They are transceivers and have a burst mode which automates sending a packe=
t
of up to 32 bytes. It will resend the packet a specified number of times
until an acknowledgment is received. Prefix, checksums, and acknowledgment
are handled automatically in burst mode.

You can get a datasheet here:
https://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01P

You can get some real world information that I posted here:
http://www.libstock.com/projects/view/992/nrf24l01-with-pic16f877a-and-no-l=
i
braries

The ones with the eternal antenna have no trouble sending information
several hundred feet through numerous walls.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of
> KPL
> Sent: Saturday, September 27, 2014 4:48 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Experimenting with RF modules
>=20
> These are duplex systems, it seems? What are the real-world specs,
> would they be able to reliably communicate over a distance of about 20
> meters?
> Speed is not an issue.
> I was going to use cheap routers like TP-Link WR703N, but looks like
> they have very poor wifi coverage.
>=20
> On Sat, Sep 27, 2014 at 10:49 PM, Allen Mulvey <allen@amulvey.com> wrote:
> > nRF24L01+ modules at 2.4 GHZ are getting popular. I have been using the=
m
for
> > local telemetry for a number of months. You can get really cheap
rip-offs on
> > eBay to experiment with.  I believe you can use the first 83 channels i=
n
the
> > USA. Logitech uses this band for its wireless keyboards and mice.
> >
> > With rubber antenna:
> > http://www.ebay.com/itm/NRF24L01-PA-LNA-SMA-Antenna-Wireless-
> Transceiver-com
> > munication-module-2-4G-1100m-
> /310651702557?pt=3DLH_DefaultDomain_0&hash=3Ditem48
> > 5448cd1d
> >
> > With PCB antenna:
> > http://www.ebay.com/itm/10PCS-Arduino-NRF24L01-2-4GHz-Wireless-RF-
> Transceive
> > r-Module-New-
> /170819069271?pt=3DLH_DefaultDomain_0&hash=3Ditem27c59c2557
> >
> > Allen
> >
> >> -----Original Message-----
> >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> > Of
> >> meshka7
> >> Sent: Saturday, September 27, 2014 12:50 PM
> >> To: piclist@mit.edu
> >> Subject: [EE] Experimenting with RF modules
> >>
> >> Got two RF modules off ebay. One for 433 MHz and another for 915. My
> >> intention was to experiment with RF and remote control.
> >>
> >> Looking into band allocations in the US, I found that these frequencie=
s
> > fall
> >> into the amateur bands. Wikipedia shows that 433 is for ISM but only
> > within
> >> Region 1, so I guess I'm left only with 915.
> >>
> >> Am I correct here? What bands do people generally use for experimentin=
g
or
> >> making home made gadgets that use RF and that won't be sold
> commercially?
> >>
> >> Thanks!
> >>
> >>
> >>
> >> --
> >> View this message in context:
> > http://microcontrollers.2385.n7.nabble.com/EE-
> >> Experimenting-with-RF-modules-tp192230.html
> >> Sent from the MicroControllers - PIC mailing list archive at
Nabble.com.
> >> --
> >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> >> View/change your membership options at
> >> http://mailman.mit.edu/mailman/listinfo/piclist
> >
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>=20
>=20
>=20
> --
> KPL
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


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