One body type rain sensor with reflection type sensor for detecting external object

A rain sensor, comprising:

• a light emission unit comprising a first light emission module which is provided to emit light;
• a second light emission module;
• a light receiving unit;
• and
• a control unit, wherein the rain sensor is attached to a vehicle glass and is able to differentiate a raindrop and an external object except the raindrop, which fall down onto the vehicle glass,
• wherein the light receiving unit is configured to receive light which is emitted from the light emission unit and is totally reflected off the vehicle glass, receive light which is emitted from the second light emission module and is reflected off the vehicle glass, and to output a signal with respect to the received light, and the control unit is configured to analyze the signal outputted from the light receiving unit and output a control signal to control a wiper operation, a wiper operation cycle and a wiper operation speed of the vehicle based on the state of the raindrop and the external object.