![enter image description here][1] **DESCRIPTION** The Grove - Light sensor module uses GL5528 photoresistor(light dependent resistor) to detect the intensity of light in the environment. The resistance of photoresistor decreases when the intensity of light increases. A dual OpAmp chip LM358 on board produces voltage corresponding to intensity of light(i.e based on resistance value). The output signal from this module will be HIGH in bright light and LOW in the dark. This module can be used to build a light controlled switch i.e switch off lights during day time and switch on lights during night time. **KEY FEATURES** - Grove compatible interface - Plug and play **TECHNICAL SPECIFICATIONS** - Operating Voltage: 3-5V - Supply Current: 0.5-3mA - Photoresistor: GL5528 - Light resistance: 20KΩ - Dark resistance: 1MΩ - Response time: 20-30 secs - Peak Wavelength: 540 nm **DOCUMENTS** Please visit our [wiki][2] page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum. For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=746 [1]: /editor/20160711/5783bc4dec04c.png [2]: http://www.seeedstudio.com/wiki/Grove_-_Light_Sensor