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The flame sensor can be used to detect fire or other wavelength at 760 nm ~ 1100 nm light. The Flame sensor is very sensitive to the flame and can respond to the regular light, it’s generally used for fire alarm purposes.
The PIR Sensor detects motion by measuring changes in the infrared (heat) levels emitted by surrounding objects.
The HMC5883L 3-Axis Compass Magnetometer Module measures magnetic fields in three directions or axes, labeled X, Y, and Z.