docs: add ASK-OOK repeater example

[mfurga]

Adds an OOK signal repeater example.

[Copilot]

Pull request overview

Adds a new Arduino example demonstrating how to capture and replay (repeat) arbitrary 433 MHz ASK/OOK bursts using the CC1101 library’s asynchronous serial mode, without decoding the protocol.

Changes:

• Introduces a pulse-timing capture buffer and replay routine to retransmit an observed OOK burst.
• Configures CC1101 for ASK/OOK + async serial mode and provides a simple Serial log flow.

Suppressed comments (1)

examples/Repeater/Repeater.ino:73

• The edge-wait loop during capture doesn’t yield while waiting for the next transition (it only checks the GAP_US timeout). Adding yield() here avoids long busy spins when the signal is absent or the line is stuck at a level.

  while (pulseCount < MAX_PULSES) {
    while (digitalRead(GDO0_PIN) == level) {
      if (micros() - edge > GAP_US) {
        return pulseCount >= MIN_PULSES;
      }

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

Suppressed comments (2)

examples/Repeater/Repeater.ino:6

• The header comment describes this as a “Universal” repeater, but the capture logic explicitly requires the burst to start with a HIGH pulse of at least PULSE_MIN_US (and sets firstLevel = HIGH). That constraint should be called out (or the code generalized), otherwise the description is misleading for signals that begin with a LOW segment.

// Universal OOK signal repeater using asynchronous serial mode.
//
// This listens for a 433 MHz OOK burst, records it, and re-transmits an identical
// copy. It works WITHOUT knowing the data rate, bit encoding or framing, because
// it never decodes anything. We simply time the high/low pulse widths on capture

examples/Repeater/Repeater.ino:15

• This example hardcodes the CS pin as 10 in the Radio constructor, whereas all other sketches define a CS_PIN macro and use it in the constructor (e.g. examples/AsyncSerial/Transmit/Transmit.ino). Keeping the same pattern makes it easier to adjust wiring consistently across examples.

#define GDO0_PIN 15

Radio radio(/* cs */ 10, /* gd0 */ GDO0_PIN);