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hello guys! Adam here! Today You will be watching CC 1101 packet radio based on
Arduino Uno chip which is ATMEGA328P and I'm going to show
you how to build a very simple packet radio which will operate on
unlicensed band and will base on the Texas Instruments chip CC 1101 so
there's a publicly available library called PANSTAMP which you can use to to
easy program this chip and I will be using a slightly modified version by
Panagiotis Karagiannis so the guy from Greece - he done a very good work to
simplify the code (adopt back to AVR-GCC pure C) to get rid of this Arduino framework from the
code and this is basically a base for my program
The packet radio is it's a device which enable you to
communicate via half-duplex from one terminal - from one PC - to another
PC and from one PC to the smartphone (If you use free FTDI232 driver from Google Play store ) so that will depend all on your creativity
so just for the purpose of this presentation I will be using putty and
two laptops, first laptop the old one with Windows XP and second one with the
Cent OS - this is a different operating system. I have already connected one of my
devices here - maybe short introduction what we have here so
there's a USB to serial port converter (FTDI232 chip based but can be any other)
which is basically used to to install virtual communication port (serial port) in the operating system and then it will
via 3.3 Volt logic communicate with the atmega328 chip
which is basically provisioning the CC 1101 chip operating on 433 megahertz
but it can be any of the supported bands of these chips,
This chip can operate on frequencies like from 315 Megahertz up to 1 gigahertz
it's very flexible it can have it's own (RADIO) address assigned so you can communicate
with many of those devices (at the same time on the same frequency/channel) like I don't know more than 100 it can support up to
four of modulation techniques so I'll be using GMSK and it is intended
to do a low power communication so the maximum transceiver power is only 10mW = 10dbm
to do this presentation I will be using only 1mW
because if the power is higher there would be some problems
on such short range because that would cause some disruptions (overpowered RX link) in a signal
so only 1mW here but in theory this chip when having configured
10mW (transmit power max) - the range can be up to maybe several kilometers in open space
so you will probably have to check this yourself
OK - serial converter - this one is sending data from PC to the chip to the ATMEGA328P to Arduino Uno and this chip will send this data further to the CC 1101
And this guy will receive and transmit the data to the radio to the other device
which is basically the same as here. The other device is connected
here to the WIN XP based laptop and I will be using PUTTY
Okay so let's run the PUTTY (serial terminal) here
I've already prepared some initial config (of PUTTY) - but you have to put correct
information like the virtual port number - the proper one - which is bound to the
FTDI chip (in your Device Manager in Windows). OK this is my first window - the device is connected here
to a USB port. I've programmed this code to blink the LED when
there is something received or transmitted over the radio
and (on the second PC) I'm doing the same so I'm connecting how the FTDI chip to the PC - to the linux based PC
When it is starting up it will blink several times and then it is ready to transmit or
receive. OK so let's make the same here so I will run the PUTTY
I have already provisioned some settings so these are virtual serial ports so we
have ttyUSB0 here and the speed is 9600 bps - the most
commonly used for the terminals like f.ex. Cisco routers.
We have the window. Let's move it somewhere here, now let's see. Just to show you that it
is working I will move this one here...
I do not know if it possible to show two screens at the same time so maybe
I will put something here so like I don't know "hello world". As you can see
it is received here (on second PC) so now we will see. I will be putting
something on the second screen like "how are you" and this guy will answer "I am fine thanks"
as you can see it was received on the
second PC screen - so this is a bidirectional communication over 433MHz frequency
using CC 1101 chip and you have to remember that it is only HALF DUPLEX
so when there's a one person sending something like "Hello" the other
one has to wait. "hi" - as you can see it allows us both way communication on
unlicensed band so if your mobile network goes down you can always
utilize this stuff - these devices to communicate with your friends or do
some other things. It is not encrypted but you have to do it
yourself, you can encrypt this data within the code - it's up to you to
do this and what else I can say. I made some range tests and it works up to
100 meters with 99% of correct packets but maybe if you have
open space the range will be higher (if you have better antenna). like I said this chip -
cc1101 it is intended to provide low-power unlicensed band communications
for some IOT stuff but it can be used for other purposes like I'm showing here
in the packet radio. It is very flexible you can select the frequency,
the frequency can be divided into some some kind of channels or subcarriers and
you can assign an address to the device so the channels will be separated the
devices will have a separated addresses so we can communicate with
particular one (device) and the I think the most important thing is that this board here
it costs only two dollars (on Aliexpress) - 2 USD. You can build a simple
radio device at very low cost and I would recommend this chip to everyone because this
chip is very very powerful. Basically this part is cheaper than my converter
- the serial converter based on FTDI chip. OK so bye-bye
see you next time if you have some ideas what the show please write down
something in the in the remarks I will probably read all of those. As you can
see the packets came from one PC to the another PC. BYE!
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