For engineers working on precise designs, here are the detailed electrical characteristics (typical at 25°C, VCC = 5V):
Detects entry through doorways or windows when an object breaks the invisible IR path.
The changing voltage from the photodiode is sent to the LM393 voltage comparator IC. The LM393 compares this signal against a reference voltage set by the user via the onboard potentiometer. Fc 51 Ir Sensor Datasheet
Understanding the physical board layout helps optimize the sensor for different environmental conditions. The LM393 Comparator IC
When an object enters the sensor's field of view, the emitted infrared light reflects off the object's surface back toward the sensor. For engineers working on precise designs, here are
: While designed to be stable, extreme ambient light (like direct sunlight) can sometimes interfere with the IR receiver.
Understanding the output logic is crucial for programming. The FC-51 outputs a . By default (most modules), the logic is: Understanding the physical board layout helps optimize the
However, finding a consolidated, detailed datasheet for the FC-51 can be challenging. Many sellers provide only basic pinouts, leaving users to guess at critical specifications like current consumption, detection range, and timing characteristics.
: Use the onboard potentiometer to adjust sensitivity. Turning it clockwise usually increases the detection distance.
The FC-51 is an ideal component for applications that require basic, close-range detection. While it is not the right tool for precise distance measurement, it provides a simple and proven method for detecting the presence or absence of an object.