Function: Detects the presence of nearby objects without physical contact.
Common Types:
Applications: Smartphones (screen on/off), robotics, industrial automation, touchless switches.
Output: Digital (HIGH/LOW) or analog voltage, I2C/SPI for smart sensors.
Voltage Range: Typically 3.3V or 5V.
Note: Avoid ambient light interference for IR sensors; consider object material and distance.
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