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Software/Cpp/grove_rotary_angle_sensor.cpp Normal file
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// GrovePi Example for using the Grove Rotary Angle Sensor (Potentiometer) and the Grove LED to create LED sweep
//
// Modules:
// http://www.seeedstudio.com/wiki/Grove_-_Rotary_Angle_Sensor
// http://www.seeedstudio.com/wiki/Grove_-_LED_Socket_Kit
// The GrovePi connects the Raspberry Pi and Grove sensors. You can learn more about GrovePi here: http://www.dexterindustries.com/GrovePi
//
// Have a question about this example? Ask on the forums here: http://forum.dexterindustries.com/c/grovepi
//
/*
## License
The MIT License (MIT)
GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
Copyright (C) 2017 Dexter Industries
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include "grovepi.h"
using namespace GrovePi;
// sudo g++ -Wall grovepi.cpp grove_rotary_angle_sensor.cpp -o grove_rotary_angle_sensor.out -> without grovepicpp package installed
// sudo g++ -Wall -lgrovepicpp grove_rotary_angle_sensor.cpp -o grove_rotary_angle_sensor.out -> with grovepicpp package installed
int main()
{
int potentiometer_pin = 0; // potentiometer is connected to A0 port
int LED_pin = 5; // potentiometer is connected to D5 port
int adc_ref = 5; // reference voltage of ADC is 5V
int grove_ref_vcc = 5; // Grove's reference voltage is 5V, regularly
int full_angle = 300; // max turning angle for the potentiomater (almost a complete turn)
try
{
initGrovePi();
pinMode(potentiometer_pin, INPUT);
pinMode(LED_pin, OUTPUT);
// do this indefinitely
while(true)
{
// start reading potentiometer's values
int sensor_value = analogRead(potentiometer_pin);
// calculate voltage
float voltage = (float)(sensor_value) * adc_ref / 1023;
// calculate rotation in degrees (0 to 300)
float degrees = voltage * full_angle / grove_ref_vcc;
// and calculate brightness for the LED
// basically we map values 0->300 to 0->255
int brightness = int(degrees / full_angle * 255);
float percentage_brightness = 100 * float(brightness) / 255;
// and give a PWM output to the LED
analogWrite(LED_pin, brightness);
// and display status data onto the terminal
printf("[rotar pin %d][led pin %d][sensor value = %d][voltage = %.2f][degrees = %.1f][brightness = %.2f%%]\n",
potentiometer_pin, LED_pin, sensor_value, voltage, degrees, percentage_brightness);
}
}
catch(I2CError &error)
{
printf(error.detail());
return -1;
}
// wait 20 ms for the next reading
// this equates to a rate of 50Hz
// so there are 50 reads / second -> more than enough
delay(20);
return 0;
}