The KY 026 module is a device made for the Arduino or any MCU to detect any sign of flame or fire in the surroundings where the sensor is installed.
The KY-026 Flame Sensor Module is a sensor for flame wavelengths between 760 nm to 1100 nm infrared is most sensitive 60-degree detection sensor
Two outputs mode: AO: analog output- real-time output voltage signal on the thermal resistance; DO: when the temperature reaches a certain threshold- the output high and low signal threshold adjustable via potentiometer