Phidgets Motor Encoder
From wikidb
References
- Four Port Encoder Phidgets Guide This one didn't work because ROS wants a serial number of each port. This one has a single serial number for all ports.
- Single Port Encoder Phidget Guide There are two of these.
- ROS Phidgets Documentation
- Testing on Mac
Check
rosrun phidgets manager |- # -|- Type -|- Serial No. -|- Version -| |-------|----------------------------------|--------------|------------| |- 0 -|- PhidgetEncoder -|- 351673 -|- 302 -| |-------|----------------------------------|--------------|------------| |- 1 -|- PhidgetInterfaceKit -|- 69535 -|- 825 -| |-------|----------------------------------|--------------|------------| |- 2 -|- PhidgetMotorControl -|- 147489 -|- 102 -| |-------|----------------------------------|--------------|------------| |- 3 -|- PhidgetEncoder -|- 351547 -|- 302 -| |-------|----------------------------------|--------------|------------|
Modified the serial numbers for the left and right encoders in the odometry.launch file in the ..../floor_hugger/launch directory.
diff odometry.launch.org odometry.launch 15c15 < <param name="serial" value="52980" /> --- > <param name="serial" value="351547" /> 19c19 < <param name="serial" value="54104" /> --- > <param name="serial" value="351673" /> 24,25c24,25 < <param name="serialleft" value="52980" /> < <param name="serialright" value="54104" /> --- > <param name="serialleft" value="351547" /> > <param name="serialright" value="351673" />
Execute
Terminal 1
roscore
Terminal 2
roslaunch floor_hugger odometry.launch ... logging to /home/eepp/.ros/log/184aed3a-ee5e-11e5-86af-7c5cf84b92a4/roslaunch-hood-4875.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB. started roslaunch server http://hood:48802/ SUMMARY ======== PARAMETERS * /encoder_left/serial: 351547 * /encoder_right/serial: 351673 * /odometry/countspermmleft: 100 * /odometry/countspermmright: 100 * /odometry/serialleft: 351547 * /odometry/serialright: 351673 * /odometry/verbose: True * /odometry/wheelbase: 400 * /rosdistro: indigo * /rosversion: 1.11.16 NODES / encoder_left (phidgets/high_speed_encoder) encoder_right (phidgets/high_speed_encoder) odometry (phidgets/odometry) ROS_MASTER_URI=http://hood:11311 core service [/rosout] found process[encoder_left-1]: started with pid [4893] process[encoder_right-2]: started with pid [4894] process[odometry-3]: started with pid [4910] [ INFO] [1458453025.200790426]: Left encoder: phidgets/encoder/351547 [ INFO] [1458453025.205863972]: Right encoder: phidgets/encoder/351673
Terminal 3
This example shows the topic echo while one motor is powered without it be connected to a Phidgets motor driver. The "pose" section displays the current position. The "twist" section displays the change in position impacted by the twist of the robot.
rostopic echo odom
---
header:
seq: 35304
stamp:
secs: 1458454629
nsecs: 943339159
frame_id: odom
child_frame_id: base_link
pose:
pose:
position:
x: -0.300059982299
y: 0.565528418531
z: 0.0
orientation:
x: -0.0
y: 0.0
z: 0.151113732152
w: -0.988516383251
covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
twist:
twist:
linear:
x: 0.0177976840035
y: -0.00553014091365
z: 0.0
angular:
x: 0.0
y: 0.0
z: -0.093185371335
covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
---
