sparkfun RFM69HCW Hook-Up Manual page 3

How far will the signal reach? Outside with few obstructions, you should be
able to get a solid link for hundreds of meters. Indoors we've seen it work
for over 50 meters through multiple walls.
The RFM69HCW is capable of transmitting at up to 100 mW and up to 300
kb/s, but you can change both of those values to fit your application. For
example, you can maximize range by increasing the transmit power and
reducing the data rate. Or you can reduce both for short-range wireless
sensor networks that sip battery power.
Board Pinout
The RFM69HCW Breakout Board gives you access to all the pins on the
RFM69HCW, but in the majority of cases you'll only need seven of them.
Here's an overview of the pins we'll be using:
Power
Board Name
Label
3.3V Power
G / Ground
GND
Data
Board Name
Label
O / Master
MISO In Slave
Out
I / Master
MOSI Out
Slave In
C / Serial
SCK ClocK
Function
3.3V power
supply (at
least 130 mA,
see below)
Power ground
Function
Data from
RFM69HCW
to
microcontroller
Data from
microcontroller
to
RFM69HCW
Clock signal
from
microcontroller
to
RFM69HCW
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