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RF communication use a sample circuit(example in AVR)

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zhonghua_li

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avr rf communication

5_1156941254.gif
 

avr rf

it is better to use ics: TWS433 and RWS433
 

rf communication in avr

but it's low cost in this way
 

avr transmit data am fm

Even including labor? I would think that the real cost of purchasing, stocking, assembly, assembly mistakes, more expensive PCB (more holes, larger), more difficult to tune, etc. would cause it to be much more expensive.
 

fm tuner module avr

zhonghua_li said:
but it's low cost in this way
Click to expand...

Does this circuit work , Anyone tested it !

And what about the MPSH34 transistor , Are there any alternatives to it ! ! !

Thanks ,
 

home made avr rf link

I tested it, it can work within about 5m.
I used 9018 instead of MPSH34.
the main part is the transistor circuit and the OP,
the part of MCU, you can use any other kinds.
only tow transistors and some inductor,capacitor.
of course you must have experience in RF&analog, if not your will cost a lot.

Added after 7 minutes:

you can make a wireless mouse , wireless keyboard, wireless MCU programer or digital audio... in this way.
 

www.ex4.hostiz.com

Thanks (zhonghua_li) , but

1- what about the Darlington , Any suggestion for part no .
2- and what about the 9018 , Any suitable alternatives ?
3- and Why the range is only 5 meters ? can it be extended ?
4- Plz , can u give me explaination for each section in the Schematic , it will be pleasure from u Sir,
Thanks
 

tws433 avr

considering using my fm tx
**broken link removed**
using it i can deliver my data 5km with only 1m dipole antenna :D
i've once build wireless weather station using this transmitter :D:D
 

Last edited by a moderator:

avr rf schematic

yes, i build the fm rx too, but not using TDA7000, just LA3361 if i'm not mistaken :D
and the tuner using a fm tuner module from my local store, it cost about US $3
the reception is very good, since i can receive the smallest station radio i can pick up from my friend FM TX (nearly 20km from me)
i've used this RX for my home made fm transceiver :D:D
i got it on my garage now, but i'm considering to stand the antenna again, and on the air :D:D
 

avr fm data transmiter

you can use any other hi-frequency transistor to instead of MSPH34.
because that the RF signal be blowed up directe & be demodulated.
but it very sample, it cost less $1.
94_1158073780.JPG
 

rf communication avr

Thanks (zhonghua_li) , What about your operating frequency and the coils u used ?

And , Do u really tranmitt data , how u did that , Can u give me more information ,

And , What about the Max. Achieved Data rate
 

tws-433 projects

the information about the coils in the schematic.
the operating frequency about 70 MHZ,
I reall transmit data, and the data be coded by Manchester code, because the received data singal must be a AC signal, if you transmit data frome a USRT direct, the data signal contain some DC.
 

example for avr

Thanks again ((zhonghua_li)) , but i still have some question :-

1- After the Antenna there's a transistor , is it act as a Mixer or an IF amp ?

2- Next there's 2 opAmps (LM358N) , what are those function ?
 

fm modulator with avr

the transistor after the antenna is neither a Mixer nor an IF amp, it is a RF amp. the RF not be mixed and be demodulated direct.
the 2 opAmps be used to turn the small analog signal to digital signal
 

rf communication between avr

zhonghua_li said:
the 2 opAmps be used to turn the small analog signal to digital signal
Click to expand...

How ? I think u used FM Modulation , so how the 2 opamps do their job ?

I'm sorry for my lot questions because in my country there's no RF modules are sold , so the onlw way to make RF link is by discreet components , and i really intend to build your ct but i first have to understand every componet and its function , so i wish you don't angry with my long question
 

rf communication manchester

It 's not FM modulation, but AM modulation. demodulation be implemented by the diode
17_1158248336.JPG
 

avr rf link

zhonghua_li said:
It 's not FM modulation, but AM modulation. demodulation be implemented by the diode
17_1158248336.JPG
Click to expand...

What is the Max data rate you achieved ?
 
Last edited by a moderator:

circuit rf coil digital communication

Hi zhonghua_li

you said you made AM Modulation , Canu PLZ explain how you achieved that in the TX , what happen exactly when u transmit 1 or zero (PLZ explain me the Details

Thanks
 

Re: tws433 avr

Hi

I cant open the page
**broken link removed**

Can you upload correct url please.
 

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