A Python Driver for MIT Mini-Cheetah Actuator which uses SocketCAN for communication.
Project description
Python Motor Driver for Mini Cheetah Actuator: T-Motor AK80-6
Dependencies:
- bitstring
Install via:
pip3 install bitstring
Documentation
- Useful videos:
- Datasheet
- Ben Katz Documentation
Pre-requisites:
-
Setting up the CAN interface:
-
Run this command and make sure that
can0
(or any other can interface depending on the system)shows up as an interface after connecting the USB cable to your laptop:ip link show
-
Configure the
can0
interface to have a 1 Mbaud communication frequency:sudo ip link set can0 type can bitrate 1000000
-
To bring up the
can0
interface, run:sudo ip link set up can0
-
-
To change motor parameters such as CAN ID or to calibrate the encoder, a serial connection is used. The serial terminal GUI used on linux for this purpose is
cutecom
Usage:
Import: from motor_driver.canmotorlib import CanMotorController
Example Motor Initialization: motor = CanMotorController(can_socket='can0', motor_id=0x01, motor_type='AK80_6_V2', socket_timeout=0.5)
Available Functions:
enable_motor()
disable_motor()
set_zero_position()
send_deg_command(position_in_degrees, velocity_in_degrees, Kp, Kd, tau_ff):
send_rad_command(position_in_radians, velocity_in_radians, Kp, Kd, tau_ff):
change_motor_constants(P_MIN_NEW, P_MAX_NEW, V_MIN_NEW, V_MAX_NEW, KP_MIN_NEW, KP_MAX_NEW, KD_MIN_NEW, KD_MAX_NEW, T_MIN_NEW, T_MAX_NEW)
All motor communication functions return current position, velocity, torque in SI units except for send_deg_command
. change_motor_constants
does not return anything.
Supported Motor Configurations:
- AK80-6 (From Cubemars, Firmware versions v1 and v2):
motor_type='AK80_6_V1'
andmotor_type='AK80_6_V2'
- AK80-9 (From Cubemars, Firmware version v2):
motor_type='AK80_9_V2'
# Working parameters for AK80-6 V1.0 firmware
AK80_6_V1_PARAMS = {
"P_MIN" : -95.5,
"P_MAX" : 95.5,
"V_MIN" : -45.0,
"V_MAX" : 45.0,
"KP_MIN" : 0.0,
"KP_MAX" : 500,
"KD_MIN" : 0.0,
"KD_MAX" : 5.0,
"T_MIN" : -18.0,
"T_MAX" : 18.0,
"AXIS_DIRECTION" : -1
}
# Working parameters for AK80-6 V2.0 firmware
AK80_6_V2_PARAMS = {
"P_MIN" : -12.5,
"P_MAX" : 12.5,
"V_MIN" : -38.2,
"V_MAX" : 38.2,
"KP_MIN" : 0.0,
"KP_MAX" : 500.0,
"KD_MIN" : 0.0,
"KD_MAX" : 5.0,
"T_MIN" : -12.0,
"T_MAX" : 12.0,
"AXIS_DIRECTION" : 1
}
# Working parameters for AK80-9 V2.0 firmware
AK80_9_V2_PARAMS = {
"P_MIN" : -12.5,
"P_MAX" : 12.5,
"V_MIN" : -25.64,
"V_MAX" : 25.64,
"KP_MIN" : 0.0,
"KP_MAX" : 500.0,
"KD_MIN" : 0.0,
"KD_MAX" : 5.0,
"T_MIN" : -18.0,
"T_MAX" : 18.0,
"AXIS_DIRECTION" : 1
}
To add a new constants configuration use the change_motor_constants
function or create an issue with the constants and motor information on the GitHub page to be added to the driver.
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