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Objective:
To learn to use analog Write/PWM to adjust the speed of motors
PinOuts of the MicroBit
If the enable pins are jumpered out or connected to +3V, the motors run at maximum speed
If the enable pins are jumpered out or connected to +3V, the motors run at maximum speed
To adjust the speed we can use a PWM(Pulse Width Modulation) signal using the analogWrite command to vary the amount of power to the motor,
To adjust the speed we can use a PWM(Pulse Width Modulation) signal using the analogWrite command to vary the amount of power to the motor,
from 0 to 1023
from 0 to 1023
Connect ENABLE A to Pin 0
Connect ENABLE A to Pin 0
Connect ENABLE B to Pin 1
Connect ENABLE B to Pin 1
What happens when A is pressed? When B is pressed?
What happens when A is pressed? When B is pressed?
Below: Demo code- speed ramps up from 0 to maximum
Below: Demo code- speed ramps up from 0 to maximum
Example 2: Using Sound Sensor
Example 2: Using Sound Sensor
Full Speed is 1023 (Analog Write)
Full Speed is 1023 (Analog Write)
Full Volume is 255(Analog Read)
Full Volume is 255(Analog Read)
So use Math Block to multiply sound level by 4
So use Math Block to multiply sound level by 4
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