | == GPS: Very long TTFF == | ||
+ | |||
+ | My FreeRunner has this capacitor at the SD card connector. It anyway takes a long time to get the first fix. The antenna connector was slightly deformed. Could not yet test, whether this is the reason for the bad TTFF as SD cards currently do not work any more (due to a hardware bug I introduced while modifing the audio amplifier). | ||
= Bicycle Computer = | = Bicycle Computer = | ||
+ | |||
+ | [[Biking]] | ||
+ | |||
+ | == Existing Projects and Experiences == | ||
+ | |||
+ | * http://blogs.thehumanjourney.net/finds/entry/20080306 Joseph Reeves uses its NEO1973 on a bicycle | ||
+ | * http://projects.openmoko.org/search/?type_of_search=soft&words=gps&Search=Search | ||
+ | |||
+ | == Mounting == | ||
+ | * http://www.pearl.de/a-PX2065-4044.shtml | ||
+ | |||
+ | |||
+ | == Water Protection == | ||
== Power Supply == | == Power Supply == | ||
Line 11: | Line 58: | ||
Due to the relatively high current consumption of the Freerunner a power supply from a hub dynamo seems to be unavoidable. | Due to the relatively high current consumption of the Freerunner a power supply from a hub dynamo seems to be unavoidable. | ||
− | I | + | I skip the switch mode regulator and will use simple Z-Diode parallel to the Freerunner. Later I want to add an LED light parallel to both. |
== GPS == | == GPS == | ||
− | * | + | === Existing Software === |
− | * | + | |
+ | * [[Navit]] | ||
+ | * [[TangoGPS]] | ||
* [[GPS_Sight]]? | * [[GPS_Sight]]? | ||
* [[GPS_Data_Logger]] | * [[GPS_Data_Logger]] | ||
+ | |||
+ | === Getting GPS Data === | ||
+ | |||
+ | On Freerunner there is no need to read from gpsd or similar. | ||
+ | I just can get the data from /dev/ttySAC1 | ||
== Additional GPS Functions == | == Additional GPS Functions == | ||
Line 30: | Line 84: | ||
Garmin Etrex Legends trip information display is to stupid. I want infos for the current day and for the time since last break. | Garmin Etrex Legends trip information display is to stupid. I want infos for the current day and for the time since last break. | ||
+ | === Location Reporting === | ||
− | + | If I have internet access via the phone during my trip I can regularily update my on webpage with location markers as shown here: http://wiki.openstreetmap.org/index.php/Openlayers_POI_layer_example | |
+ | |||
+ | == Slope, Vertical Speed == | ||
The GPS does not give sufficiently accurate vertical speed. | The GPS does not give sufficiently accurate vertical speed. | ||
Line 38: | Line 95: | ||
How to calibrate it? Is it possible to automatically calibrate it from GSP reading? | How to calibrate it? Is it possible to automatically calibrate it from GSP reading? | ||
− | + | == Sideward Inclination of the Bicycle == | |
By measuring the increase of the total acceleration not by change of the acceleration angle. | By measuring the increase of the total acceleration not by change of the acceleration angle. | ||
− | + | == Road Quality == | |
Can the road (e.i. surface) quality be recorded by measuring the vibrations with the accelerometers? | Can the road (e.i. surface) quality be recorded by measuring the vibrations with the accelerometers? | ||
− | + | == Car Counter == | |
... using the builtin microphone. Or would it be possible with the accelerometers using high sampling rate? | ... using the builtin microphone. Or would it be possible with the accelerometers using high sampling rate? | ||
+ | |||
+ | |||
+ | == Heart Rate Monitor == | ||
+ | |||
+ | Are there Bluetooth Heart Rate Transmitters available? | ||
+ | |||
+ | === Heart Rate Monitor via Touchscreen? === | ||
+ | |||
+ | The touchscreen also delivers pressure information. Can this be used to measure the heart beat by pressing the thumb onto the touchscreen? | ||
+ | |||
+ | [[Touchscreen_Filters]] | ||
+ | |||
+ | == Pedalling Frequency == | ||
+ | |||
+ | Pedal sensors with Bluetooth and power supply by magnetic induction would be nice. | ||
+ | |||
+ | Otherwise USB with an FTDI chip. | ||
+ | |||
+ | |||
+ | == Panorama Viewer == | ||
+ | |||
+ | Online panorama viewer similar to [http://www.ecademix.com/JohannesHofmann/gipfel.html gipfel]. | ||
+ | Instead of the photo image we show the mountain panorama calculated from SRTM data. Online calculation with the SRTM data is much to slow, we use only the precalculated water divide lines. | ||
+ | |||
+ | == Programming == | ||
+ | |||
+ | === Language === | ||
+ | Python | ||
+ | |||
+ | === UI === | ||
+ | |||
+ | ==== python-etk ==== | ||
+ | I could not find any documentation yet. Seems to be the same as python-gtk. | ||
+ | |||
+ | I don't want to have ''eye-candies''. Maybe ''eye-candies'' are neccessary for selling phones. ''Eye-candies'' cause ''eye-caries'' or even ''brain-caries''. ;-) They are for gamers. | ||
+ | |||
+ | Colors are o.k. if they carry information. Color gradients of menu bars are useless and annoying. | ||
+ | |||
+ | Maybe I should directly call xlib instead of using some *tk. From python I could try http://python-xlib.sourceforge.net/ . | ||
+ | |||
+ | ==== Tichy ==== | ||
+ | |||
+ | [[Tichy]] | ||
+ | |||
+ | ==== alternative window managers ==== | ||
+ | The bicycle computer should show different values at the same time. This should be user configurable at runtime. What about having little python scripts just showing a window with one value and let the window mananger do the rest? | ||
+ | |||
+ | It seems ratpoison is the best window manager for openmoko. I am currently using it with the scripts from | ||
+ | [http://ratpoison4wp.projects.openmoko.org/ Ratpoison for Woodpeckers] which is based on [http://ratmen4wp.projects.openmoko.org/ Ratmen for Woodpeckers]. | ||
+ | |||
+ | A new candidate for OpenMoko window managment is [http://www.peereboom.us/scrotwm/html/scrotwm.html scrotwm]. I need to evaluate this one. | ||
+ | |||
+ | |||
+ | Other possible WMs: | ||
+ | |||
+ | * http://incise.org/whimsy.html | ||
+ | * http://pycawm.last-exile.org/ | ||
+ | * http://pywm.sourceforge.net/#status | ||
+ | * http://partiwm.org/ | ||
+ | * http://plwm.sourceforge.net/ | ||
+ | * http://www.freenet.org.nz/python/pywm/ needs fltk | ||
+ | |||
+ | === Plotting === | ||
+ | matplotlib? might be an overkill. Anything usable lightweight available? | ||
+ | |||
+ | = Jogging = | ||
+ | |||
+ | == Accelerometer == | ||
+ | |||
+ | Mount the Freerunner to the shin and measure the damping and motion style with different shoes at various speeds. | ||
+ | Especially interesting to watch the aging of the shoes (different damping). | ||
= Openstreetmap = | = Openstreetmap = | ||
− | |||
I would like to have a simple application to add map information at my current location. | I would like to have a simple application to add map information at my current location. | ||
− | Say, I am standing beneath an ATM, just use a menu item "Add ATM" and typing in its name - | + | Say, I am standing beneath an ATM, just use a menu item "Add ATM" and typing in its name - finished. There is no need for a map display. The program just displays the OSM nodes near the current location. And you can add a new node or modify an existing node. |
+ | = Accelerometer = | ||
− | = | + | == Ideas == |
* Indoor use of those GPS games | * Indoor use of those GPS games | ||
+ | * Programming a Marble game would be more fun than playing it (Martin Senkerik is now having that fun http://projects.openmoko.org/projects/accelgame/) | ||
+ | * Moving within a larger virtual screen by tilting the display. | ||
+ | |||
+ | == Hardware == | ||
+ | |||
+ | * http://wiki.openmoko.org/wiki/ST_LIS302DL | ||
+ | * [http://www.st.com/stonline/products/literature/ds/12726.pdf Datasheet] | ||
+ | |||
+ | I was wondering about the steps of 18 units in the histogram of the accelerometer data. Now I know: the kernel driver already scales the raw data from the chip to mg units. | ||
+ | The data from the chip come as 8 bit data. In +-2.3G mode we get a resolution step size of 18 mg. | ||
+ | |||
+ | [[/Measurements/Accelerometer]] | ||
+ | |||
+ | = Games = | ||
+ | |||
+ | Finger-usable application to play the game of Go: | ||
+ | Somebody somewhere suggested a double click methode for keyboard input. The first click zooms the area of the keyboard the second click activates the key. I don't want this for keyboards but for Go and similar games this could be quite interesting. | ||
+ | |||
+ | Maybe a guesture interface is better. Circle right meens zoom in. Circle left means zoom out. | ||
+ | |||
+ | |||
+ | I thought I am no gamer, but just discovered [[Games#Numptyphysics|Numptyphysics]]. | ||
+ | |||
+ | = HAM Radio = | ||
+ | |||
+ | As we can't use the WIFI or the GSM modem or the GPS receiver for HAM purposes there is not much difference to HAM applications on other PDAs. | ||
+ | |||
+ | == CW Trainer == | ||
+ | |||
+ | == Audio Modems == | ||
+ | |||
+ | Input and Output via audio interface (what is the maximum sampling rate?). | ||
+ | |||
+ | * http://www.w1hkj.com/Fldigi.html | ||
+ | |||
+ | == Spectrum Analyzer == | ||
+ | |||
+ | Spectrum auf audio input signal | ||
+ | |||
+ | * http://www.qsl.net/in3otd/glfer.html Maybe the GUI is to complicated for Freerunner. | ||
+ | |||
+ | == Line of Sight Calculation == | ||
+ | |||
+ | == Smith Chart == | ||
+ | |||
+ | linsmith | ||
+ | |||
+ | == Circuit Entry and Simulation == | ||
+ | |||
+ | * Qucs | ||
+ | |||
+ | == Radio Control == | ||
+ | |||
+ | === Control for Commercial TRXs === | ||
+ | |||
+ | === Homemade TRXs === | ||
+ | |||
+ | * I2C interface on test points | ||
+ | * SPI interface on debug connector | ||
+ | |||
+ | = Music = | ||
+ | |||
+ | == Midi Input via Touchscreen == | ||
+ | |||
+ | There is not much space to use the touchscreen as an ordinary piano keyboard. | ||
+ | |||
+ | What about using the touchscreen like the left hand fingering on a guitar, mandolin, banjo ore similar? The touchscreen lays in front of you in landscape mode. There are four rows, one for each finger. | ||
+ | |||
+ | | D# | G | B | d# | | ||
+ | | D | F# | A# | d | | ||
+ | | C# | F | A | c# | | ||
+ | | C | E | G# | c | | ||
+ | This layout might be to simple. Should it be optimized for easy chord playing? | ||
+ | To come more close to a piano and common string instruments it might be better | ||
+ | to flip the arrangment of the notes. | ||
+ | | c | c# | d | d# | | ||
+ | | G# | A | A# | B | | ||
+ | | E | F | F# | G | | ||
+ | | C | C# | D | D# | | ||
+ | |||
+ | Unfortunately the touchscreen handles only single touches ([[UI_Improvements#The_touchscreen]]). Therefore a polyphonic input is not possible. | ||
+ | |||
+ | Octave shifting via accelerometer reading? | ||
+ | |||
+ | Similiar project: http://www.neo1973-germany.de/wiki/epiano Obviously not what I am having in mind. | ||
+ | |||
+ | == Other interesting Music Software == | ||
+ | |||
+ | * http://performous.org | ||
+ | |||
+ | = Keyboard = | ||
+ | |||
+ | Why not using the above Midi Keyboard for character input? | ||
+ | |||
+ | | S | U | R | T | | ||
+ | | A | E | I | O | | ||
+ | | D | H | N | M | | ||
+ | | F | P | G | J | | ||
+ | | M1| M2|SPC| BS| | ||
+ | |||
+ | Letter order is random here. Need to be optimized for minimum mode switching. | ||
+ | Space, Backspace,... can be done by guestures. | ||
+ | |||
+ | == Morse Code Input == | ||
+ | |||
+ | Will I be faster? Is there usable code available? | ||
+ | |||
+ | Decode would be easier if I'd use an "electronic keyer" e.g. which sends dots and dashes in a predefined length and predefined spaces. | ||
+ | |||
+ | * http://morseall.org/ | ||
+ | |||
+ | = Unsorted = | ||
+ | |||
+ | * I wonder what [http://www.igelle.org igelle] is and whether it is worth trying that for FreeRunner. The website isn't very informative. | ||
+ | * External Keyboard: The FreeRunner can supply 5V to an external USB device [[USB_host#Selecting_USB_host_mode]]. So I also can connect my MIDI keyboard? | ||
+ | |||
+ | = OS Details = | ||
+ | |||
+ | == Mounting internal Flash when booting from SD == | ||
+ | |||
+ | Mount the internal root file system | ||
+ | |||
+ | mount -t jffs2 /dev/mtdblock6 /mnt | ||
+ | |||
+ | On Debian this is already mounted at /mnt/flash | ||
+ | |||
+ | |||
+ | == Links == | ||
+ | |||
+ | * [http://svnweb.openmoko.org/trunk/src/target/OM-2007.2/daemons/neod/src/buttonactions.c?rev=4617&view=markup Noed Source] | ||
+ | |||
+ | * [http://svnweb.openmoko.org/trunk/src/target/OM-2007.2/daemons/neod/src/buttonactions.c?rev=4617&view=markup Mickey Term] talk to the GSM Modem | ||
+ | |||
+ | * [[OpenmokoFramework/mdbus]] | ||
+ | |||
+ | * http://projects.openmoko.org/projects/python-openmoko/ | ||
+ | |||
+ | * [[Gsmd/document]] This does not work with FSO. Go to the [http://git.freesmartphone.org/?p=specs.git;a=blob_plain;f=html/index.html;hb=HEAD interface spec of FSO] | ||
+ | |||
+ | * [[GTA02_sysfs]] | ||
+ | * [[Kernel]] | ||
+ | * [[User:CesarB/cpufreq]] | ||
+ | * [[Talk:Alarm daemon]] | ||
+ | * [[NXP_PCF50633]] Power Managment and RTC | ||
+ | * [[FAQ]] | ||
+ | * [http://people.openmoko.org/joerg/calypso_moko_FW/] | ||
+ | ---- |
Latest revision as of 11:01, 29 January 2009
[edit] My System
- Debian without frameworkd
- window manager: ratpoison
- GUI: ratmen4wp
[edit] Hardware Issues
[edit] Poor Audio Frequency Response via Headphones
The amplifier output coupling capacitors C4111 and C4110 are much too small (1uF). It should be approx. 100uF according to the datasheet of LM4853.
I just tried to modify my FreeRunner (inserting 100uF capacitors). But I got a power failure after switching on the audio amplifier. After removing my modifications the system works again, but I couldn't read SD cards any more, because I accidentially removed one of the resistors in the data line to the SD slot. After reinserting the resistor the FreeRunner works again. The sound is much better now, but not really HIFI (maybe this is caused by the cheap HAMA headset I am using). BTW: I will replace these series resistors with ferrite beads in the hope to decrease the GPS interferences.
[edit] GSM Modem not working
I could not communicate with the modem not even with u-boot and after removing battery over night. In this case with FSO frameworkd slowed down the system very much, OM2008.9 was almost not usable. (This happend before I made the above HW modifications!)
I removed frameword (fso-gpsd does not work without frameworkd and therefore needed to be replaced by gpsd.
Using GPRS is possible, but a bit tricky. I am currently swichting GSM off and on waiting for the modem startup message. But sometimes I get a strange "alarm".
Maybe reflashing the modem would help.
[edit] Real Time Clock unreliable
The RTC is approx. 12 min off per day. I wonder whether the 10pF capacitors at the oscillator crystal are really needed. Maybe I can tune the RTC by lowering the values of those capacitors. There is no tuning register in the RTC unit.
I read a voltage of 475 mV at the terminals of the backup battery BAT1701. This voltage increases to 2-3 Volts, when FR is connected to a power supply.
[edit] GPS: Very long TTFF
My FreeRunner has this capacitor at the SD card connector. It anyway takes a long time to get the first fix. The antenna connector was slightly deformed. Could not yet test, whether this is the reason for the bad TTFF as SD cards currently do not work any more (due to a hardware bug I introduced while modifing the audio amplifier).
[edit] Bicycle Computer
[edit] Existing Projects and Experiences
- http://blogs.thehumanjourney.net/finds/entry/20080306 Joseph Reeves uses its NEO1973 on a bicycle
- http://projects.openmoko.org/search/?type_of_search=soft&words=gps&Search=Search
[edit] Mounting
[edit] Water Protection
[edit] Power Supply
Due to the relatively high current consumption of the Freerunner a power supply from a hub dynamo seems to be unavoidable.
I skip the switch mode regulator and will use simple Z-Diode parallel to the Freerunner. Later I want to add an LED light parallel to both.
[edit] GPS
[edit] Existing Software
[edit] Getting GPS Data
On Freerunner there is no need to read from gpsd or similar. I just can get the data from /dev/ttySAC1
[edit] Additional GPS Functions
[edit] Altitude Plots
Of the travelled track and also of the upcoming (hopefully OSM will soon provide elevation information of the roads)
[edit] Trip Information
Garmin Etrex Legends trip information display is to stupid. I want infos for the current day and for the time since last break.
[edit] Location Reporting
If I have internet access via the phone during my trip I can regularily update my on webpage with location markers as shown here: http://wiki.openstreetmap.org/index.php/Openlayers_POI_layer_example
[edit] Slope, Vertical Speed
The GPS does not give sufficiently accurate vertical speed. A barometric sensor (see Variometer) would be nice. Calculation of the vertical speed by integrating the accelerometer readings also not accurate. But maybe it is possible to use the accelerometers to measure the slope of the road. How to calibrate it? Is it possible to automatically calibrate it from GSP reading?
[edit] Sideward Inclination of the Bicycle
By measuring the increase of the total acceleration not by change of the acceleration angle.
[edit] Road Quality
Can the road (e.i. surface) quality be recorded by measuring the vibrations with the accelerometers?
[edit] Car Counter
... using the builtin microphone. Or would it be possible with the accelerometers using high sampling rate?
[edit] Heart Rate Monitor
Are there Bluetooth Heart Rate Transmitters available?
[edit] Heart Rate Monitor via Touchscreen?
The touchscreen also delivers pressure information. Can this be used to measure the heart beat by pressing the thumb onto the touchscreen?
[edit] Pedalling Frequency
Pedal sensors with Bluetooth and power supply by magnetic induction would be nice.
Otherwise USB with an FTDI chip.
[edit] Panorama Viewer
Online panorama viewer similar to gipfel. Instead of the photo image we show the mountain panorama calculated from SRTM data. Online calculation with the SRTM data is much to slow, we use only the precalculated water divide lines.
[edit] Programming
[edit] Language
Python
[edit] UI
[edit] python-etk
I could not find any documentation yet. Seems to be the same as python-gtk.
I don't want to have eye-candies. Maybe eye-candies are neccessary for selling phones. Eye-candies cause eye-caries or even brain-caries. ;-) They are for gamers.
Colors are o.k. if they carry information. Color gradients of menu bars are useless and annoying.
Maybe I should directly call xlib instead of using some *tk. From python I could try http://python-xlib.sourceforge.net/ .
[edit] Tichy
[edit] alternative window managers
The bicycle computer should show different values at the same time. This should be user configurable at runtime. What about having little python scripts just showing a window with one value and let the window mananger do the rest?
It seems ratpoison is the best window manager for openmoko. I am currently using it with the scripts from Ratpoison for Woodpeckers which is based on Ratmen for Woodpeckers.
A new candidate for OpenMoko window managment is scrotwm. I need to evaluate this one.
Other possible WMs:
- http://incise.org/whimsy.html
- http://pycawm.last-exile.org/
- http://pywm.sourceforge.net/#status
- http://partiwm.org/
- http://plwm.sourceforge.net/
- http://www.freenet.org.nz/python/pywm/ needs fltk
[edit] Plotting
matplotlib? might be an overkill. Anything usable lightweight available?
[edit] Jogging
[edit] Accelerometer
Mount the Freerunner to the shin and measure the damping and motion style with different shoes at various speeds. Especially interesting to watch the aging of the shoes (different damping).
[edit] Openstreetmap
I would like to have a simple application to add map information at my current location. Say, I am standing beneath an ATM, just use a menu item "Add ATM" and typing in its name - finished. There is no need for a map display. The program just displays the OSM nodes near the current location. And you can add a new node or modify an existing node.
[edit] Accelerometer
[edit] Ideas
- Indoor use of those GPS games
- Programming a Marble game would be more fun than playing it (Martin Senkerik is now having that fun http://projects.openmoko.org/projects/accelgame/)
- Moving within a larger virtual screen by tilting the display.
[edit] Hardware
I was wondering about the steps of 18 units in the histogram of the accelerometer data. Now I know: the kernel driver already scales the raw data from the chip to mg units. The data from the chip come as 8 bit data. In +-2.3G mode we get a resolution step size of 18 mg.
[edit] Games
Finger-usable application to play the game of Go: Somebody somewhere suggested a double click methode for keyboard input. The first click zooms the area of the keyboard the second click activates the key. I don't want this for keyboards but for Go and similar games this could be quite interesting.
Maybe a guesture interface is better. Circle right meens zoom in. Circle left means zoom out.
I thought I am no gamer, but just discovered Numptyphysics.
[edit] HAM Radio
As we can't use the WIFI or the GSM modem or the GPS receiver for HAM purposes there is not much difference to HAM applications on other PDAs.
[edit] CW Trainer
[edit] Audio Modems
Input and Output via audio interface (what is the maximum sampling rate?).
[edit] Spectrum Analyzer
Spectrum auf audio input signal
- http://www.qsl.net/in3otd/glfer.html Maybe the GUI is to complicated for Freerunner.
[edit] Line of Sight Calculation
[edit] Smith Chart
linsmith
[edit] Circuit Entry and Simulation
* Qucs
[edit] Radio Control
[edit] Control for Commercial TRXs
[edit] Homemade TRXs
* I2C interface on test points * SPI interface on debug connector
[edit] Music
[edit] Midi Input via Touchscreen
There is not much space to use the touchscreen as an ordinary piano keyboard.
What about using the touchscreen like the left hand fingering on a guitar, mandolin, banjo ore similar? The touchscreen lays in front of you in landscape mode. There are four rows, one for each finger.
| D# | G | B | d# | | D | F# | A# | d | | C# | F | A | c# | | C | E | G# | c | This layout might be to simple. Should it be optimized for easy chord playing? To come more close to a piano and common string instruments it might be better to flip the arrangment of the notes. | c | c# | d | d# | | G# | A | A# | B | | E | F | F# | G | | C | C# | D | D# |
Unfortunately the touchscreen handles only single touches (UI_Improvements#The_touchscreen). Therefore a polyphonic input is not possible.
Octave shifting via accelerometer reading?
Similiar project: http://www.neo1973-germany.de/wiki/epiano Obviously not what I am having in mind.
[edit] Other interesting Music Software
[edit] Keyboard
Why not using the above Midi Keyboard for character input?
| S | U | R | T | | A | E | I | O | | D | H | N | M | | F | P | G | J | | M1| M2|SPC| BS|
Letter order is random here. Need to be optimized for minimum mode switching. Space, Backspace,... can be done by guestures.
[edit] Morse Code Input
Will I be faster? Is there usable code available?
Decode would be easier if I'd use an "electronic keyer" e.g. which sends dots and dashes in a predefined length and predefined spaces.
[edit] Unsorted
- I wonder what igelle is and whether it is worth trying that for FreeRunner. The website isn't very informative.
- External Keyboard: The FreeRunner can supply 5V to an external USB device USB_host#Selecting_USB_host_mode. So I also can connect my MIDI keyboard?
[edit] OS Details
[edit] Mounting internal Flash when booting from SD
Mount the internal root file system
mount -t jffs2 /dev/mtdblock6 /mnt
On Debian this is already mounted at /mnt/flash
[edit] Links
- Mickey Term talk to the GSM Modem
- Gsmd/document This does not work with FSO. Go to the interface spec of FSO
- GTA02_sysfs
- Kernel
- User:CesarB/cpufreq
- Talk:Alarm daemon
- NXP_PCF50633 Power Managment and RTC
- FAQ
- [1]