8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb Creative Commons LicenseThis work is licensed under a Creative Commons Attribution-Noncommercial 2.5 India License.Rickey's World Disclaimer Ajay Bhargav - contact@nospam.com contact@nospam.com Mon, 01 Dec 2008 13:24:16 -0800 Mon, 01 Dec 2008 13:24:16 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html How to make Infrared as an interface to the AT89C51 so that if I send some data to the Infrared sensor, the AT89C51 should process it accordingly.

I don't have any idea how to start. If some one from you guide me through it]]> Fri, 20 Jun 2008 10:19:22 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
you can start by streamlining what your project intends to do, when you say data should be processed accordingly by micro - do to you mean to control some device remotely?

second you have to choose which format you'll be using to decode IR signals - RC5, NEC, Sony etc.

RC5 or philips format is easy to deal with, try to understand how this protocol works, just search on google.

once you are familiar with the subject, then comes the interfacing part to the micro...............



Arun]]> Arun Kumar V<nura1002003@nospam.com> Fri, 20 Jun 2008 18:08:55 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html It isn't clear whether you need infrared data communications or appliance control.
If the latter you need to do as Arun says.
If the former then you must use an Irda protocol.Or better still use Rf for communication instead of IR.]]> sashijoseph<sashijoseph@nospam.com> Fri, 20 Jun 2008 20:07:34 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
I am trying to make a design in such a way where:

1. Mobile phone will send the IR signal.
2. An IR detector connected to microcontroller will get the signal.
3. The microcontroller then process the signal accordingly and control (turn on/off) devices/applicances.

Please not that right now I don't have any idea of RC5 or NEC protocols but if you want me to understand them prior designing the above project then I will definetely study them.

Can you please guide me the way!]]> say2paul<say2paul@nospam.com> Fri, 20 Jun 2008 23:09:44 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html So first of all you need to make your 8051 IRDA ready.
Secondly the communication will be like normal serial communication using AT commands.
The controller will send AT commands to the mobile and the mobile will respond with appropriate messages.
So at first sight this doesn't seem to fit the scheme of things you desire.

Are you sure you need a mobile for it.You can easily do the same thing with another micro or an RC5 remote sending commands to your master micro to control appliances.]]> sashijoseph<sashijoseph@nospam.com> Fri, 20 Jun 2008 23:59:12 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
But I really need a mobile device as I need to develop a logic in mobile device where the mobile device will authenticate the user input and will send some information over SMS and GPRS and then pass some kind of IR signal to the IR detector connected to the 8051 device.

I hope you got some idea what exactly I want to built.]]> say2paul<say2paul@nospam.com> Sat, 21 Jun 2008 00:39:11 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
Is there any particular format for it? Or I can send any date over it?]]> say2paul<say2paul@nospam.com> Mon, 23 Jun 2008 05:22:55 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html ]]> Ajay<contact@nospam.com> Mon, 23 Jun 2008 08:52:45 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Ajay wrote ...

Mobile communication over IR is same like FBUS in some mobiles. you need to send data in packet format. Search in google for more information


Thanks Ajay, but this is a very vague answer. I am googling for past 3 days but unable to find the solution as I do not have expertise in this field.

But you or other electronic experts can help me providing in detail information for IR data transfer from a mobile phone to IR (TSOP) device connected to micrcontroller so that I can control appliances from mobile phone.]]> say2paul<say2paul@nospam.com> Mon, 23 Jun 2008 09:04:37 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html i wrote that in hurry.. i thought you'll be able to find it..

So.. Phone when talks on IR, it works on IRDA protocol, it not just a simple protocol. IRDA has full stack of its own. You have to start yourself with IRDA implementation first before going into mobile communication over IR.

For obvious reasons, its preferred to use wired UART instead.

For IR packet format Please refer to gnokii.org
Packet format is almost same like FBUS with little modifications.

the only problem comes when you have to deal with IRDA protocol. Even the IRDA official website ask for payment to give details about its protocol.

May i know why are you interested in IRDA?]]> Ajay<contact@nospam.com> Tue, 24 Jun 2008 08:00:35 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Ajay wrote ...

Sorry Paul i wrote that in hurry.. i thought you'll be able to find it..

So.. Phone when talks on IR, it works on IRDA protocol, it not just a simple protocol. IRDA has full stack of its own. You have to start yourself with IRDA implementation first before going into mobile communication over IR.

For obvious reasons, its preferred to use wired UART instead.

For IR packet format Please refer to gnokii.org
Packet format is almost same like FBUS with little modifications.

the only problem comes when you have to deal with IRDA protocol. Even the IRDA official website ask for payment to give details about its protocol.

May i know why are you interested in IRDA?


Dear Ajay, Thanks a tonn!

I am not interested in IRDA but moreover interested in developing a bi-directional connection between a mobile phone and microcontroller. I am Symbian C++ developer for last 3 years and I am able to send and receive IRDA data packets through mobile phone (using Symbian C++).

I also want to do this with UART (instead of IRDA) but no one is there to guide so I was trying the other alternate i.e. IRDA.

If you can guide me through UART in detail with some circuit example (if possible).

It will not be difficult for me to develop it provided if someone is there to guide. I know everyone is busy with there profession. But I think it will not take much time for an expert to draw a detailed flow for UART connection with 8051 microcontroller.

The basic aim of the project is: mobile phone (Symbian) will send some signal/data to the microcontroller and the microcontroller will then proccess the data accordingly and control the device/appliances.]]> say2paul<say2paul@nospam.com> Tue, 24 Jun 2008 11:16:38 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
The only alternate left are Bluetooth and IRDA. I did R&D on IRDA and found that it is very difficult and complex to communicate a mobile phone and 8051 using IRDA.

The another possibility in IR is IrSIR. Using IrSIR I think I can send IR signal from mobile phone to the IR remote designed by Ajay.

I do not have any idea about how to communicate using Bluetooth.

It is very uncertain, if anyone from you can suggest me the right path!]]> say2paul<say2paul@nospam.com> Thu, 26 Jun 2008 02:06:46 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Anyone please help!]]> say2paul<say2paul@nospam.com> Thu, 26 Jun 2008 07:25:52 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html

Regarding UART, i tell you, Most of the symbian phones have USB interface and not UART. Thats the problem. If you can scrach the internet maybe you will find some APIs to create a USB based application for symbian but for UART I really doubt

PS: Please give us some small tutorial and tips for what we all need to get start with symbian C++ I am symbian phone user from last 6 years and i am really obsessed with smart phones.. I hope you can understand. I want to learn this symbian C++. Guide me and all of us!
]]> Ajay<contact@nospam.com> Thu, 26 Jun 2008 07:52:26 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Ajay wrote ...

I think symbian provides you APIs to do so.. I dont have any idea about symbian programming, downloaded few tutorial but never read them

Regarding UART, i tell you, Most of the symbian phones have USB interface and not UART. Thats the problem. If you can scrach the internet maybe you will find some APIs to create a USB based application for symbian but for UART I really doubt

PS: Please give us some small tutorial and tips for what we all need to get start with symbian C++ I am symbian phone user from last 6 years and i am really obsessed with smart phones.. I hope you can understand. I want to learn this symbian C++. Guide me and all of us!




Sure Ajay, I love to guide communities. It is not that difficult to learn Symbian C++ but to work on it is not as easy. Anyways I will definitely guide you and the group.

These days I am very much involved into interfacing mobile phone with 8051.

At this point of time I need your help and all other experts in the forum. Please help me to interface the mobile phone to 8051.

-------------------------------

I had a chat with TPS today and he suggest me to build my own protocol for IR instead of using IRDA. I think he is right as IRDA would be difficult to built at a beginner level.

Right now I don't have a strong knowledge of these IR protocols, but I got an idea while driving back home.

The idea is to transmit IR signal (like Remote control transmit the signals to TV) to the IR receiver (TSOP or Phototransistor I don't know the difference) connected to the 8051 (AT89C51) microcontroller.
To acknowledge back, 8051 will send a IR (using IR led coonected to 8051) signal to the mobile phone.

I think this idea will never use the complex implementation of IRDA. All I need is your guidance to begin!

P.S. I don't understand assembly language, please support me in C.]]> say2paul<say2paul@nospam.com> Thu, 26 Jun 2008 09:13:45 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html say2paul<say2paul@nospam.com> Fri, 27 Jun 2008 04:06:55 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Do checkout this uart from Maxim : http://pdfserv.maxim-ic.com/en/ds/MAX3100.pdf

Since there are symbian software for TV remote control,means you could do the same... program the mobile to send RC5 and decode it at the micro with a regular tsop.
Dunno much about Symbian programming but can you somehow switch the mobile's IR led on-off?]]> sashijoseph<sashijoseph@nospam.com> Sat, 28 Jun 2008 05:55:33 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html

I am not know to IrSIR, so i need to read about it before guiding you a little more.]]> Ajay<contact@nospam.com> Sat, 28 Jun 2008 08:20:03 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
Also it is possible to communicate using IrSIR with Symbian but again no idea how will I receive the IrSIR signal from 8051?

Please help me, show me the right path with some circuit diagrams (if possible).]]> say2paul<say2paul@nospam.com> Sat, 28 Jun 2008 10:55:12 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html ]]> say2paul<say2paul@nospam.com> Tue, 01 Jul 2008 02:45:51 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Ajay<contact@nospam.com> Tue, 01 Jul 2008 22:23:42 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
I want to use IrSIR instead of IRDA, I think that will be easy to implement.

The problem with IrSIR is that hoe will I watch the IrSIR at 8051's end? I can modify your IR Switch project where you are controlling 8 relays using an IR remote control.

I want to do something simlar to that i.e. controlling 8 relays from a mobile phone using IR but not from an IR remote control.

Now the problem is that what frequency should I use to send signal to your IR Switch project? Or can I change your code in such a way so that I can add my own set of frequencies in that?]]> say2paul<say2paul@nospam.com> Wed, 02 Jul 2008 02:38:51 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html Since you're not keen on irda,max3100 is out of the picture.

Using SIR would call for bypassing the irda stack in the mobile.You would have to directly use the ir port.Do you know the exact api's which would allow you to do so?
Which mobile and Symbian version are you using?

Supposing you can talk to the IR port,then using SIR you would have to generate a 36-38kHz frequency.This is the fundamental modulation frequency used by most of the TV-remote protocols.
If you are able to generate that frequency then the rest is simple.You can either use your own protocol or else a standard one like RC5.

RC5 uses a series of 14 bits which apart from 2 start bits includes a toggle bit,5 address bits and 6 command bits.You can embed your data in the command and/or address bits.
Further, RC5 uses Manchester encoding in which each bit is composed of 2 half bits.Thus for a 1,the first half bit has to be 0 and the 2nd half bit 1.
For 0 the 1st half bit has to be 1 followed by 0 for the 2nd half bit.

Thus if you have to send a '1' using RC5 protocol,your mobile,for the 1st half bit should output 0 Hz and for the next half bit should output 36kHz.This is the modulation part.Similarly all the 14 bits have to be modulated.At the 8051 the TSOP will demodulate this series of pulses,effectively removing the 36kHz carrier and leaving you with a string of 14 ttl level bits.

So the main thing is generating a frequency.In a normal uart you could do this by sending a series of bytes which would generate the reqd. frequency.
For eg. if the baud rate is 76800 bps (only for demonstration) and the data format is 8N1(8 data bits,1 start,1 stop,no parity) then you could send a series of 0x55 bytes to generate the frequency.......
0x55 = 01010101b .To this is attached a start bit(0) and a stop bit(1).So the output on the line would look like this...
0101010101 (start bit followed by lsb of data byte,the remaining data bits and finally stop bit).
A sequence of 3 bytes would look like this
010101010101010101010101010101

Now each bit is ~13us (1/76,800).Thus the cycle time for the above waveform is 13+13=26us.Thus frequency of the waveform is 1000/26 = 38.46kHz.

I hope you got the idea.You'll have to do sth similar keeping in mind the SIR bps which is 115200 and the data framing format which you'll choose.]]> sashijoseph<sashijoseph@nospam.com> Thu, 03 Jul 2008 01:13:02 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
Thanks a lot sashijoseph, you are a real supporter!

BTW I am using Symbian V7.0 and the target device is N3230. Yes, there are API's that supports the IrSIR communication instead of standard IRDA protocol.

As I do not have any electronics background (I am an IT Pro), its still difficult for me to implement this. But I will definitely try to implement it!]]> say2paul<say2paul@nospam.com> Thu, 03 Jul 2008 03:10:17 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
It will make your project really simple if you will be able to send uart data via IrSIR, because that will reduce not only your programming but also make you do more things faster.

You can directly connect the TSOP's o/p pin to controller's RX and you can use 8051's UART to read data.

to send you need a simple IR circuit's o/p anded with TX pin of 8051's UART.

Make sure that combination of TSOP17XX and frequency should match e.g if you are using TSOP1738 then in your software (phone side) frequency should be 38Khz
similarly for other frequency.

PS: Please give some startup information on symbian programming and SDKs. I want to target on OS9 FP1 ]]> Ajay<contact@nospam.com> Thu, 03 Jul 2008 22:37:26 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html
Is your IR Switch circuit based on UART received by TSOP?

P.S: Following two links will be sufficient for you to start Symbian C++ programming:

http://developer.symbian.com/main/getstarted/
http://www.newlc.com/Getting-started-with-Symbian,134.html

]]> say2paul<say2paul@nospam.com> Fri, 04 Jul 2008 02:01:07 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html

what about sdk and all?]]> Ajay<contact@nospam.com> Mon, 07 Jul 2008 08:15:23 -0700 http://www.8051projects.net/forum-t10181.html Re: AT89C51 Infrared Interface http://www.8051projects.net/forum-t10181.html ]]> say2paul<say2paul@nospam.com> Mon, 07 Jul 2008 08:18:38 -0700 http://www.8051projects.net/forum-t10181.html