This library provides easy-to-use Python modules and methods for interfacing with Acrome Smart Motor Driver products.
Embrace the world of motor control with simplicity using our SMD Python Library. Designed specifically for controlling SMDs, this library provides a seamless experience no matter your skill level in how you control motors.
Whether your project requires basic speed adjustments or precise position control, quickly and easily leverage the flexibility of Python to effortlessly implement a wide variety of motor control strategies.
SMD Python Library takes your projects to the next level by offering seamless integration with SMD Sensor modules. With this library, you can increase the functionality and efficiency of your project by effortlessly collecting data from SMD sensor modules via SMD.
Develop your projects with "Acrome Smart Motor Drivers" and a computer that can run your Python code.
You can reach the Acrome Smart Motors Drivers documentation here.
To use Acrome Smart Motor Drivers with python library, follow the installation steps below. Library is compatible with Python 3.x and can be installed on both Windows and Linux systems.
Before you begin, make sure you have the following prerequisites:
Open a Command Prompt with administrative privileges.
Install SMD library using pip (Python package manager) by running the following command:
pip install acrome-smd
Open a terminal.
Install SMD library using pip (Python package manager) by running the following command:
pip install acrome-smd
To verify that SMD library has been successfully installed, open a Python interpreter and run the following command:
import smd
import smd.red
If no errors are raised, the installation was successful.
To upgrade SMD Library to the latest version, you can use the following pip command:
pip install acrome-smd
Import the SMD Library: First, import the SMD library at the beginning of your Python script:
from smd.red import *
Create an instance of the Master class by initializing it with the appropriate settings. This instance represents your SMD and allows you to control it.
ID = 0 # Set the ID of your SMART MOTOR DRIVER
SerialPort = '/dev/ttyUSB0' # Replace with your specific serial port ( for ex 'COM3'.)
baudrate = 115200 # Set the baud rate for serial communication
myMaster = Master(SerialPort , baudrate) #create a master object
print(master.scan()) #prints ID list of connected SMDs
from smd.red import *
import time
MASTER_PORT = "/dev/ttyUSB0" #depending on operating system, port, etc. may vary depending on the
master = Master(MASTER_PORT) #creating master object
print(master.scan()) #prints ID list of connected SMDs
ID = master.attached()[0] #getting ID of first SMD from scanned ones.
#ID = 0 You can use directly this if it has never been changed before.
Configure SMD:
#rpm and cpr values are depend on the motor you use.
master.set_shaft_rpm(ID, 10000)
master.set_shaft_cpr(ID, 64)
#starts autotune for setting PID values of control algorithms
master.pid_tuner(ID)
You can configure and use the SMD using specific methods belonging to the master class, just like in the code above.
You can access all sample codes from here. Please read full documentation to use all features of a SMD
The following methods provide users with ability to update firmware of their SMDs. To use these methods users must have an internet connection. Users should not disconnect power from the device or it may break the device.
get_latest_fw_version(self)Return: Latest firmware version
This method gets the latest firmware version from the Github servers.
update_fw_version(self, id: int, version='')Return: True if the firmware is updated
This method updates the firmware version with respect to given version string and ID.
id argument is the device ID of the connected driver.
version argument is the version to be updated. If version string is not given, driver is updated to the latest version available on Github.
The control modes on the SMD operate with PID control. Therefore, correctly tuning the P, I, and D constants is crucial for accurate control. The device features an autotune capability to automatically set these values. Alternatively, users can manually input these values if desired.
To utilize the autotune feature on the device, it's essential to ensure that the motor is in a freely rotatable position. This is because the card continuously rotates the motor during the autotuning process.
Following this, the next step is to input the motor's CPR (Counts Per Revolution) and RPM (Revolutions Per Minute) values into the card using the provided methods below. Failing to do this accurately may result in incorrect calculations.
set_shaft_cpr(self, id: int, cpr: float)Return: None
This method sets the count per revolution (CPR) of the motor output shaft.
id argument is the device ID of the connected driver.
cpr argument is the CPR value of the output shaft
set_shaft_rpm(self, id: int, rpm: float)Return: None
This method sets the revolution per minute (RPM) value of the output shaft at 12V rating.
id argument is the device ID of the connected driver.
rpm argument is the RPM value of the output shaft at 12V
After completing these steps, you should initiate the tuning process using the pid_tuner() method. Please note that immediately after calling this method, the motors will start rotating with varying speeds.
pid_tuner(self, id: int)Return: None
This method starts a PID tuning process. Shaft CPR and RPM values must be configured beforehand. If CPR and RPM values are not configured, motors will not spin.
id argument is the device ID of the connected driver.
Once the pid_tuner() method is initiated, the state of the torque (whether it's enabled or not) does not affect motor operation. There is no need to use the enable_torque() function.
from smd.red import *
import time
MASTER_PORT = "/dev/ttyUSB0" #depending on operating system, port, etc. may vary depending on the
master = Master(MASTER_PORT) #creating master object
print(master.scan()) #prints ID list of connected SMDs
ID = master.attached()[0] #getting ID of first SMD from scanned ones. You can use directly ID = 0 if it has never been changed before.
master.set_shaft_rpm(ID,10000) #rpm and cpr values are depend on the motor you use.
master.set_shaft_cpr(ID,64)
master.pid_tuner(ID) #starts autotune for setting PID values of control algorithms
Manual input of the necessary constants for PID control is also possible. For this, separate P, I, and D constants should be configured for each control mode. Please note that each mode utilizes its own set of constants to control the motor. There are dedicated methods for configuring these constants for each control mode.
set_control_parameters_position(self, id: int, p=None, i=None, d=None, db=None, ff=None, ol=None)Return: None
This method sets the control block parameters for position control mode.
Only assigned parameters are written, `None`'s are ignored. The default
max output limit is 950.
`id` argument is the device ID of the driver.
`p` argument is the the proportional gain. Defaults to None.
`i` argument is the integral gain. Defaults to None.
`d` argument is the derivative gain. Defaults to None.
`db` argument is the deadband (of the setpoint type) value. Defaults to None.
`ff` argument is the feedforward value. Defaults to None.
`ol` argument is the maximum output limit. Defaults to None.
set_control_parameters_velocity(self, id: int, p=None, i=None, d=None, db=None, ff=None, ol=None)Return: None
This method sets the control block parameters for velocity control mode.
Only assigned parameters are written, `None`'s are ignored. The default
max output limit is 950.
`id` argument is the device ID of the driver.
`p` argument is the the proportional gain. Defaults to None.
`i` argument is the integral gain. Defaults to None.
`d` argument is the derivative gain. Defaults to None.
`db` argument is the deadband (of the setpoint type) value. Defaults to None.
`ff` argument is the feedforward value. Defaults to None.
`ol` argument is the maximum output limit. Defaults to None.
set_control_parameters_torque(self, id: int, p=None, i=None, d=None, db=None, ff=None, ol=None)Return: None
This method sets the control block parameters for torque control mode.
Only assigned parameters are written, `None`'s are ignored. The default
max output limit is 950.
`id` argument is the device ID of the driver.
`p` argument is the the proportional gain. Defaults to None.
`i` argument is the integral gain. Defaults to None.
`d` argument is the derivative gain. Defaults to None.
`db` argument is the deadband (of the setpoint type) value. Defaults to None.
`ff` argument is the feedforward value. Defaults to None.
`ol` argument is the maximum output limit. Defaults to None.
The P, I, and D constants and other values entered for control modes can be obtained. This can be achieved by using the methods provided below.
get_control_parameters_position(self, id: int)Return: Returns the list [P, I, D, Feedforward, Deadband, OutputLimit]
This method gets the position control block parameters.
id argument is the device ID of the driver.
get_control_parameters_velocity(self, id: int)Return: Returns the list [P, I, D, Feedforward, Deadband, OutputLimit]
This method gets the velocity control block parameters.
id argument is the device ID of the driver.
get_control_parameters_torque(self, id: int)Return: Returns the list [P, I, D, Feedforward, Deadband, OutputLimit]
This method gets the torque control block parameters.
id argument is the device ID of the driver.
from smd.red import *
import time
MASTER_PORT = "/dev/ttyUSB0"
master = Master(MASTER_PORT) #creating master object
print(master.scan())
ID = 0 #ID of the SMD connected and autotuned.
print(master.get_control_parameters_position(ID))
print(master.get_control_parameters_velocity(ID))
The SMD Red has 4 control modes:
PWM Control: This mode provides power to a brushed DC motor using PWM signals.
Position Control: In this mode, the brushed motor moves to the desired positions using information from the encoder.
Velocity Control: This mode ensures that the motor rotates at the desired speed using data from the encoder.
Torque Control: This mode allows the motor to apply a specific torque by drawing the desired current.
Except for the PWM Control mode, all of these control modes operate with PID control. Therefore, it is essential to configure the PID values before starting the motors in these control modes. Without proper PID tuning, the motors may not work at all or may not perform as desired. You can find the necessary information for setting PID values in the PID Tune section of the documentation.
Regardless of which control mode you choose to use, there are two essential methods that you need to be aware of. One is the set_operation_mode() method, which allows you to select the motor control mode you want to use. The other is enable_torque(), which enables or disables the motor rotation.
set_operation_mode(self, id: int, mode: OperationMode)Return: None
This method sets the operation mode of the driver. Operation mode may be one of the following:
OperationMode.PWM,OperationMode.Position,OperationMode.Velocity,OperationMode.Torque.id argument is the device ID of the connected driver.
enable_torque(self, id: int, en: bool)Return: None
This method enables or disables power to the motor which is connected to the driver.
id argument is the device ID of the connected driver.
en argument is a boolean. True enables the torque while False disables.
set_duty_cycle(self, id: int, pct: float):Return: None
This method sets the duty cycle to the motor for PWM control mode in terms of percentage. Negative values will change the motor direction.
id argument is the device ID of the driver.
id argument is the duty cycle percentage.
from smd.red import *
MASTER_PORT = "COM10"
master = Master(MASTER_PORT) #creating master object
print(master.scan())
ID = 0
master.set_operation_mode(ID, 0) #sets the operating mode to 0 represents PWM control mode.
master.set_duty_cycle(ID, 50) #sets the duty cycle to 50 percent
master.enable_torque(ID, True) #enables the motor torque to start rotating
set_position_limits(self, id: int, plmin: int, plmax: int)Return: None
This method sets the position limits of the motor in terms of encoder ticks. Default for min is -2,147,483,648 and for max is 2,147,483,647. The torque is disabled if the value is exceeded so a tolerence factor should be taken into consideration when setting these values.
id argument is the device ID of the connected driver.
plmin argument is the minimum position limit.
plmax argument is the maximum position limit.
get_position_limits(self, id: int)Return: Min and max position limits
This method gets the position limits of the motor in terms of encoder ticks.
id argument is the device ID of the connected driver.
plmin argument is the minimum position limit.
plmax argument is the maximum position limit.
set_position(self, id: int, sp: int)Return: None
This method sets the desired setpoint for the position control in terms of encoder ticks.
id argument is the device ID of the driver.
sp argument is the position control setpoint.
get_position(self, id: int)Return: Current position of the motor shaft
This method gets the current position of the motor from the driver in terms of encoder ticks.
id argument is the device ID of the driver.
from smd.red import *
MASTER_PORT = "COM10"
master = Master(MASTER_PORT) #creating master object
print(master.scan())
ID = 0
master.set_shaft_rpm(ID, 10000) #rpm and cpr values are depend on the motor you use.
master.set_shaft_cpr(ID, 64)
master.set_control_parameters_position(ID, 10, 0, 8) #SMD ID, Kp, Ki, Kd
master.set_operation_mode(ID, 1) #sets the operating mode to 1 represents Position control mode.
master.enable_torque(ID, True) #enables the motor torque to start rotating
while True:
master.set_position(ID, 5000) #sets the setpoint to 5000 encoder ticks.
time.sleep(1.2)
master.set_position(ID, 0) #sets the setpoint to 0 encoder ticks. Motor goes to start
time.sleep(1.2)
You should enter the PID values of Position Control Mode or just tune once the SMD at start. CPR and RPM values should be entered to SMD calculates the neseccary varaibles. If you don't then the motor cannot rotate.
set_velocity_limit(self, id: int, vl: int)Return: None
This method sets the velocity limit for the motor output shaft in terms of RPM. The velocity limit applies only in velocity mode. Default velocity limit is 65535.
id argument is the device ID of the connected driver.
vl argument is the new velocity limit (RPM).
get_velocity_limit(self, id: int)Return: Velocity limit
This method gets the velocity limit from the driver in terms of RPM.
id argument is the device ID of the connected driver.
set_velocity(self, id: int, sp: int)Return: None
This method sets the desired setpoint for the velocity control in terms of RPM.
`id` argument is the device ID of the driver.
get_velocity(self, id: int)Return: Current velocity of the motor shaft
This method gets the current velocity of the motor output shaft from the driver in terms of RPM.
`id` argument is the device ID of the driver.
from smd.red import *
MASTER_PORT = "COM10"
master = Master(MASTER_PORT) #creating master object
print(master.scan())
ID = 0
master.set_shaft_rpm(ID,10000) #rpm and cpr values are depend on the motor you use.
master.set_shaft_cpr(ID,64)
master.set_control_parameters_velocity(ID,10,1,0) #SMD ID, Kp, Ki, Kd
master.set_operation_mode(ID, 2) #sets the operating mode to 2 represents Velocity control mode.
master.set_velocity(ID, 2000) #sets the setpoint to 2000 RPM.
master.enable_torque(ID, True) #enables the motor torque to start rotating
You should enter the PID values of Position Control Mode or just tune once the SMD at start. CPR and RPM values should be entered to SMD calculates the neseccary varaibles. If you don't then the motor cannot rotate.
set_torque_limit(self, id: int, tl: int)Return: None
This method sets the torque limit of the driver in terms of milliamps (mA).
id argument is the device ID of the connected driver.
tl argument is the new torque limit (mA).
get_torque_limit(self, id: int)Return: Torque limit (mA)
This method gets the torque limit from the driver in terms of milliamps (mA).
id argument is the device ID of the connected driver.
set_torque(self, id: int, sp: int)Return: None
This method sets the desired setpoint for the torque control in terms of milliamps (mA).
id argument is the device ID of the driver.
get_torque(self, id: int)Return: Current drawn from the motor (mA)
This method gets the current drawn from the motor from the driver in terms of milliamps (mA).
id argument is the device ID of the driver.
from smd.red import *
MASTER_PORT = "COM10"
master = Master(MASTER_PORT) #creating master object
print(master.scan())
ID = 0
master.set_shaft_rpm(ID,10000) #rpm and cpr values are depend on the motor you use.
master.set_shaft_cpr(ID,64)
master.set_control_parameters_torque(ID, 10, 0.1, 0) #SMD ID, Kp, Ki, Kd
#master.set_torque_limit(220)
master.set_operation_mode(ID, 3) #sets the operating mode to 3 represents Torque control mode.
master.set_torque(ID, 80) #sets the setpoint to 80 mili amps(mA).
master.enable_torque(ID, True) #enables the motor torque to start rotating
You must enter the PID values of the Torque Control Mode. Since Auto tune does not produce these values, you must set them yourself. If you do not do this, the motor cannot rotate properly.
Methods of the Red class are used for the underlying logic of the Master class. As such, it is not recommended for users to call Red class methods explicitly. Users may create instances of the class in order to attach to the master. Thus, only __init__ constructor is given here.
__init__(self, ID: int):This is the initalizer for Red class which represents an object of SMD (Smart Motor Drivers) driver.
ID argument is the device ID of the created driver.
__init__(self, portname, baudrate=115200)Return: None
This is the initializer for Master class which controls the serial bus.
portname argument is the serial/COM port of the host computer which is connected to the Acrome Smart Motor Drivers via Mastercard.
baudrate argument specifies the baudrate of the serial port. User may change this value to something between 3.053 KBits/s and 12.5 MBits/s. However, it is up to the user to select a value which is supported by the user's host computer.
update_driver_baudrate(self, id: int, br: int):Return: None
This method updates the baudrate of the driver, saves it to EEPROM and resets the driver board. Once the board is up again, the new baudrate is applied.
id argument is the device ID of the connected driver.
br argument is the user entered baudrate value. This value must be between 3.053 KBits/s and 12.5 MBits/s.
get_driver_baudrate(self, id: int):Return: The baudrate of the driver with given ID
This method reads the baudrate of the driver in bps.
id argument is the device ID of the connected driver.
update_master_baudrate(self, br: int):Return: None
This method updates the baudrate of the host computer's serial port and should be called after changing the baudrate of the driver board to sustain connection.
br argument is the user entered baudrate value. This value must be between 3.053 KBits/s and 12.5 MBits/s.
attach(self, driver: Red):Return: None
This method attaches an instance of Red class to the master. If a device ID is not attached to the master beforehand, methods of the master class will not work on the given device ID.
driver argument is an instance of the Red class. Argument must be an instance with a valid device ID.
detach(self, id: int):Return: None
This method removes the driver with the given devic ID from thee master. Any future action to the removed device ID will fail unless it is re-attached.
set_variables(self, id: int, idx_val_pairs=[], ack=False)Return: List of the acknowledged variables or None
This method updates the variables of the driver board with respect to given index/value pairs.
id argument is the device ID of the connected driver.
idx_val_pairs argument is a list, consisting of lists of parameter indexes and their value correspondents.
get_variables(self, id: int, index_list: list)Return: List of the read variables or None
This method reads the variables of the driver board with respect to given index list.
id argument is the device ID of the connected driver.
index_list argument is a list with every element is a parameter index intended to read.
set_variables_sync(self, index: Index, id_val_pairs=[])Return: List of the read variables or None
This method updates a specific variable of the multiple driver boards at once.
index argument is the parameter to be updated.
id_val_pairs argument is a list, consisting of lists of device IDs and the desired parameter value correspondents.
scan(self)Return: List of the connected driver device IDs.
This method scans the serial port, detects and returns the connected drivers.
reboot(self, id: int)Return: None
This method reboots the driver with given ID. Any runtime parameter or configuration which is not saved to EEPROM is lost after a reboot. EEPROM retains itself.
id argument is the device ID of the connected driver.
factory_reset(self, id: int)Return: None
This method clears the EEPROM config of the driver and restores it to factory defaults.
id argument is the device ID of the connected driver.
eeprom_write(self, id: int, ack=False)Return: None
This method clears the EEPROM config of the driver and restores it to factory defaults.
id argument is the device ID of the connected driver.
ping(self, id: int)Return: True or False
This method sends a ping package to the driver and returns True if it receives an acknowledge otherwise False.
id argument is the device ID of the connected driver.
reset_encoder(self, id: int)Return: None
This method resets the encoder counter to zero.
id argument is the device ID of the connected driver.
enter_bootloader(self, id: int)Return: None
This method puts the driver into bootloader. After a call to this function, firmware of the driver can be updated with a valid binary or hex file. To exit the bootloader, unplug - plug the driver from power or press the reset button.
id argument is the device ID of the connected driver.
get_driver_info(self, id: int)Return: Dictionary containing version info
This method reads the hardware and software versions of the driver and returns as a dictionary.
id argument is the device ID of the connected driver.
update_driver_id(self, id: int, id_new: int)Return: None
This method updates the device ID of the driver temporarily. eeprom_write(self, id:int) method must be called to register the new device ID.
id argument is the device ID of the connected driver.
id_new argument is the new intended device ID of the connected driver.
set_user_indicator(self, id: int)Return: None
This method sets the user indicator color on the RGB LED for 5 seconds. The user indicator color is cyan.
id argument is the device ID of the connected driver.
To use SMD modules, you should initially utilize the following scanning function. This function returns which modules are connected to the SMD. Each module has a type and an ID, and through this scanning process, you can learn these properties of the connected modules. When the board is powered up for the first time, this scan is automatically performed once, but afterward, this command should be used manually.
scan_modules(self, id: int):Return: List of connected modules
This method scans and returns the module IDs which are currently connected to a driver.
id argument is the device ID of the connected driver.
get_button(self, id: int, module_id: int):Return: Returns the button state
This method gets the button module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the button. It takes values in the range of 1 - 5 (including 1 and 5).
get_light(self, id: int, module_id: int):Return: Returns the ambient light measurement (in lux)
This method gets the ambient light module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the ambient light. It takes values in the range of 1 - 5 (including 1 and 5).
set_buzzer(self, id: int, module_id: int, note_frequency: int)Return: None
This method enables/disables the buzzer module with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the buzzer. It takes values in the range of 1 - 5 (including 1 and 5).
note_frequency argument specifies the frequency of the tone in Hertz. 0 Hertz will result in no tone.
get_joystick(self, id: int, module_id: int):Return: Returns the joystick module analogs and button data
This method gets the joystick module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the joystick. It takes values in the range of 1 - 5 (including 1 and 5).
from smd.red import*
import time
m = Master("/dev/ttyUSB0")
m.attach(Red(0))
m.scan_modules(0)
# It continuously receives data from the joystick module.
while True:
joystick = m.get_joystick(0, Index.Joystick_1)
joystick_X = joystick[0]
joystick_Y = joystick[1]
joystick_button = joystick[2]
get_distance(self, id: int, module_id: int):Return: Returns the distance from the ultrasonic distance module (in cm)
This method gets the ultrasonic distance module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the ultrasonic distance module. It takes values in the range of 1 - 5 (including 1 and 5).
get_qtr(self, id: int, module_id: int):Return: Returns QTR module data: [Left(bool), Middle(bool), Right(bool)]
This method gets the QTR module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the QTR. It takes values in the range of 1 - 5 (including 1 and 5).
set_servo(self, id: int, module_id: int, val: int):Return: None
This method moves servo module to a desired position.
id argument is the device ID of the driver.
module_id argument is the module ID of the servo. It takes values in the range of 1 - 5 (including 1 and 5)
val argument is the value to write to the servo. It takes values in the range of 0 - 255 (including 0 and 255).
get_potentiometer(self, id: int, module_id: int):Return: Returns the ADC conversion from the potentiometer module
This method gets the potentiometer module data with given index.
id argument is the device ID of the driver.
module_id argument is the module ID of the potentiometer. It takes values in the range of 1 - 5 (including 1 and 5).
The setRGB() method is used to control an RGB Led module by specifying the intensity or color values for each of the RGB components.
set_rgb(self, id: int, module_id: int, red: int, green: int, blue: int):Return: None
This method sets the colour emitted from the RGB module.
id argument is the device ID of the driver.
module_id argument is the module ID of the RGB. It takes values in the range of 1 - 5 (including 1 and 5).
red argument is representing red color's level. It takes values in the range of 0 - 255 (including 0 and 255).
green argument is representing green color's level. It takes values in the range of 0 - 255 (including 0 and 255).
blue argument is representing blue color's level. It takes values in the range of 0 - 255 (including 0 and 255).
The method and colors can be used as in the example below for the RGB module.
from smd.red import*
import time
m = Master("/dev/ttyUSB0")
m.attach(Red(0))
m.scan_modules(0)
m.set_rgb(0, Index.RGB_1, 255, 0, 0) # Red color
time.sleep(0.5)
m.set_rgb(0, Index.RGB_1, 0, 255, 0) # Green color
time.sleep(0.5)
m.set_rgb(0, Index.RGB_1, 0, 0, 255) # Blue color
time.sleep(0.5)
m.set_rgb(0, Index.RGB_1, 128, 0, 128) # Purple color
time.sleep(0.5)
get_imu(self, id: int, module_id: int):Return: Returns roll, pitch angles
This method gets the IMU module data (roll, pitch).
id argument is the device ID of the driver.
module_id argument is the module ID of the IMU. It takes values in the range of 1 - 5 (including 1 and 5).
from smd.red import*
import time
m = Master("/dev/ttyUSB0")
m.attach(Red(0))
m.scan_modules(0)
# It continuously receives data from the IMU module.
while True:
IMU = m.get_imu(0, Index.IMU_1)
roll = IMU[0]
pitch = IMU[1]
FAQs
Python library for interfacing with Acrome Smart Motion Devices (SMD) products.
We found that acrome-smd demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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