IRremoteESP8266

Raw IR Capture and Replay on ESP32 Depends on Timing, Frame Boundaries, and Carrier Frequency

An infrared receiver does not hand an ESP32 a universal “button code.” At the electrical boundary, it produces a sequence of detected carrier bursts and gaps. A raw capture represents those intervals as alternating mark and space durations, usually in microseconds. A capture such as: uint16_t rawData[] = { 3570, 1620, 554, 342, 498, 1244, 496, 378, // ... }; is therefore a waveform description. Replaying it successfully depends on preserving four things together: the timing sequence, the correct frame boundary, the modulation carrier used for marks, and enough optical output from the IR LED.