Description: The sensor module is adaptable to ambient light. It has a pair of infrared transmitting and receiving tube. Transmitting tube sends out a certain frequency IR which will be reflected when detecting obstacles (reflecting surface) and received by receiving tube. After processing with comparator circuit, green light is on and signal output interface outputs digital signal (a low voltage level signal). Detection distance can be adjusted with the potentiometer, effective distance range 2~60cm, working voltage 3.3V to 5V. Features: The detection range of the sensor can be adjusted with potentiometer, little interference, easy assembly and use. It can be widely used for robot obstacle avoidance, obstacle avoidance car, assembly line, black and white line tracking and many other occasions. When signal module detects obstacles ahead, the green indicator light on the circuit board is on and at the same time the OUT port outputs low level signal; detection distance can be adjusted with potentiometer, clockwise to increase detection distance;counter-clockwise to reduce detection distance. Active infrared reflection detecting sensor, so the target reflectivity and shape is the key of the detection range.Black color has the minimum detection range, white has the maximum; small objects have short detection range, large objects have long detection range. Sensor module output port OUT can be directly connected to micro-controller IO port, also can drive a 5V relay directly. Comparator uses the LM393 chips, stable performance. Can use 3 to 5V DC power supply.When power on, the red power indicator light is on. Designed with 3mm screw holes for convenient fixation and easy installation; Each module has already adjusted threshold compare voltage with potentiometer well, so please do not arbitrarily adjust potentiometer. Specifications: Working Voltage: 3.3~5V Detecting Range: 2~30cm Detection Angle: 35° Wiring: VCC-VCC; GND-GND; OUT-IO Size: 4*1.5cm/1.5*0.6in Quantity: 5pcs Weight: 3g(approx.) Module Interface: VCC: External connection of 3.3V-5V voltage(can be directly connected to 5V micro-controller and 3.3V micro-controller) GND: External GND OUT: Digital output port(0 and 1) Package Includes: 5 x Modules All the items will be dispatched within one business day by Airmail after the payment is clear. Most times you will receive your order within 10-30 business days after we transfer your package to the delivery company. We cannot guarantee the delivery timeframe if the post office has any unexpected delays due to holiday,weather,customs, or other conditions. Some countries like Russia, Brazil, or some European countries may take up to 50 days or longer for delivery. We appreciate your patience if you haven't received items in 30 days(Russian customers may need more patience by reason of the local delivery system and/or customs). If you are concerned in any way, please feel free to contact us via ebay message instead of leaving negative/neutral feedback or opening a dispute. We will do our best to solve any problem(resend or refund any missingitem). Customs duty is obligation and liability of citizens in yourresponsible for any tax and custom duty incurred. Generally, thedelay or failure delivery is sometimes caused by the policy of different customs. Our listing price includes the value of goods,packaging cost,and export taxes,not including international duties. duties,taxes,and charges are not included in the item price or shipping fee. The duties are buyers' responsibility.Please check with your country's customs office determine what these additional costs will be prior to your purchase. All disputes arising from the duties will be submitted to ebay for solution. Any questions, pls. contact us via ebay message or email us. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. kindly leave us a positive feedback and give us the Detailed Seller Rating with all "5" in very area. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better.We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.