Published May 23, 2014

Using a Potentiometer with SODAQ to measure an angle

You will learn about how an analog wind sensor could collect data, and to display information on the serial monitor of the IDE.

Full instructions provided1,170

Using a Potentiometer with SODAQ to measure an angle

Things used in this project

Hardware components

SODAQ Moja

0.5W Solar Panel

1aH battery pack

Grove Rotary Angle Sensor

Grove w/o Buckle Cable (any length)

Story

0.5W Solar Panel

SODAQ Moja

1aH battery pack

Grove Rotary Angle Sensor

Grove w/o Buckle Cable (any length)

Instructions

First, plug the Rotary Angle Sensor into the A0/A1 pin in the always on row. Next, plug the 0.5W solar panel and the 1A LiPo battery into the respective sockets (see http://www.sodaq.net/#!getting-started/c21ma for a board diagram)

Turn on the SODAQ board, compile and upload the following sketch from the arduino IDE onto the SODAQ Board, and open the Serial Monitor in the IDE.

Code

Download

#define ROTARY_ANGLE_SENSOR A0
#define ADC_REF 3.3 //reference voltage of ADC is 3v3
#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(9600);
 pinsInit();
}
 
void loop()
{
 int degrees; degrees = getDegree();
 Serial.println("The angle between the mark and the starting position:");
 Serial.println(degrees); delay(500);
}
 
void pinsInit()
{
 pinMode(ROTARY_ANGLE_SENSOR, INPUT);
}
 
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;
}

code.c

#define ROTARY_ANGLE_SENSOR A0
#define ADC_REF 3.3 //reference voltage of ADC is 3v3
#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(9600);
 pinsInit();
}
 
void loop()
{
 int degrees; degrees = getDegree();
 Serial.println("The angle between the mark and the starting position:");
 Serial.println(degrees); delay(500);
}
 
void pinsInit()
{
 pinMode(ROTARY_ANGLE_SENSOR, INPUT);
}
 
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;
}

Credits

Ollie Smeenk

8 projects • 6 followers

Business-oriented Tinkerer! Ready to engage in any project for- and not for profit!

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Using a Potentiometer with SODAQ to measure an angle

Using a Potentiometer with SODAQ to measure an angle

Things used in this project

Hardware components

Story

Instructions

Code

Code

Code

code.c

Credits

Ollie Smeenk

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