Waveshare Jetbot motor library

jaybdub · September 8, 2020, 8:49pm

Hi rahulsinghrox701,

Thanks for reaching out.

With JetBot we manually specify i2c_bus=1 for the Adafruit_MotorHAT library. See this line

NVIDIA-AI-IOT/jetbot/blob/c78b22fb65ab6896dfd6bb07911293bf70e8a0ac/jetbot/robot.py#L22


      
          
          
# config
          i2c_bus = traitlets.Integer(default_value=1).tag(config=True)
          left_motor_channel = traitlets.Integer(default_value=1).tag(config=True)
          left_motor_alpha = traitlets.Float(default_value=1.0).tag(config=True)
          right_motor_channel = traitlets.Integer(default_value=2).tag(config=True)
          right_motor_alpha = traitlets.Float(default_value=1.0).tag(config=True)
          
          
def __init__(self, *args, **kwargs):
              super(Robot, self).__init__(*args, **kwargs)
              self.motor_driver = Adafruit_MotorHAT(i2c_bus=self.i2c_bus)
              self.left_motor = Motor(self.motor_driver, channel=self.left_motor_channel, alpha=self.left_motor_alpha)
              self.right_motor = Motor(self.motor_driver, channel=self.right_motor_channel, alpha=self.right_motor_alpha)
              
          def set_motors(self, left_speed, right_speed):
              self.left_motor.value = left_speed
              self.right_motor.value = right_speed
              
          def forward(self, speed=1.0, duration=None):
              self.left_motor.value = speed
              self.right_motor.value = speed

I would guess you want to try adding that parameter to the Adfruit example as well

github.com

adafruit/Adafruit-Motor-HAT-Python-Library/blob/master/examples/DCTest.py#L8


      
          #!/usr/bin/python
          from Adafruit_MotorHAT import Adafruit_MotorHAT, Adafruit_DCMotor
          
          
import time
          import atexit
          
          
# create a default object, no changes to I2C address or frequency
          mh = Adafruit_MotorHAT(addr=0x60)
          
          
# recommended for auto-disabling motors on shutdown!
          def turnOffMotors():
              mh.getMotor(1).run(Adafruit_MotorHAT.RELEASE)
              mh.getMotor(2).run(Adafruit_MotorHAT.RELEASE)
              mh.getMotor(3).run(Adafruit_MotorHAT.RELEASE)
              mh.getMotor(4).run(Adafruit_MotorHAT.RELEASE)
          
          
atexit.register(turnOffMotors)

Please let me know if this helps or you run into any issues.

Best,
John