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Nrf24L01-2.4GHz-HowTo
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nRF24L01 2.4GHz Radio/Wireless Transceivers How-To
Having two or more Arduinos be able to communicate with each other wirelessly over a
distance opens lots of possibilities:
Remote sensors for temperature, pressure, alarms, much more
Robot control and monitoring from 50 feet to 2000 feet distances
Remote control and monitoring of nearby or neighborhood buildings
Autonomous vehicles of all kinds
These are a series of 2.4 GHz Radio modules that are all based on the Nordic
Semiconductor nRF24L01+ chip. (Details)  The Nordic nRF24L01+ integrates a
complete 2.4GHz RF transceiver, RF synthesizer, and baseband logic including the
Enhanced ShockBurst™ hardware protocol accelerator supporting a high-speed SPI
interface for the application controller. The low-power short-range (200 feet or
so)Transceiver is available on a board with Arduino interface and built-in Antenna for
less than $3! See it here.
Range??
Range is very dependent on the situation and is much more with clear line of sight
outdoors than indoors with effects of walls and materials. The usual distance quoted
by different suppliers for the low-power version module with the single chip is 200
Feet or 100 Meters. This is for open space between units operating at 250KHz.
Indoors the range will be less due to walls etc...
We suggest you test two units at your actual locations before making a decision. There
are units with an Antenna Preamplifier for the receiver and transmitter power
amplifier and external antenna. The range between that type unit and several low-
power units will be better than between two low-power units. Every situation is a little
different and difficult to get an exact number without actual tests.
Link to nRF24L01+ Data Sheet.  You don't have to, but if you want to understand more
about what you can do with this "little" radio, download the data sheet. In particular
you may want to read pages 7-8-9 ( For Overview and Features), and page 39
(MultiCeiver, which allows 6 Arduinos to talk to a Primary Arduino in an organized
manner). Fortunately the board-level products we have take care of many of the
physical and electrical details and Antenna Impedance Matching etc., and this library
takes care of lots of register initialization and operational details.
There are additional modules which add Transmitter power amplifiers and Receiver
preamplifiers for longer distances.. up to 1 Km (3000 feet). See them all here.  These
modules use an external antenna which can be a simple directly-attached one or a
cable-connected antenna with more gain or directivity. Here's what some of these look
like:

Summary of content (4 pages)

PAGE 1
Wiki Home Recent Changes Pages and Files Members Nrf24L01-2.4GHz-HowTo Edit 0 51 nRF24L01 2.4GHz Radio/Wireless Transceivers How-To Having two or more Arduinos be able to communicate with each other wirelessly over a distance opens lots of possibilities: Remote sensors for temperature, pressure, alarms, much more Robot control and monitoring from 50 feet to 2000 feet distances Remote control and monitoring of nearby or neighborhood buildings Autonomous vehicles of all kinds These are a series of 2.
PAGE 2
like: On the left is the low-power version, with it's built-in zig-zag antenna. On the right you can see the pins sticking down (up in this photo) that connect to Arduino. Later we will show the pinout.
PAGE 3
Above is the version with Transmit Power amplifier and Receive Preamplifier. Our lowcost antenna is on the unit shown on the right. The same 8 pins connect to Arduino and the same software is used. Here's a link to a Home-Brew antenna design: These transcevers use the 2.4 GHz unlicensed band like many WiFi routers, some cordless phones etc. Transceivers like these both send and receive data in 'packets' of several bytes at a time.
PAGE 4
The COLOR is for optional color-coded flat cable such as THIS. We'll add some photos soon showing easiest ways to cable these... NOTE: These units VCC connection must go to 3.3V not 5.0V, although the Arduino itself may run at 5.0V and the signals will be OK. Arduino UNO and earlier versions have a 3.3V output that can run the low-power version of these modules, but the highpower versions must have a separate 3.3V supply. The YourDuinoRobo1 has a higher power 3.