Signals timing in IR remote control and cell phones

Re: InfraRed with MCU

Of course it can. Microchip is not the only company that makes protocol handlers for IrDA. Check Texas Instruments and Maxim/Dallas. I'm sure there are others. I am experimenting with IrDA myself. I have the TIR1000 from TI. It is a stand alone IrDA encoder/decoder (protocol handler). I am using a MAX3120 from Maxim/Dallas for the transceiver. Connect transceiver to the protocol handler. Add a PIN photodiode and an IRLED to the transceiver. There are also transceivers that have the photodiode and LED built in. Check Vishay and Avago for those. Connect UART control to the host controller. There are also protocol handlers that have a built in UART. I think Maxim/Dallas has those. I have not built any devices yet, but I eventually want to use IrDA and a PIC18F2550 to interface with my PC's USB port (that'll be fun.) Meanwhile I hope this info helps. Peace.

Re: InfraRed with MCU

IRDA algo chips from various vendors are available which can be interfaced to the micro to get the job done.

Re: InfraRed with MCU

yousafzai said:

IRDA algo chips from various vendors are available which can be interfaced to the micro to get the job done.

Click to expand...

Can you give number of any chip?

Re: InfraRed with MCU

im sure that phones are in the past subsets of such as the normal com port2 ir com's rs232 that computers use as it was used in the past as an interface to many such items
and still is today
i think its now a superset of such a protocol as dictates there bandwidth needs
every byte is a bit to these systems as it controls just one parameter
much like midi and other rs232 superset dsp implementations
there will be literature all about it but in white paper form
you simply sign up to a chip makers white papers / yellow spec sheet
mailing lists just like many chip makers send you regular mail so do phone companies
its best to start locally find a friendly dealer and get to know more senior engineers
this way you'll find out all the subsets of these language fully
most use java core and this is a simple computer on a chip vhdl/fpga chip system
with embedded flashable kernels
books for these things are rare as there life is short term and makers don't expect many people to make such inroads as to develop hardware for interface
so often makers are hard at first then ease off and help you if they understand your keen to develop
such extensions to there com's devices
remember many makers used to also make radio TX units
and it grew from there
and its a very closed shop more these days
with heightened fear about bombers using phones as very complex multiple stage self dialling triggers for such homebrew devices
so are guarded with there info
so it requires fully a level of trust to gain access
best look more indepth at the phone makers sites and ask questions

Re: InfraRed with MCU

Hi everyone,...

I finally got the max3131 which is an IrDA protocol handler. I want now to connect the MCU to the MAX3131 inorder to complete my project.

Attached below the connection diagram. Please, let me know if it's wrong or need a modifications.

Thanks very much guys for your consideration.

Re: InfraRed with MCU

Looks good. I have not seen the data sheet for the MAX3131, but you will also need a transceiver if the MAX3131 doesn't have one built in. Otherwise, you need only a PIN photodiode and an IrLED to complete your project.

Good Luck!

InfraRed with MCU

Computerman29,...
Thanks

Yes, the max3131 do have a transceiver. Thus, I need only the IR_LED and the Photodiode.

Thanks again

So, is this final? I mean is this diagram correct?

Please, feel free to comment as you like.

Thanks for your considerations.

Re: InfraRed with MCU

The MAX3130/MAX3131 combine an IrDA 1.2 compatible
infrared transceiver with an RS-232 interface—all in
a single 3V-powered hybrid microcircuit.

Click to expand...

This was taken from the MAX3131 datasheet.

I do have another question:
When placing the IR_LED and the Photo_diode, Should I isolate them or just place them beside each other?
Also, should I enclose the whole IrDA circuit in a black box?

Thanks very much guys for your consideration.

Re: InfraRed with MCU

used an irda. receiver and compare if you atachment to digital storage scope and captute the signal and compare both the digital frames.

InfraRed with MCU

un-2000,..

Thanks for your reply. But, apparently, I haven't made myself clear. My question is about the IrDA circuit I've made. I'm asking about the allignement of the IR_LED and Photo_diode. I'm asking, should I allign them together beside each other, or place an isolator between them.

Thanks again for your consideration.