![]() ![]() At the end of this function, this analog value is returned. Then the analog value for the servo is calculated by dividing the pulse wide by 1,000,000 to convert the value to us per second and multiplied with the frequency and 4096 for a 12 bit resolution. First the pulse with is calculated between 0 degree and 180 degrees depending on the minimum and maximum pulse width with the map function. h > 2 3 Servo servoMain // Define our Servo 4 5 int 6 trigpin 10 7 8 int echopin 11. Now we create the function pulseWidth to calculate the analog value for the motor depending on the desired angle. Smart Dustbin using Arduino, Ultrasonic Sensor, Servo Motor. 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.Your board should now connect to Adafruit IO. It is a motor that can hold any position between 0 and 180 degrees. write ( 180 - angle) Upload the sketch to your board, and open the Arduino Serial Monitor. Function to specify the angle: pulseWidth(angle) where angle can be between 0 and 180. The servo motor from Parallax is a good standard motor that can be used for this project. ![]() 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. Build the circuit as shown in the diagram using a 10K potentiometer to control the servo motor. 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. 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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