Grove Light Sensor
The Light sensor module uses the GL5528 photoresistor to detect the light intensity of the environment.
Hello World
Import programSeeed_Grove_Shield_Light_Sensor
Example program for the Seeed Grove shield, that uses Grove Light Sensor by SeeedStudio on A0 pin. This program displays the analog in values.
Last commit 16 Aug 2014 by 
Seeed
Library
Import programSeeed_Grove_Shield_Light_Sensor
Example program for the Seeed Grove shield, that uses Grove Light Sensor by SeeedStudio on A0 pin. This program displays the analog in values.
Last commit 16 Aug 2014 by Seeed
Datasheet
http://garden.seeedstudio.com/images/d/d2/LM358.pdfNotes
The light sensor, also known as the light dependent resistor (LDR). Typically, the resistance of the light sensor will decrease when the ambient light intensity increases.
The change in resistance due to ambient light is not linear; In low-light conditions, small changes in luminance cause relatively large changes in resistance(or output voltage, in this case,) but in well lit conditions, canges in luminance cause only small changes in resistance. More information regarding the response of this type of sensor can be found here: https://developer.mbed.org/users/4180_1/notebook/using-a-photocell-to-determine-light-levels/
Specifications
- Voltage: 3-5V
- Supply Current: 0.5-3mA
- Light resistance: 20KΩ
- Dark resistance: 1MΩ
- Reponse time: 20-30S
- Peak Wavelength: 540nm
- Ambient temperature: -3070 ℃
Resources
- To get buy this shield, please visit http://www.seeedstudio.com/depot/Grove-Light-Sensor-p-746.html?cPath=25_27
- To know more about it, please visit the wiki page http://www.seeedstudio.com/wiki/Grove_-_Light_Sensor
Repository: Seeed_Grove_Shield_Light_Sensor
Night Light
To implement the night light, the sensor output was sent to mbed p20. The threshold can be tweaked to suit a particular lighting condition.
Connecting the light sensor to MBED
Import programNightlight_Seed_Grove_light_sensor
Night light example program utilizing Grove Seed Light Sensor
Last commit 16 Mar 2016 by 
Casey Lively
Graduated Night Light
In this program, the MBED lights up to 4 LEDs based on ambient light levels. Uses the same connections as the Night Light program
Import programGraduated_Nightlight_Seed_light_sensor
Lights up to 4 LEDs based on ambient light levels. Uses Grove Seeed Light Sensor
Last commit 16 Mar 2016 by Casey Lively
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