CNY70 Reflective IR Optical Sensor with Phototransistor
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Prices updated: 12 Oct 2026
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About this product
Reflective optical sensor that combines an infrared emitter and a phototransistor in one package, with transistor output. It detects the presence or reflectivity of nearby surfaces and is used in line-following robots, object detection and simple position sensing.
Specifications
- Sensor type
- Reflective optical sensor
- Emitter
- Infrared LED (approx. 950 nm)
- Detector
- Phototransistor
- Output
- Transistor output
- Package
- 4-pin
Frequently asked questions
How do I wire the CNY70 sensor?
Connect the IR emitter to the supply through a series resistor to limit current. For the phototransistor, connect the emitter to ground and the collector to the supply through a pull-up resistor, then read the collector voltage.
Can the CNY70 output be read by an Arduino?
Yes. The collector voltage can be read on a digital or analog input. Choose the pull-up and emitter resistor values to suit your supply voltage and the logic level of your board.
