Speed of Transmission

[donaldhwong]

Does anyone know from sending one byte to reception and recognize the byte, from one to another RFM69(433MHz), the actual delay in micro seconds？

Is there a way to test it?

Thank you,
Donald

[Felix]

It takes several ms to fully transmit a packet. Each packet has several header bytes and of course the payload. You can do a rough measurement using millis() in your code, or you can hookup to a logic analyzer to watch the SPI transmission and D2 interrup trigger - that gives you a precise delay of how long it takes to modulate the packet bytes into the medium.

[donaldhwong]

Very helpful.  Thank you, Felix.

[donaldhwong]

For those who is interested to know the actual delay from sending one byte from one RFM69 to anther, then receive a reply of one byte back is 820~835 microseconds.