I am following the instruction from ( https://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo ) to create a transmitter, as circuit made, and tested on Serial Monitor, it works well until i typed "T". It turns out the sending was failed. Why?
*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK
Now sending 278662...failed.
Failed, response timed out.
Now sending 280365...failed.
Failed, response timed out.
Now sending 282066...failed.
Failed, response timed out.
Now sending 283767...failed.
Failed, response timed out.