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//
// GrovePi Example for using the Grove Light Sensor and the LED together to turn the LED On and OFF if the background light is greater than a threshold.
// Modules:
// http://www.seeedstudio.com/wiki/Grove_-_Light_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_light_sensor.cpp -o grove_ligh_sensor.out -> without grovepicpp package installed
// sudo g++ -Wall -lgrovepicpp grove_light_sensor.cpp -o grove_ligh_sensor.out -> with grovepicpp package installed
int main()
{
int light_sensor_pin = 0; // analog port A0 for the Grove Light Sensor
int LED_pin = 4; // digital port D4 for the Grove LED
int threshold = 10; // threshold value in kOhm for the Grove Light Sensor
int sensor_value; // variable to hold the Grove Light Sensor value
float resistance; // variable to hold the Grove Light Sensor's resistance value
try
{
// initialize communication with the GrovePi
initGrovePi();
// set the LED & Light pins accordingly
pinMode(light_sensor_pin, INPUT);
pinMode(LED_pin, OUTPUT);
while(true)
{
// start reading the value on the Light Sensor
sensor_value = analogRead(light_sensor_pin);
resistance = (float)(1023 - sensor_value) * 10 / sensor_value;
printf("[led pin %d][light pin %d][sensor value = %d][resistance = %.2f]", LED_pin, light_sensor_pin, sensor_value, resistance);
// check if the resistance gets beyond the threshold
// value in kOhm (check how a light sensor works)
// and turn ON/OFF the LED on the associated pin accordingly
if(resistance > threshold)
{
digitalWrite(LED_pin, HIGH);
printf("[led ON]\n");
}
else
{
digitalWrite(LED_pin, LOW);
printf("[led OFF]\n");
}
// wait 200 ms for the next reading
delay(200);
}
}
catch(I2CError &error)
{
printf(error.detail());
return -1;
}
return 0;
}