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==Screen dumps==
Back to [[regbot | Regbot]] main page


The user interface can configure and run the robot, as well as inspecting almost all values on the robot. Written in python using Qt GUI library.
==Overview==
 
Connection is either using USB or network if the robot has wifi.
 
On Windows USB is com3, com4 or any higher, see the device-list in the control panel.
 
On Linux USB is /dev/ttyACM0 or /dev/ttyACM1 if /dev/ttyACM0 is used for other devices.
 
 
The user interface can configure and run the robot, as well as inspect almost all values on the robot. Written in python using Qt GUI library.


The interface looks like on figures below.
The interface looks like on figures below.


[[File:regbot_gui_robot.png | 800px]]
In general:
* Yellow fields are read-only (updates from the robot when connected).
* White fields are editable
* Editable fields require (in general) that an "edit" button be pressed first and a "save" button after the edit.
* Many check-boxes get implemented as they are checked/unchecked, but not all.
* Data is updated from the robot at a relatively low update rate; if data is to be used for documentation, then use the onboard log function.
 
 
[[File:Gui_robot.png | 800px]]
 
Figure 1. The general settings for the robot. The left panel is the general connection status and space for some messages from the robot. The central tab is primarily for the configuration of the robot and some sensors and calculated values like pose and tilt. To the right is a fast graph of the last mission.
NB! The data rate is low, so to get an overview, use the log function for more details.
 
=== Data logger ===
 
[[File:Gui_rev0.png | 800px]]


Figure 1. The general settings for the robot. The left panel is the general connection status and space for som messages from the robot. The central tab is mostly for configuration of the robot and some sensor and calculated values like pose and tilt. To the right is a fast graph of the last mission.
Figure 2. The data logging options. A number of sensor values and interface points in the robot software can be logged. The text window shows loaded data from a mission. The log format is designed to be directly compatible with the 'load' function in MATLAB.


[[File:Gui_rev0.png]]
Use a script like this in MATLAB


Figure 2. The data logging options. A number of sensor values and interface points in the robot software can be logged. The window text window shows loaded data from a mission. The log format is designed to be directly compatible with the 'load' function in MATLAB.
clear
close all
% Liv (36)
%  1    time 2.005 sec
%  2  3  4  5  (mission 0), state 2, entered (thread 1, line 1), events 0x0 (bit-flags)
%  6  7 Motor voltage [V] left, right: 0.49 -2.11
%  8  9 Encoder left, right: 4294967021 25
% 10 11 Wheel velocity [m/s] left, right: -0.0885 0.0759
% 12 15 Chirp amplitude=0, frequency =0 rad/s, phase=0 rad, value=0
%%
data = '''load('log_position-liv36_b.txt')''';
%% plot motor voltage and velocity
figure(100)
hold off
plot(data(:,1), data(:,6), 'linewidth', 2)
hold on
plot(data(:,1), data(:,10), ':', 'linewidth', 2)
grid on
legend('left voltage [V]', 'left vel [m s^{-1}]', 'location','northwest');
xlabel('Time [sec]')


The GUI allows to make step responses for velocity and turn (and most of the other controllers). The step response is recorded in a buffer on the robot and is fetched in a MATLAB style file (as shown).
The top text lines of the log file are copied to the MATLAB script to ease the identification of data to plot.
Interface points that are recorded can be switched on and off to better utilize the limited buffer size on the robot (35kBytes).


[[File:Gui_ctrl_rev_1.png]]
====ACC and gyro====


Figure 3. This is a page to make a step response and insert controller values for velocity control. The same controller is used for both wheels.
Acceleration logs the acceleration values in m/s^2 on all 3 axes (x (forward if in balance),y (left), z (up if in balance))


[[File:regbot_gui_show_menu.png]]
Gyro is rotation velocity around the same 3-axis. Unit is degrees per second (after calibration offset).


Figure 4. Other tab pages are available from the "show" menu.
====Encoder====


==Mission==
Encoder values for wheel rotation (left, right) 48 values per rotation, increases on forward.


Mission specification consist of mission lines, each line consist of two (lower case) parts divided by ':'
====Motor voltage====


drive values : continue conditions (conditions are OR'ed)
Is the motor voltage - before conversion to PWM, compensated for changes in battery voltage.


e.g.:
====Motor current====
 
Filtered current sensor values. zero current is calibrated just before the start of a mission - this calibration sometimes makes a mistake, resulting in a wrong offset of the logged current. Value is in Amps. The value is filtered to match the log interval if the interval is > 2ms.
 
====Wheel velocity====
 
Based on the time between encoder tics. If more tics are within 1 ms, then the interval time is averaged. When there is a long time between tics (>50ms), then the time since the last tick is used to calculate velocity, i.e. velocity goes towards zero with time if no encoder pulses arrive.
 
==== Turn rate ====
 
The turn rate is based on encoder tics (not the gyro), the unit is radian/sec
 
==== Robot pose ====
 
The robot pose is position since the start of the mission (odometry coordinates), x,y,h,t where h is heading in radians (positive counterclockwise), and t is a tilt in radians (zero is in balance, positive is forward).
 
==== Line sensor ====
 
All values related to the line sensor, including AD value from each sensor.
 
==== IR sensor ====
 
Is distance converted to meters for each sensor (default is sensor 1 to the right and sensor 2 is forward).
==== Battery ====
 
Battery voltage in Volts.
 
==== Extra ====
 
Debug feature for log of extra values.
 
==== Mission ====
 
State, Thread, Line, Event. Where State is mission state (should always be 2 or 8 when stopping), thread number and line number in that thread, for the latest line activated (if more than one is activated in the same log interval, then the latest is logged. An event is a 32-bit integer where each bit corresponds to an event number, and events are accumulated over the logging period.
 
==== Motor ref ====
 
Is the desired motor velocity (input to velocity controller) - in m/s
 
==== Control time ====
 
Is the time taken to handle sensor data, calculate control values and advance in mission lines - this should be finised within 1ms. Value is in microseconds, so it should be below 1000 to ensure valid control calculations.
 
==== Control details ====


vel=-0.2, acc=3.0 : dist=1, time=12
Value order: r, m, m2, uf, r2, ep, up, ui, u1, u


Drive backwards at a speed of 0.2m/s, accelerate with 3m/s2 for 1 meter (or max 12 seconds)
The control details give details at data points connected to or inside the general PID controller design used for all control settings. These control data points are illustrated in the figure below.


=== Drive values ===
===Controller configuration===


* VEL is velocity in m/s - positive is forward, 0=stop. uses last value if omitted.
All controllers can be configured from the "control" tab. See the [[Control]] page for more control details.


* ACC is acceleration limit in m/s2. Uses last value if omitted.
[[File:Gui_control.png | 800px]]


* TR is turnradius in metre - positive, 0 is turn on the spot. straight if omitted
Figure 4b. All control values are set from this page; click on the relevant controller and enter the relevant values in the dialogue window shown below.


* LOG is log interval in milliseconds. Once started it continues until buffer is full.
[[File:Gui_control_dialog.png | 500px]]


* BAL is balancing, uses last value if omitted.
Figure 5. This dialogue configures the wheel velocity controller - shown as a PI-Lead-controller with feed-forward and an output limit at (+/-) 9V. All other options are disabled. The blue frame boxes indicate a traditional PID controller with lead in forward (and)/or in the feedback branch.


* LABEL is a label number that can be used by GOTO.
When "enable controller" is disabled, then the control is disabled.  


* GOTO is a jump to the label number given. This can be limited to COUNT
To use feed-forward only (i.e. set output directly from ref), enable controller, but set Kp=0, and enable feed-forward with some value for Kf (when Kf = 1, then ref is used directly as output).


====Line-sensor====
NB! As velocity measurements are rather noisy, the filter in the feedback path (Lead/Lag feedback) could be implemented as a low-pass filter with tau_zero = 0 and tau_pole = 0.005 (recommended).


If a line sensor is installed, then the following should work too:
=== IMU===


* LINER is following Right side of line at -2..2 (in cm), positive is right
The IMU page shows data from the IMU and is used for tilt measurement for the balance controller only.


* LINEL is following Left side of line at -2..2 (in cm), positive is right
[[File:Gui_IMU.png | 800px]]


* WHITE set to 1 if follow-line tape is white, else 0
Figure 5.1 IMU data. The graph shows calibrated values, and the gyro is calibrated by keeping the robot stable and pressing the "calibrate" button. (remember to save the result in robot flash). The servos drift slightly, so repeat if needed.


====Distance sensor====
A new feature has been added to set the orientation of the IMU board, but it is not shown in the image.


If IR distance sensors are installed, then these should work:
=== Menu ===


* IRSENSOR is IR-sensor to use (1 is distance to a wall, and 2 is distance in front).


* IRDist is IR-distance to hold.


===Continue conditions===
[[File:regbot_gui_show_menu.png | 600px]]


':' is separation of parameters and continue condition.
Figure 6. Other tab pages are available from the "show" menu.


* DIST is driven distance in this mission line - positive meters
===Mission===
* TURN is angle turned in this mission line - degrees, positive is CCV
* TIME is max time in this mission line - positive seconds
* COUNT is used with GOTO and GOTO will be ignored, if this line is executed more than this count


==== Line sensor ====
Missions are entered through the mission tab:
* XB, XW is test for crossing black/white line, value is 0..20, 0 is true on no crossing, 1..20 is confidence in crossing (20 is highest)


Example: Drive until a crossing black line is found or 2.5m is driven, then continue until the crossing line is gone (reached other side of line) and stop
[[File:Gui_mission.png | 700px]]


vel=0.2, log=5, acc=2: xb>16, dist=2.5
Figure 7. Missions are entered in the left (white) area, and can be syntax tested with the button above.
:xb < 4,dist=0.2
The result of the check is shown in the yellow area (right).
vel=0:time=0.1
The mission of the robot can be fetched to the right area.
Missions (the left area) can be saved and loaded from text files with the buttons below.


Example: Follow left edge of a white line until
If you copy-paste from another application, so make sure not to include any formatting; 7-bit ASCII characters are allowed only.


==== Distance sensor====
Missions are not saved to the robot before you press "save to robot".


* LV is test for valid line 0=true for no valid line, 1=true for valid line. IR1, IR2 is test for distance measured by IR sensor. TILT is test for tilt angle (0 is balance point)
The mission is lost for the robot after a power cycle unless you save the configuration to robot flash - using the "save to robot flash" in the left pane.


===Examples===
==== Mission lines ====


e.g.: drive-turn-drive-turn at 20cm/s:  
Mission specification consists of mission lines; each line consists of two (lower case) parts divided by ':'


  vel=0.2, acc=1.5 : dist = 0.5, time=5
  drive parameter: continue condition
tr=0.15 : turn=90
: dist = 0.5
tr=0.15 : turn=90
vel=0 : time=1


e.g. wait 5 seconds
continue conditions are OR'ed.


vel=0 : time=5
e.g.:  


===Save ===
vel=-0.2, acc=3.0 : dist=1, time=12
Transfer the mission to the robot RAM by pressing "Save" (top right), the mission will be lost by a reboot or power off, unless saved on robot!


Save the mission on the robot flash memory (EE-prom) by pressing "save on Robot" (left panel). NB! The space is limited (about 100 lines)!
Drive backwards at a speed of 0.2m/s, and accelerate with 3m/s2 to this speed until a distance of 1 meter is driven or 12 seconds have passed.


The mission can also be saved in a text-file useing the bottom right save button
See [[Mission]] for more details.

Latest revision as of 09:09, 17 November 2023

Back to Regbot main page

Overview

Connection is either using USB or network if the robot has wifi.

On Windows USB is com3, com4 or any higher, see the device-list in the control panel.

On Linux USB is /dev/ttyACM0 or /dev/ttyACM1 if /dev/ttyACM0 is used for other devices.


The user interface can configure and run the robot, as well as inspect almost all values on the robot. Written in python using Qt GUI library.

The interface looks like on figures below.

In general:

  • Yellow fields are read-only (updates from the robot when connected).
  • White fields are editable
  • Editable fields require (in general) that an "edit" button be pressed first and a "save" button after the edit.
  • Many check-boxes get implemented as they are checked/unchecked, but not all.
  • Data is updated from the robot at a relatively low update rate; if data is to be used for documentation, then use the onboard log function.


Figure 1. The general settings for the robot. The left panel is the general connection status and space for some messages from the robot. The central tab is primarily for the configuration of the robot and some sensors and calculated values like pose and tilt. To the right is a fast graph of the last mission. NB! The data rate is low, so to get an overview, use the log function for more details.

Data logger

Figure 2. The data logging options. A number of sensor values and interface points in the robot software can be logged. The text window shows loaded data from a mission. The log format is designed to be directly compatible with the 'load' function in MATLAB.

Use a script like this in MATLAB 

clear
close all
% Liv (36)
%  1    time 2.005 sec
%  2  3  4  5   (mission 0), state 2, entered (thread 1, line 1), events 0x0 (bit-flags)
%  6  7 Motor voltage [V] left, right: 0.49 -2.11
%  8  9 Encoder left, right: 4294967021 25
% 10 11 Wheel velocity [m/s] left, right: -0.0885 0.0759
% 12 15 Chirp amplitude=0, frequency =0 rad/s, phase=0 rad, value=0
%%
data = load('log_position-liv36_b.txt');
%% plot motor voltage and velocity
figure(100)
hold off
plot(data(:,1), data(:,6), 'linewidth', 2)
hold on
plot(data(:,1), data(:,10), ':', 'linewidth', 2)
grid on
legend('left voltage [V]', 'left vel [m s^{-1}]', 'location','northwest');
xlabel('Time [sec]')

The top text lines of the log file are copied to the MATLAB script to ease the identification of data to plot.

ACC and gyro

Acceleration logs the acceleration values in m/s^2 on all 3 axes (x (forward if in balance),y (left), z (up if in balance))

Gyro is rotation velocity around the same 3-axis. Unit is degrees per second (after calibration offset).

Encoder

Encoder values for wheel rotation (left, right) 48 values per rotation, increases on forward.

Motor voltage

Is the motor voltage - before conversion to PWM, compensated for changes in battery voltage.

Motor current

Filtered current sensor values. zero current is calibrated just before the start of a mission - this calibration sometimes makes a mistake, resulting in a wrong offset of the logged current. Value is in Amps. The value is filtered to match the log interval if the interval is > 2ms.

Wheel velocity

Based on the time between encoder tics. If more tics are within 1 ms, then the interval time is averaged. When there is a long time between tics (>50ms), then the time since the last tick is used to calculate velocity, i.e. velocity goes towards zero with time if no encoder pulses arrive.

Turn rate

The turn rate is based on encoder tics (not the gyro), the unit is radian/sec

Robot pose

The robot pose is position since the start of the mission (odometry coordinates), x,y,h,t where h is heading in radians (positive counterclockwise), and t is a tilt in radians (zero is in balance, positive is forward).

Line sensor

All values related to the line sensor, including AD value from each sensor.

IR sensor

Is distance converted to meters for each sensor (default is sensor 1 to the right and sensor 2 is forward).

Battery

Battery voltage in Volts.

Extra

Debug feature for log of extra values.

Mission

State, Thread, Line, Event. Where State is mission state (should always be 2 or 8 when stopping), thread number and line number in that thread, for the latest line activated (if more than one is activated in the same log interval, then the latest is logged. An event is a 32-bit integer where each bit corresponds to an event number, and events are accumulated over the logging period.

Motor ref

Is the desired motor velocity (input to velocity controller) - in m/s

Control time

Is the time taken to handle sensor data, calculate control values and advance in mission lines - this should be finised within 1ms. Value is in microseconds, so it should be below 1000 to ensure valid control calculations.

Control details

Value order: r, m, m2, uf, r2, ep, up, ui, u1, u

The control details give details at data points connected to or inside the general PID controller design used for all control settings. These control data points are illustrated in the figure below.

Controller configuration

All controllers can be configured from the "control" tab. See the Control page for more control details.

Figure 4b. All control values are set from this page; click on the relevant controller and enter the relevant values in the dialogue window shown below.

Figure 5. This dialogue configures the wheel velocity controller - shown as a PI-Lead-controller with feed-forward and an output limit at (+/-) 9V. All other options are disabled. The blue frame boxes indicate a traditional PID controller with lead in forward (and)/or in the feedback branch.

When "enable controller" is disabled, then the control is disabled.

To use feed-forward only (i.e. set output directly from ref), enable controller, but set Kp=0, and enable feed-forward with some value for Kf (when Kf = 1, then ref is used directly as output).

NB! As velocity measurements are rather noisy, the filter in the feedback path (Lead/Lag feedback) could be implemented as a low-pass filter with tau_zero = 0 and tau_pole = 0.005 (recommended).

IMU

The IMU page shows data from the IMU and is used for tilt measurement for the balance controller only.

Figure 5.1 IMU data. The graph shows calibrated values, and the gyro is calibrated by keeping the robot stable and pressing the "calibrate" button. (remember to save the result in robot flash). The servos drift slightly, so repeat if needed.

A new feature has been added to set the orientation of the IMU board, but it is not shown in the image.

Menu

Figure 6. Other tab pages are available from the "show" menu.

Mission

Missions are entered through the mission tab:

Figure 7. Missions are entered in the left (white) area, and can be syntax tested with the button above. The result of the check is shown in the yellow area (right). The mission of the robot can be fetched to the right area. Missions (the left area) can be saved and loaded from text files with the buttons below.

If you copy-paste from another application, so make sure not to include any formatting; 7-bit ASCII characters are allowed only.

Missions are not saved to the robot before you press "save to robot".

The mission is lost for the robot after a power cycle unless you save the configuration to robot flash - using the "save to robot flash" in the left pane.

Mission lines

Mission specification consists of mission lines; each line consists of two (lower case) parts divided by ':' 

drive parameter: continue condition

continue conditions are OR'ed.

e.g.: 

vel=-0.2, acc=3.0 : dist=1, time=12

Drive backwards at a speed of 0.2m/s, and accelerate with 3m/s2 to this speed until a distance of 1 meter is driven or 12 seconds have passed.

See Mission for more details.

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