It can't be, any IR receiver photo module will have to use at least 3 pins, two for power supply and one for signal data. May be one pin is broken or may be it's not an IR receiver photo module it's just a photo diode or photo transistor.

If you are using photo diode or photo transistor, then don't do any commutation with that because they will carry noise in their signal and also their signal is very unstable, if you want to eliminate them you need to amplify and filter the signal and do many more things which a single photo module does in very low cost.

Good Luck

just in case im unable to find IR photo module... how can i amplify and filter the signals??

 

To do that properly,you have to first tell us which "PIN photo diode" you are using (download its datasheet) and you will need an oscilloscope ,but its not worth it will cost you more than a cheap photo module.

just in case im unable to find IR photo module

Don't think so,photo modules are available widely because for their application ,mostly used in TV sets.

 

These 916 MHz transmitter modules are available from Digi-Key for around $14.00. They can transmit data or voice.

http://parts.digikey.com/1/parts/637696-transmitter-rf-916mhz-10pin-smd-txm-916-es.html

 

These 916 MHz transmitter modules are available from Digi-Key for around $14.00. They can transmit data or voice.

http://parts.digikey.com/1/parts/637696-transmitter-rf-916mhz-10pin-smd-txm-916-es.html

Nice.... but $14 is like PKR 1200... will find a photo module.... thanx though!!

 

To do that properly,you have to first tell us which "PIN photo diode" you are using (download its datasheet) and you will need an oscilloscope ,but its not worth it will cost you more than a cheap photo module.


Don't think so,photo modules are available widely because for their application ,mostly used in TV sets.

the last part made my life easier!! XD
most usually dont get it wen i say photo module!! :/

 

Hi i am new to rf modulation. i want to transmit data via UART mode of 18f452 from one ic to another. maximum range is 100m. please advise me a curcuit to do so. frequency should be below 80mhz and above 10mhz.

Please dont advice to buy a transmitter module as itx not available in my country, also dont tell me to import because the module would not cost me as much as the importing duty and other stuff might cost me....
do help me... my whole project depends on it!!

also do advise a receiver circuit with it...

Thanks in advance!!

Hi,

For the frequencies that you are citing will require fairly large antennas. For instance, here in the US, Citizen's Band walkie-talkies, 27MHz, typically use 5 mW TX and 1 meter long antenna to transmit/receive 100meter range.

Why not use a cable instead? Simply translate the CMOS UART to RS423 (Maxim chips for this, they may sample a couple if you ask nicely) shove the signals down a CAT-5 ethernet cable (cheap).

For my multi-sensor project I'm using 2.4GHz ISM band (nRF24L01 Nordic chipset) RX/TX board from www.CuteRF.com (China), they ship two boards + reverse SMA antennas for $34USD (PayPal). I'm using these because they employ a 30dBm power-amplifier stage. I'm getting around 900m range in the city.

And shorter range, use these little transceiver gadgets, (free shipping world wide), also Nordic nRF24L01+ 2.4GHz ISM band. They work just fine as a data-pipe (or in chnl hopping mode but mode requires lots of coding and fidling around to get to work)

See eBay: #250859386698 - $7 /pair RX/TX (instant transceivers, just add data + power & couple of screws) with built-in antennas.

Or look up something in the old 1960s QST magazines for some truly home-brew RX/TX low frequency stuff. The frequency bands that you are interested in are already assigned the world over. You don't want to transmit in those bands, else the RF police may track you down. Its best to use a premade commercial module, that way you likely won't be splattering some emergency band or aircraft comm band, etc.

Good luck.

burner_von_tron

 

Hi,

For the frequencies that you are citing will require fairly large antennas. For instance, here in the US, Citizen's Band walkie-talkies, 27MHz, typically use 5 mW TX and 1 meter long antenna to transmit/receive 100meter range.

Why not use a cable instead? Simply translate the CMOS UART to RS423 (Maxim chips for this, they may sample a couple if you ask nicely) shove the signals down a CAT-5 ethernet cable (cheap).

For my multi-sensor project I'm using 2.4GHz ISM band (nRF24L01 Nordic chipset) RX/TX board from www.CuteRF.com (China), they ship two boards + reverse SMA antennas for $34USD (PayPal). I'm using these because they employ a 30dBm power-amplifier stage. I'm getting around 900m range in the city.

And shorter range, use these little transceiver gadgets, (free shipping world wide), also Nordic nRF24L01+ 2.4GHz ISM band. They work just fine as a data-pipe (or in chnl hopping mode but mode requires lots of coding and fidling around to get to work)

See eBay: #250859386698 - $7 /pair RX/TX (instant transceivers, just add data + power & couple of screws) with built-in antennas.

Or look up something in the old 1960s QST magazines for some truly home-brew RX/TX low frequency stuff. The frequency bands that you are interested in are already assigned the world over. You don't want to transmit in those bands, else the RF police may track you down. Its best to use a premade commercial module, that way you likely won't be splattering some emergency band or aircraft comm band, etc.

Good luck.

burner_von_tron

thanx but i live in a country where most of the stuff is not available if it is... itx way above my budget!! $34 might not sound much but it will cost me a lot when converted to PKR, plus the shipping... $7 is a lot too..
for the cat 5e idea, thnx but i want it wireless... hope im not sounding rude... :S
Thanks though...

 

thanx but i live in a country where most of the stuff is not available if it is... itx way above my budget!! $34 might not sound much but it will cost me a lot when converted to PKR, plus the shipping... $7 is a lot too..
for the cat 5e idea, thnx but i want it wireless... hope im not sounding rude... :S
Thanks though...

can anyone please prescribe me a circuit diagram for wireless data transmission from PIC18F452 to PIC16F88? Any band will work as it needs to be transferred in a home.
Uart data rate 9600bps. Thank you.

 

Hi Me again... I am importing 433Mhz transmitters and receivers for this purpose. some how my UART from PIC is not giving any output... any idea about it?

 

btw it cost me USD 30 for importing USD 5 price thing...

 

9600bps
cant i directly do dat...??
433Mhz

 

Hi Me again... I am importing 433Mhz transmitters and receivers for this purpose. some how my UART from PIC is not giving any output... any idea about it?

What model number/manufacturer? If possible post a link to it's datasheet.

Also you should go step by step. If your transmitting PIC isn't giving out any signal on the UART then you should start resolving this issue before even trying to connect it to your transmitter!

 

yes im doing that... i dont have the data sheet and im importing it from china... take a guess... i need to be ready for both cases....

 

is Manchester coding necessary?

 

is Manchester coding necessary?

impossible to know with the amount of information you give us.

 

what should i add to complete the info..

 

PIC 18F452 uC
BAUD 9600
RF modules
> Tx AM Modulation
> Rx ASK/OOK
Freq: 433 MHz