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Updated README.md

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Patrick Goebel 2012-12-21 19:41:21 -08:00
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README.md
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@ -122,14 +122,14 @@ Bring up your copy of the params file (my\_arduino\_params.yaml) in
your favorite text editor. It should start off looking like this:
<pre>
port: /dev/ttyACM0
port: /dev/ttyUSB0
baud: 57600
timeout: 0.1
rate: 50
sensorstate_rate: 10
use_base_controller: True
use_base_controller: False
base_controller_rate: 10
# === Robot drivetrain parameters
@ -139,26 +139,26 @@ base_controller_rate: 10
#gear_reduction: 1.0
#motors_reversed: True
# === PID parameters
# === PID parameters
#Kp: 20
#Kd: 12
#Ki: 0
#Ko: 50
# === Sensor definitions. Examples only - edit for your robot.
# Sensor type can be one of the follow (case sensitive!):
# Ping
# GP2D12
# Analog
# Digital
# PololuMotorCurrent
# === Sensor definitions. Examples only - edit for your robot.
# Sensor type can be one of the follow (case sensitive!):
# * Ping
# * GP2D12
# * Analog
# * Digital
# * PololuMotorCurrent
sensors: {
motor_current_left: {pin: 0, type: PololuMotorCurrent, rate: 5},
motor_current_right: {pin: 1, type: PololuMotorCurrent, rate: 5},
ir_front_center: {pin: 2, type: GP2D12, rate: 10},
sonar_front_center: {pin: 5, type: Ping, rate: 10},
arduino_led: {pin: 13, type: Digital, rate: 2, direction: output}
#motor_current_left: {pin: 0, type: PololuMotorCurrent, rate: 5},
#motor_current_right: {pin: 1, type: PololuMotorCurrent, rate: 5},
#ir_front_center: {pin: 2, type: GP2D12, rate: 10},
#sonar_front_center: {pin: 5, type: Ping, rate: 10},
arduino_led: {pin: 13, type: Digital, rate: 5, direction: output}
}
</pre>
@ -168,8 +168,7 @@ Let's now look at each section of this file.
_Port Settings_
The port will likely be either /dev/ttyACM0 or /dev/ttyUSB0 (e.g. for
an Xbee connection). Set accordingly.
The port will likely be either /dev/ttyACM0 or /dev/ttyUSB0. Set accordingly.
The MegaRobogaiaPololu Arudino sketch connects at 57600 baud by default.
@ -184,6 +183,8 @@ The *sensorstate\_rate* determines how often to publish an aggregated
list of all sensor readings. Each sensor also publishes on its own
topic and rate.
The *use\_base\_controller* parameter is set to False by default. Set it to True to use base control (assuming you have the required hardware.) You will also have to set the PID paramters that follow.
The *base\_controller\_rate* determines how often to publish odometry readings.
_Defining Sensors_
@ -234,10 +235,10 @@ You should see something like the following output:
<pre>
process[arduino-1]: started with pid [6098]
Connecting to Arduino on port /dev/ttyACM0 ...
Connecting to Arduino on port /dev/ttyUSB0 ...
Connected at 57600
Arduino is ready.
[INFO] [WallTime: 1355498525.954491] Connected to Arduino on port /dev/ttyACM0 at 57600 baud
[INFO] [WallTime: 1355498525.954491] Connected to Arduino on port /dev/ttyUSB0 at 57600 baud
[INFO] [WallTime: 1355498525.966825] motor_current_right {'rate': 5, 'type': 'PololuMotorCurrent', 'pin': 1}
[INFO]
etc
@ -251,7 +252,7 @@ Viewing Sensor Data
-------------------
To see the aggregated sensor data, echo the sensor state topic:
$ rostopic echo /arduino/sensors
$ rostopic echo /arduino/sensor_state
To see the data on any particular sensor, echo its topic name: