This is a walkie-talkie project and this circuit really worked, voice can be transmitted from one nRF module to another nRF. Additionally, I want to observe how well the signal strength is, by lighting up an LED.

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They talked about a test.RPD function here in order to do that. But it is said that we can't use this with nRF24L01, but can use only with nRF24L01P (I don't know what is the difference).

Test whether a signal (carrier or otherwise) greater than or equal to -64dBm is present on the channel. Valid only on nRF24L01P (+) hardware. On nRF24L01, use testCarrier(). Useful to check for interference on the current channel and channel hopping strategies. @return true if signal => -64dBm, false if not */

Can't we use it in nRF24L01 really?

If I cannot use this how can I use the testCarrier function to light up an LED (as Bright, Low and Off) as mentioned in the quote?

If I can use this, what changes in the code should be done? (The member TmrhProjects talked about it a little)

He also hints to this code.

bool rpd = radio.testRPD();

while (radio.available()) {
  signalStrength = rpd + 1;
  radio.read, etc...

Should we write the above code in the RF24.h file or should we write it directly into the Arduino's main sketch?

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