hello every body , I want to create a Star or Mesh network with arduino like image below :
the distance node between master is about 2 km.
I want to create full duplex communication , send sensor information from nodes to master node , that master node reply to each one.
witch kind of RF module is best for my solution ?
my RF module must be UART or USART , Cause of I cant use SPI Protocol , because I use SD card that use SPI Protocol.
the distance node between master is about 2 km.
I want to create full duplex communication , send sensor information from nodes to master node , that master node reply to each one.
witch kind of RF module is best for my solution ?
my RF module must be UART or USART , Cause of I cant use SPI Protocol , because I use SD card that use SPI Protocol.
![2mplcpf.jpg](/forums/proxy.php?image=http%3A%2F%2Fi67.tinypic.com%2F2mplcpf.jpg&hash=2a3b1ca639196b9fd99a23e775e0f00b)