hi, I have a visual studio program that controls (8- relays module) through an arduino program and Its perfectly working but I need to transfer that signal of (relays on-off) using a master arduino board to (another slave arduino board connected to the relays)
any help to start!
Have a look at this Simple nRF24L01+ Tutorial.
Wireless problems can be very difficult to debug so get the wireless part working on its own before you start adding any other features.
The examples are as simple as I could make them and they have worked for other Forum members. If you get stuck it will be easier to help with code that I am familiar with. Start by getting the first example to work
There is also a connection test program to check that the Arduino can talk to the nRF24 it is connected to.
A common problem with nRF24 modules is insufficient 3.3v current from the Arduino 3.3v pin. The high-power nRF24s (with the external antenna) will definitely need an external power supply. At least for testing try powering the nRF24 with a pair of AA alkaline cells (3v) with the battery GND connected to the Arduino GND.
If you are using the high-power nRF24s (with the external antenna) make sure there is sufficient distance between the two nRF24 so that the signal does not overwhelm the receiver - try 3 metres separation. If you are new to nRF24s it may be better to start with a pair of low power modules with the pcb antenna.
...R