SunFounder Flame Sensor Module for Arduino and Raspberry Pi A flame sensor module that consists of a flame sensor, resistor, capacitor, potentiometer, and comparator LM393 in an integrated circuit. Sensitive to flame, also responsive to general light; generally used for flame Detect flame or light of a wavelength ranging from 760 to 1100 nm. Output clean signals by a comparator, with good waveform and driving capability as strong as more than 15mA Working voltage: 3.3V - 5V; PCB size: 2.3 x 2.3 cm. For more info, please refer to http://wiki.sunfounder.cc/index.php?title=Flame_sensor_Module