This Ir transmitter sensor module is directly launched by a single tube; | It requires waveform modulation through the program; | Pin Definitions: (1) Output (2) Vcc (3) GND; | Attention: The white smudge is not corrosion damage, it's flux, can wipe it off with a rag, does not affect the use of the module; | Widely used for infrared communication, infrared remote control, apply to a variety of platforms including 51/AVR/ARM;With signal indicating LED, easy to observe and debug.