Now we create the function pulseWidth to calculate the analog value for the motor depending on the desired angle. Therefore we do not need a loop function. To find the optimal value for MAX_PULSE_WIDTH, set the angle to 180īecause we only want to parameterize the servo motor, we need this one iteration from the setup function and have to change the value of MIN_PULSE_WIDTH to get the 0 degree position.To find the optimal value for MIN_PULSE_WIDTH, set the angle to 0.Function to specify the angle: pulseWidth(angle) where angle can be between 0 and 180.The numbers are printed on the board starting with 0 up to 15. On which position of the PCA9685 is the servo connected.In the setup function the PWM object that we created previously is activated with the frequency of 50Hz. Also we control the servo motor with the setPWM function of the pwm object. You find this information on the data sheet of your motor. Nearly all servos use a frequency of 50Hz. In this step you need to tweak the parameters MIN_PULSE_WIDTH and set the parameter MAX_PULSE_WIDTH to a fixed value. To find the right I2C HEX address you can use the I2C HEX code scanner in this article. Then we create an ServoDriver object called pwm with the corresponding I2C HEX address, that is in my case 0x40.
#SMALL SERVO MOTOR ARDUINO HOW TO#
If you do not know how to install a library you find here a tutorial.įirst we include the libraries Wire.h to use the I2C communication and the Adafruit_PWMServoDriver to manage the CA9685 16-Channel Servo Driver board. To control the PCA9685 we use the Adafruit_PWMServoDriver library.
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