How to Use Grove Starter Kit Plus - Rotary Angle Sensor

The rotary angle sensor produces analog output between 0 and VCC. The angular range is 300degrees with a linear change in value. The resistance value is 10k ohms, perfect for Arduino use. Thismay also be known as a “Grove Potentiometer”.

Steps

• connect one side of the grove cable into the rotary angle sensor
• connect the other side of the grove cable into A0 of the grove shield
• run the code given below
• open serial monitor (ctrl + shift + m) to view the output

Code

Here the sensor gives an out put ranging from 0 to a max value of 300, it also outputs LOW, MIDDLE or HIGH depending on the value of the sensor

LOW -> 0 - 99 MIDDLE -> 100 - 199 HIGH -> 200 - 300

#define ROTARY_ANGLE_SENSOR A0
#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
int getDegree();
void setup() 
{
 Serial.begin(9600);
   pinMode(ROTARY_ANGLE_SENSOR, INPUT);
}
void loop() 
{
 int degrees;
 degrees = getDegree();
 Serial.print("value  =  ");
 Serial.print(degrees);
 if(( degrees >= 0) && (degrees < 100))
   {
     Serial.println("Range : LOW ");
   }
 else if(( degrees >= 100) && (degrees < 200))  
   {
     Serial.println("Range : MIDDLE ");
   }  
 else
   {
      Serial.println("Range : HIGH ");
   }   
 delay(500); //adjust this for latency control
}
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;
}