Jason Short
95e1f05f82
defines.h
...
removed Approach mode enumeration
2012-07-01 13:40:11 -07:00
Jason Short
3fb268da96
read_control_switch
...
Removed Prev_WP reference. unneeded.
2012-07-01 13:40:11 -07:00
Jason Short
99d6a45948
Config.h
...
Removed Approach delay redundancy - using land timer instead
Removed Retro loiter mode param
2012-07-01 13:40:11 -07:00
Jason Short
059fea36aa
RTL: Commands.pde
...
When we are out of commands we land or Loiter at the RTL_Approach_altitude.
2012-07-01 13:40:11 -07:00
Jason Short
9cd9dd168e
RTL: Commands.pde
...
Removed do_approach function - now redundant
2012-07-01 13:40:11 -07:00
Jason Short
e5fbcb629d
Arducopter.pde_RTL:
...
added a new RTL function that goes into Loiter, first, checks if we have reached RTL_Altitude, then enters WP mode to come home.
Removes Approach mode. Uses Auto_Approach value to decide if we should land or descend to a certain altitude
2012-07-01 13:40:11 -07:00
Jason Short
8c8f44e6f7
Arducopter: enabled RTL_altitude, renamed function to be more accurate
2012-07-01 13:40:11 -07:00
Jason Short
b199fb22a2
Added code for self centering throttle - disabled by default.
2012-07-01 13:40:11 -07:00
Andrew Tridgell
e791cad9ef
AnalogSource: convert analogRead() calls to the new API
...
this should give us much better analog values, plus save a bunch of
CPU time
2012-07-01 15:01:05 +10:00
rmackay9
9624f8c179
ArduCopter: updated STABILIZE_ROLL_I to 0.01 (was 0.1) as instructed by Marco
2012-06-30 19:26:14 +09:00
Jason Short
60cdbe771c
Circle_WP distance check fix
2012-06-29 21:20:28 -07:00
Jason Short
d448ea23e6
Commands.pde: increased bad WP distance check
2012-06-29 21:20:28 -07:00
Jason Short
d893cde785
navigation.pde : Added a drag/velocity prediction filter for improved I term wind correction.
2012-06-29 21:20:28 -07:00
Jason Short
59181eab3d
System.pde: Toy mode details for set_mode()
2012-06-29 21:20:28 -07:00
Jason Short
7178da3538
GCS_Mavlink: added notes to #if malink10
2012-06-29 21:20:28 -07:00
Jason Short
49243bc206
defines.h: Toy Mode defines for flight modes
2012-06-29 21:20:28 -07:00
Jason Short
40e0d88d12
Config.h: Optimizing Nav gains
2012-06-29 21:20:28 -07:00
Jason Short
bcf6c03157
Attitude.pde: Toy mode logic
2012-06-29 21:20:27 -07:00
Jason Short
146a4b021f
Arducopter.pde: Added Toy mode refinements
2012-06-29 21:20:27 -07:00
Jason Short
eb06320559
Params: Added toy_yate_rate
2012-06-29 21:20:27 -07:00
Jason Short
57b75736ce
Added Toy mode to navigation
2012-06-29 21:20:27 -07:00
Jason Short
c830ab6ded
Aeducopter.pde: Toy mode updates
2012-06-29 21:20:27 -07:00
Adam M Rivera
d399143498
commands_process.pde: Bug fix 427. By default, the copter would land after an AUTO mission. Updated to check for valid approach altitude at end of mission.
2012-06-29 21:41:56 -05:00
Andrew Tridgell
1cb96e14a9
SITL: enable the SIM_* parameters in ArduCopter and ArduPlane
2012-06-29 15:10:52 +10:00
Adam M Rivera
44ce8fc4bc
ArduCopter: Loiter Timer should have been set when the approach altitude was set. Previously, land had to be enabled before auto approach would work.
2012-06-28 20:34:53 -05:00
Andrew Tridgell
7883c4a545
ACM: ArduCopter updates for new compass interface
2012-06-27 16:01:50 +10:00
Andrew Tridgell
7eb150a2f0
ACM: adapt the ArduCopter code for new barometer interface
2012-06-27 16:01:50 +10:00
Andrew Tridgell
d71e82191f
ACM: enable GPS in AHRS for ArduCopter
...
this is an experiment in centripetal correction for multicopters
2012-06-27 16:01:49 +10:00
Jason Short
57e4fabb57
Attitude.pde: Turned off boost_p for nav_throttle based on Testing feedback from Marco.
2012-06-26 10:39:42 -07:00
Jason Short
3fcd3100cc
Added user editable define for Super simple radius
2012-06-26 10:38:46 -07:00
rmackay9
c034e38cbd
ArduCopter HIL: changed calls to setHIL to send in time as a uint32_t (it was a float)
2012-06-26 22:50:17 +09:00
Jason Short
91cde15c27
Attitude.pde - Added small boost to alt hold for takeoff.
2012-06-25 23:12:19 -07:00
Jason Short
711bbeb6f3
GCS_Mavlink.pde : mav_nav only used in legacy Mavlink.
2012-06-25 23:08:25 -07:00
Jason Short
4a85c40f03
Added Toy Mode control
2012-06-25 23:08:25 -07:00
Jason Short
03879d9113
Added Toy Mode defines
2012-06-25 23:08:25 -07:00
Jason Short
4872880134
Arducopter.pde : Added Approach mode, added "Toy" mode fun code I'm playing with.
...
Added landing code to make landing happen closer to home loc
Added check for distance to Loiter WP before overriding a new Loiter position.
Moved calc_loiter_pitch_roll() to 50 hz.
removed the nav_bearing var - not used with new crosstrack.
2012-06-25 23:08:25 -07:00
Jason Short
efc74a87aa
commands.pde: fixed unit error for distance check
2012-06-25 23:06:28 -07:00
Jason Short
7a5347fb1f
Config.h : New Gains based on testing, new Crosstrack gain. from 1.0 to .2 because of new algorithm
2012-06-25 23:06:28 -07:00
Jason Short
81c684664b
GCS Mavlink.pde: change reference to nav_bearing to target_bearing.
2012-06-25 23:06:28 -07:00
Jason Short
50b3ef66a7
Navigation.pde : removed old cross tracking from Arduplane. Added new 2D cross tracking. Added use of GPS velocity when above 1.5m/s
2012-06-25 23:06:28 -07:00
Jason Short
2fdbbb87f2
inertia.pde: WIP don't fly with inertia enabled until FN.
2012-06-25 23:06:28 -07:00
Jason Short
900f169c44
Log.pde: removed nav_bearing reference and replaced with target_bearing ref
2012-06-25 23:06:28 -07:00
Andreas M. Antonopoulos
678b12af25
AC2.6: Fix battery calculation and scaling bug for MAV1.0, now same as ArduPlane
...
http://code.google.com/p/arducopter/issues/detail?id=430
2012-06-24 17:01:25 -07:00
Robert Lefebvre
7eae382a22
Open up constraint on Rate Yaw Output for all copters.
2012-06-22 10:06:01 -04:00
Jason Short
014f0f9a99
Config.h - returned low to original 120
2012-06-20 15:22:35 -07:00
Jason Short
95f3041d25
Parameters.h: throttle_min and throttle_max now have defaults from Config.h
2012-06-20 15:02:00 -07:00
Jason Short
b8016dfe48
changed define to a param for throttle_min and throttle_max
2012-06-20 15:00:53 -07:00
Jason Short
ef847eecbb
changed define to param for throttle_min
2012-06-20 15:00:05 -07:00
Jason Short
8ef60f2d75
Added throttle_min as a user definable param
2012-06-20 14:58:34 -07:00
Jason Short
25a67c9953
lowered minimum throttle
2012-06-20 08:47:47 -07:00
Jason Short
0ccf5724aa
Small fix to angle boost - increases by about 20% to deal with inefficiencies of non-downward thrust
2012-06-20 08:47:47 -07:00
Jason Short
d7fab41234
decreased I term based on the tests last weekend in high winds
2012-06-20 08:47:47 -07:00
Jason Short
a0978e06e5
Adjustments to the Inertial_nav
...
lowered Rate_I and Rate_P to be less jumpy. raised throttle_p
added a clear to rate when entering loiter
moved the raw reporting
2012-06-20 08:47:47 -07:00
Andrew Tridgell
5525180814
MAVLink: make usage of MAVLink defines more consistent
2012-06-15 16:27:11 +10:00
rmackay9
6b16ca190f
ArduCopter: updated firmware to simply 2.6 (i.e. removed Epsilon) ahead of the release
2012-06-15 00:42:59 +09:00
Jason Short
e261c62e6b
Inertial Nav disabled by default
2012-06-13 22:37:52 -07:00
Jason Short
6dc1e02f76
Inertial Control
...
I added inertial navigation based on the simulator data. This is an option only available if you compile with Arduino and set
#define INERTIAL_NAV ENABLED
in the APM_Config.h file.
This has been tested for one real flight and did not crash my quad, but consider it very alpha. The quad may be unpredictable at first until the error correction fixes poorly calibrated accels. Be Careful.
Most of the real work is in the inertia file, but the error correction, new variable defines and calibration calls are sprinkled throughout.
The Log should record RAW messages with special debugging values.
2012-06-13 22:34:45 -07:00
rmackay9
3618ac62e0
ArduCopter: made Robert's new yaw method optional (off by default).
...
Add this line to APM_Config.h to enable Robert's yaw
#define ALTERNATIVE_YAW_MODE ENABLED
2012-06-13 21:50:16 +09:00
Jason Short
ee78818f5a
Raised the Max throttle to 1000, min to 200. Worked good in SIM with Tridge's motor safety patch.
2012-06-12 13:58:49 -07:00
rmackay9
c9093a1609
ArduCopter: updated firmware version to 2.6 Epsilon
2012-06-12 23:22:57 +09:00
rmackay9
1b9ed1444e
ArduCopter: updated standard loiter pids.
...
Loiter_P (speed from distance to target) = 0.2 (was 0.35)
Loiter_Rate_P (lean angle from desired acceleration) = 2.4 (was 2.5)
Loiter_Rate_I = unchanged at 0.08
Loiter_Rate_D = 0.40 (was 0.45)
2012-06-12 20:56:31 +09:00
Jason Short
ebff84d41e
Added Angel's name to contrib list
2012-06-10 12:38:22 -07:00
Andrew Tridgell
8f1121c980
GPS: Use appropiate GPS_ENGINE settings in APM, ACM and rover
2012-06-10 16:36:18 +10:00
rmackay9
df72f70aba
ArduCopter: updated firmware version to 2.6 Delta ahead of the next round of testing (and hopefully soon a release)
2012-06-08 21:54:09 +09:00
Andrew Tridgell
bfb2c1ee87
GPS: open the GPS serial port with a 256 byte buffer
...
the UBLOX needs more than 128 bytes for reliable parsing
2012-06-08 16:42:03 +10:00
Robert Lefebvre
3e6f37d540
Opening up the Yaw Rate constraint for Trad Heli.
2012-06-07 22:40:25 -04:00
Robert Lefebvre
1b789b7928
Yaw Fix
...
Modified Nav_Yaw controller to better track intended heading changes.
2012-06-07 17:15:33 -04:00
Jason Short
71111a5816
Stabilization patches
...
removed Angle error limit for stabilization
constricted Iterm to +- 5° error and limited the implementation to when the quad is +- 5° from center
doubled the output limit for Rate controller.
increased default Rate_P gain to .18 with matching Rate_D of .004
Tested in the SIM and in backyard. dramatically increases performance and quad no longer overshoots and flips when pushed hard.
2012-06-05 16:41:44 -07:00
rmackay9
cad76d4e0f
ArduCopter: updated firmware description to 2.6 Gamma
2012-06-05 21:28:13 +09:00
Andrew Tridgell
af1573ad30
ACM: prevent link flood with "Low Battery" warnings
...
thanks to Marco for noticing this
2012-06-05 11:31:40 +10:00
Michael Oborne
1423810247
AC: add hilstate message
2012-06-04 16:24:08 +08:00
Jason Short
9cadd8c1db
Bug fix: When adjusting altitude, RTL then land will fail unless this var is reset to false.
2012-06-03 22:25:27 -07:00
Jason Short
60c89ee117
Updates to Flip:
...
Ability to abort flip mode if things go wrong
init function to re-enter flip mode if aborted
2012-06-03 22:15:19 -07:00
Andrew Tridgell
13ae16e0c5
ACM: MAVLINK10 uses HIL_STATE
...
thanks to Michael for noticing this
2012-06-04 13:31:07 +10:00
Andrew Tridgell
8d28cb51fc
added mavlink09 targets
...
allows easier building with mavlink0.9
2012-06-04 13:14:52 +10:00
Andrew Tridgell
0721089acd
ACM: fixed HIL build for MAVLINK10
2012-06-04 13:14:52 +10:00
Michael Oborne
45c3c101fe
fix AC hil build
2012-06-04 11:12:52 +08:00
Michael Oborne
7d2532450a
enable mavlink10 by default
2012-06-04 08:02:08 +08:00
Jason Short
f2edc87797
Added note to remove this unused param
2012-06-03 11:13:50 -07:00
Jason Short
9723e52a01
using current PWM rather than a re-read of the PWM.
2012-06-03 11:13:50 -07:00
Jason Short
5ce93faf51
Moved PID logging counter into define
2012-06-03 11:13:50 -07:00
rmackay9
826cffe688
ArduCopter: Ensure update_GPS does nothing when gps is disabled.
...
This fixes a bug in which an APM without a GPS would not work because it would constantly scan for a valid GPS long after it should have given up and moved on.
2012-06-03 23:48:45 +09:00
rmackay9
68de4e0259
ArduCopter: updated firmware version to 2.6Beta in preparation for beginning of testing
2012-06-03 17:02:35 +09:00
rmackay9
09695602d2
ArduCopter: updated firmware version to 2.6Beta in preparation for beginning of testing
2012-06-03 16:59:23 +09:00
rmackay9
8f8e91a620
ArduCopter: Another attempt at fixing the lat/lon printing bug in which small negative lattitudes or longitudes were appearing as positives.
...
Fixed in both ArduCopter Log.pde and the GPS Auto test sketch
2012-06-03 16:58:19 +09:00
rmackay9
df3fb5c041
ArduCopter: fixed print_latlon bug in which it would print negative lat/lon numbers incorrectly (i.e. -1234567890 would be printed as -124.xxx).
2012-06-02 12:51:12 +09:00
Jason Short
477aa6e47a
RC_Channel fix for throttle output.
...
throttle was outputting incorrectly and allowing the user to max out the throttle leaving nothing for attitude control
2012-05-31 14:59:03 -07:00
Robert Lefebvre
bafb478924
TradHeli: Incorporating Ext ESC Control
2012-05-30 21:50:25 -04:00
Robert Lefebvre
3df1aac936
Change to increase Parameter space as we have run out.
...
This will decrease the max number of waypoints from 186
to 169.
2012-05-30 20:41:53 -04:00
Jason Short
abb426aec3
When RTLing, force home as the final location for loiter.
2012-05-30 11:06:41 -07:00
Jason Short
5b31f3ba27
moved detector to run until the throttle is low, then stop running.
2012-05-30 09:44:59 -07:00
Jason Short
42032f9845
Missed a Semicolon
2012-05-30 09:36:16 -07:00
Jason Short
e6ee50f53d
Altered the ground detector logic to no continuously run when landed
2012-05-30 09:34:31 -07:00
Jason Short
c45209eaff
Broken timer - removed
2012-05-29 12:56:38 -07:00
Jason Short
93d7712c9a
Removed unused variable
2012-05-29 12:43:23 -07:00
Jason Short
9ea54b3171
Lowered I term - causes oscillations in SIM
2012-05-29 12:43:01 -07:00
Jason Short
2ae5d50261
Renamed some variables to clarify functionality.
2012-05-29 12:42:37 -07:00
Jason Short
33d1b5a137
Speed up automatic disarming to 25 seconds for safety.
...
renamed AUTO_ARMING_DELAY to AUTO_DISARMING_DELAY
2012-05-29 12:41:35 -07:00
Jason Short
3ba6e1db7a
Removed references to a takeoff timer
2012-05-29 11:28:40 -07:00
Jason Short
c523a9822b
Failsafe: Looking for takeoff_complete now vs unreliable GPS
2012-05-29 11:25:04 -07:00
Jason Short
394f8c6eb0
pulling throttle low in flight turns out to be more common than thought. Removed clearing of takeoff_complete flag. This is still cleared during disarm which is automatic after 30 seconds of no throttle.
2012-05-29 11:25:04 -07:00
Jason Short
a3a90287f4
changed the way takeoff complete is figured. Looking for high throttle.
2012-05-29 11:25:04 -07:00
Jason Short
72758ff3ab
Added note to functionality
2012-05-29 11:25:04 -07:00
Jason Short
996cfc5c96
changed WP radius to AP_Int16
2012-05-28 22:39:29 -07:00
Jason Short
4ed48510dc
reversed circle_WP calculation so the next_WP refers to the destination around the circle and circle_WP refers to the center. The intent is to make it easier to see via ground station.
2012-05-27 09:21:20 -07:00
Jason Short
e2086decc6
Arducopter.pde : setting rtl_approach_alt above 1 would force auto landing even if auto-landing was disabled.
2012-05-23 22:00:56 -07:00
Andrew Tridgell
1fc8347af3
MAVLink: send time of GPS fix accurately
...
when we send a GPS_RAW message, set the usec field to the time we got
the fix from the GPS, not the current time. This makes it possible for
aerial photo processing to be more accurate, as the usec field with
more accurately reflect the planes position/time pair
2012-05-23 17:33:33 +10:00
Andrew Tridgell
5b5d43f5d0
Log: don't print '+' while erasing logs
...
we no longer do page based erase, so printing a + every 128 pages
makes no sense
2012-05-22 20:10:29 -07:00
Robert Lefebvre
df4246597f
Updates to CopterLEDS
...
Creation of Nav Blink Function.
2012-05-22 09:58:37 -04:00
Andrew Tridgell
27e7d425af
MAVLink: allow parameter fetch during mavlink_delay()
...
this allows the planner to fully connect to the APM with MAVLink while
doing a DataFlash erase
2012-05-22 16:13:35 +10:00
Jason Short
198da9c5e6
Flip.pde: renamed dcm to ahrs
2012-05-21 12:58:51 -07:00
Jason Short
f55da34496
Some bug fixes to Auto-flip. I ran this code through the sim and found these flaws.
2012-05-21 11:07:41 -07:00
Jason Short
99dee97385
Added note
2012-05-21 09:58:23 -07:00
Jason Short
6c999b5d54
Attitude.pde - Removed rate limit based on SIM flights. These should never have been in place and seriously detriment Acro flight.
2012-05-21 09:58:23 -07:00
Jason Short
f8ceec2b4b
added check for duplicate time-stamped GPS messages.
2012-05-18 09:54:18 -07:00
Jason Short
95076bf08e
navigation.pde:
...
removed unneeded WP_Distance check
remove unneeded return for Navigate
removed unneeded rate_D calcs
removed unused functions
2012-05-17 11:05:05 -07:00
Jason Short
be71cbfcc8
Arducopter.pde :
...
removed unneeded d_rate_filters
updated Nav routine to handle faster GPS updates
moved calc_XY_velocity to GPS read
added check for duplicate GPS reads
2012-05-17 11:05:05 -07:00
Jason Short
7278e8d1e5
removed retro loiter code since Angel has a branch now.
...
shrank speed filter to avoid latency
removed unused forward estimator code
placed code for switchover to gps.groundspeed at 1.5m/s
added clamp for D term when below .5m/s to eliminate noise
added hybrid I-term based on speed error and position
changes Loiter D term to use position rather than acceleration to avoid noise
2012-05-15 22:14:23 -07:00
Jason Short
cb68adfff2
Loiter Gains based on new SIM
2012-05-15 22:01:01 -07:00
Robert Lefebvre
17a1b6d672
Fixed Syntax error.
2012-05-15 12:35:35 -04:00
Robert Lefebvre
a9349a6e87
More CopterLEDS changes.
...
Merged CopterLEDS and Piezo functions to eliminate pin conflict on APM2. Created new Parameter bit to turn piezo function on and off from MP. Moved GPS and Aux pin assignments to allow commonality between APM1 and 2. Set LED_Mode parameter default to 9 in order to make CopterLEDS completely backwards compatible with old Motor LEDS and Piezo code. Legacy users should see no difference.
2012-05-15 12:00:21 -04:00
Robert Lefebvre
9e73dc4bd8
CopterLEDS changes for APM2
2012-05-15 10:07:03 -04:00
rmackay9
eaeaa3811a
ArduCopter: bug fix for reversing tri servo
...
Extended AP_MotorsTri class to take in pointer to rc_tail servo (rc_7) and we use this servo's REV parameter to determine whether to reverse the output to the tail servo or not
2012-05-13 12:36:46 +09:00
rmackay9
47ea92aa7f
ArduCopter: updated version to 2.5.5
2012-05-13 08:47:43 +09:00
rmackay9
ee20f887b5
ArduCopter: fixed compile error by declaring extern print_latlon
2012-04-30 21:44:27 +09:00
Andrew Tridgell
94b763fa1e
ACM: fixed HIL build
2012-04-30 22:42:17 +10:00
rmackay9
ed9c59879f
ArduCopter: restored gps test in CLI
...
Added check so not enabled when using 1280. Also fixed comments in other tests to explain the check for the 1280.
2012-04-30 17:29:50 +09:00
Adam M Rivera
292f9699fa
Parameters.pde/AP_MotorsHeli: Updated comments to leverage the new value aliases
2012-04-28 20:50:41 -05:00
Adam M Rivera
2a85a64b6e
Parameters.pde: Added value aliases to comments
2012-04-28 20:35:22 -05:00
Adam M Rivera
c03f1d04ea
Parameters.pde: Added more parameter comments.
2012-04-28 12:14:17 -05:00
Andrew Tridgell
8134c9a883
autotest: fixes for MAVLink 1.0 in autotest
2012-04-27 15:15:53 +10:00
Adam M Rivera
21886104a6
Parameters.pde/AP_MotorsHeli.cpp: Added comments from Roberts clone.
2012-04-26 18:26:14 -05:00
Adam M Rivera
09ffc69d93
Changed the marker for Group parameters to @Group.
2012-04-25 12:27:51 -05:00
Adam M Rivera
0132392e36
Parameters.pde: Added lib comments.
2012-04-25 11:23:46 -05:00
Adam M Rivera
74789273b7
Merge branch 'master' of https://code.google.com/p/ardupilot-mega into param-suffix
2012-04-24 14:11:54 -05:00
Adam M Rivera
f70a4e61ea
Parameters.pde: Updated comment schema to include the parameter name which becomes the XML node that contains the meta data.
2012-04-24 13:11:16 -05:00
Adam M Rivera
8c607d93fc
Parameters.pde: Added new comment structure to a few parameters for testing.
2012-04-24 11:37:33 -05:00
Andrew Tridgell
7866740d62
MAVLink: make ACM build with MAVLink 1.0 possible in arduino GUI
2012-04-24 22:24:58 +10:00
Andrew Tridgell
712b7184be
ACM: added support for MAVLink 1.0 to ArduCopter
...
most operations should now work
2012-04-24 19:54:20 +10:00
Adam M Rivera
2ee8237b5f
ArduCopter/Navigation: Updated code to reference the new g.retro_loiter param instead of the compile define.
2012-04-23 00:19:18 -05:00
Adam M Rivera
ec06638db6
Parameters: Added g.retro_loiter which is configurable by the user via the MP.
2012-04-23 00:17:52 -05:00
Adam M Rivera
788df5ed6f
config.h: Removed comment.
2012-04-23 00:16:41 -05:00
Adam M Rivera
692bbee233
Merge branch 'master' of https://code.google.com/p/ardupilot-mega into auto-approach
2012-04-23 00:03:37 -05:00
Jason Short
cb863dd483
Log.pde : Updated Flash Logging to log Floats properly vs scaled integers.
2012-04-21 15:25:53 -07:00
Jason Short
2aca6c64ab
Added a union for casting floats to ints and back when storing Floats to the DataFlash
2012-04-21 15:17:09 -07:00
rmackay9
3b5ffe0f61
ArduCopter - config.h - set standard RC_SPEED to 125 for helicopter frame
2012-04-21 23:46:36 +09:00
rmackay9
114e6a3551
ArduCopter - combined CH6_DAMP and CH6_STABILIZE_KD tuning parameters to avoid confusion
2012-04-21 23:24:57 +09:00
rmackay9
bd8534ef14
ArduCopter - Attitude.pde - added logging of optical flow pid controller
2012-04-21 20:17:12 +09:00
rmackay9
53ddb58c7b
ArduCopter - changed optflow object to be APM2 version if necessary
2012-04-21 20:15:55 +09:00
rmackay9
ce6dd8bb32
ArduCopter - changed Optical Flow for APM2 to use A3 pin
2012-04-21 20:15:16 +09:00