Grove – Rotary Angle Sensor

Grove - Rotary Angle Sensor

The rotary angle sensor produces analog output between 0 and Vcc (5V DC with Seeeduino) on its D1 connector. 

The D2 connector is not used. The angular range is 300 degrees with a linear change in value. 

The resistance value is 10k ohms, perfect for Arduino use. This may also be known as a “potentiometer ”.

Hardware Required

- Intel® Edison for Arduino

- Grove Base Shield v2

- Grove Button(P)

- Grove LED Socket Kit

- Working Voltage - 5V

Circuit

Schematic

Code 

/******************************************************************************/

int potentiometer = 0; 

void setup()

{

  Serial.begin(9600); //set the serial communication frequency at 9600 bits per sec

  pinMode(potentiometer, INPUT);

}

void loop()

{

  int value = analogRead(potentiometer);

  Serial.println(value); //pirnt the value on the serial monitor screen

  delay(1000); //wait 1000ms before printing next value

}

/******************************************************************************/

/*macro definitions of Rotary angle sensor and LED pin*/

#define ROTARY_ANGLE_SENSOR 0

#define LED                 3 //the Grove - LED is connected to D3 of Arduino

#define ADC_REF             5 //reference voltage of ADC is 5v.If the Vcc switch on the seeeduino

                              //board switches to 3V3, the ADC_REF should be 3.3

#define GROVE_VCC           5 //VCC of the grove interface is normally 5v

#define FULL_ANGLE          300 //full value of the rotary angle is 300 degrees

void setup() 

{

Serial.begin(115200);

pinsInit();

}

void loop() 

{

int degrees;

degrees = getDegree();

Serial.println("The angle between the mark and the starting position:");

Serial.println(degrees);

int brightness;

/*The degrees is 0~300, should be converted to be 0~255 to control the*/

/*brightness of LED  */

brightness = map(degrees, 0, FULL_ANGLE, 0, 255); 

controlBrightness(brightness);

delay(500);

}

void pinsInit()

{

pinMode(ROTARY_ANGLE_SENSOR, INPUT);

pinMode(LED,OUTPUT);

}

/*PWM control brightness */

/*If brightness is 0,the LED is off. */

/*The Greater the brightness, the brighter the LED.*/

/*The range of brightness is 0~255 */

void controlBrightness(int brightness)

{

analogWrite(LED,brightness);

}

/************************************************************************/

/*Function: Get the angle between the mark and the starting position */

/*Parameter:-void */

/*Return: -int,the range of degrees is 0~300 */

int getDegree()

{

int sensor_value = analogRead(ROTARY_ANGLE_SENSOR);

float voltage;

voltage = (float)sensor_value*ADC_REF/1023;

float degrees = (voltage*FULL_ANGLE)/GROVE_VCC;

return degrees;

}

See  Also

Reference sites