3 mm IR Transmitter and Receiver Pair

The 3mm IR Transmitter and Receiver Pair gives you one infrared LED (a diode emitting invisible infrared light) and one IR photodiode (a detector that senses infrared) in matched 3mm glass bodies. The ir transmitter and receiver led pair runs on 3V to 5V DC. Glass encapsulation (glass lens instead of plastic) gives tighter optical focus and faster response.

One non-obvious detail — even a 5-degree misalignment between the two halves noticeably reduces signal strength. Keep both on the same axis. The honest limitation is that 3mm bodies produce less output power than 5mm alternatives at the same current. The ir transmitter receiver pair connects to Arduino and ESP32 GPIO pins. Students building line follower robots and arduino projects use it regularly. Wire the transmitter through a 100 ohm resistor to 5V and read the receiver output on an analog pin. StemVolt supplies this pair tested for matched wavelength response.

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Features:

• Operating voltage from 3V to 5V DC suits Arduino, ESP32, and 3.3V board GPIO outputs directly
• Compact 3mm body allows closer LED-to-receiver placement on tight PCB sensor track layouts
• Fast response time suits real-time line detection at robot movement speeds without signal lag
• ir led transmitter receive matched pair wavelength improves detection reliability at short operating range

Technical specifications:

Applications:

• Line follower robot car uses this pair to detect the black line on a white surface below the chassis
• Robotics project uses this pair to count wheel encoder pulses and measure robot travel distance
• 3mm IR Transmitter and Receiver Pair builds a beam break object counter on a small conveyor assembly
• Obstacle detection circuit reads IR reflection level and sends a digital trigger to Arduino GPIO pin

Package includes:

• 1 x 3 mm IR Transmitter and Receiver Pair