🔦 QRD1114 Reflective Optical Switch – Phototransistor Sensor

The QRD1114 is a compact, reflective optical switch that integrates an IR LED emitter with a phototransistor for precise, non-contact detection of nearby reflective surfaces. Designed for reliable short-range sensing, it’s ideal for robotics, encoder wheels, and factory automation. This versatile component interfaces easily with Arduino, Raspberry Pi, and other microcontroller-based projects, making it a go-to choice for both electronics engineers and hobbyists.

✨ Key Features

• High sensitivity to reflected infrared light for accurate detection
• Compact design for seamless integration into tight assemblies
• Non-contact detection improves reliability and longevity over mechanical switches
• Wide operating temperature range for robust performance in varied environments
• Low power consumption suitable for battery-powered modules and devices

📐 Technical Specifications

• Operating Voltage: 1.6 V to 5.5 V
• Operating Temperature: -25°C to 85°C
• Collector–Emitter Voltage (Vce): 30 V
• Collector Current (Ic): 50 mA
• Detection Distance: 1.27 mm (typical)
• Sensing Method: Infrared reflection (IR LED + phototransistor)

Note: Drive the IR LED via a current-limiting resistor, and read the phototransistor with a suitable pull-up or bias network. Always observe device ratings for voltage and current.

🔌 Integration with Arduino, Raspberry Pi, and Microcontrollers

• Compatible with 3.3 V and 5 V logic systems common to Arduino, Raspberry Pi, ESP32, and similar platforms
• Connect the phototransistor as an analog sensor (to an ADC) or as a digital sensor using a pull-up resistor or comparator
• Calculate the LED series resistor based on supply voltage and desired forward current to ensure safe operation

🛠️ Possible Applications

• Object detection in robotics projects (Arduino/Raspberry Pi robots)
• Line-following robots and mobile platforms
• Non-contact reflective object sensing for proximity/edge detection
• End-of-line detection in factory automation systems
• Position sensing for shaft encoders and code wheels
• Intrusion and security systems requiring short-range reflective sensing

✅ Why Choose the QRD1114?

• Reliable, non-contact sensing with a proven phototransistor architecture
• Easy to integrate into electronics components and modules
• Ideal for precision short-range detection where space and power are constrained