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    Need very fundamental info about TSOP17XX IR decoder

    Hi, I have very basic and fundamental question about the TSOP infra red decoder. My question is, what demodulation technique does it use? Is it ON-OFF keying? As I understand a TSOP1738 decoder would demodulate a 38 Khz carrier. But how does it expect the carrier to be modulated? Does...
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    Problem with stepper motor: is my stepping sequence correct?

    stepper motor sequence Hi, I have a stepper motor which was lying idle until I decided to make some use of it. I just want to first test it by making it turn for a full 360 degrees. It has 5 wires: one is common and 4 are coil inputs. I have hooked it up with my AT89S52 and a ULN 2803 as per...
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    How to use IR detecting photodiodes...

    ir photodiode circuit That's the problem! I do not have any matched TX/RX set. Just an IR LED and a photodiode. I shall do a bit more research on the data stream approach, but in the meantime can you provide some pointers on how to use a plain photodiode to detect IR ? regards, Seemanta
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    How to use IR detecting photodiodes...

    how to use a photodiode Hi, A few days ago, I got my self a an IR led and an IR 'sensor'. The IR led looks just like a normal transparent red LED but it is supposed to radiate IR. The sensor on the other hand looks very peculiar and is completely black in color and covered. I am not so sure...
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    Need help in interfacing a 74HC595 s-in/p-out shift register

    Hi, Has anyone interfaced a 74HC595 with AT89S52 or similar microcontroller? If yes, any pointers would be helpful. regards, Seemanta
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    GUI version of ProloadV5.4 for Linux...

    Hello all, I am now happy to present the GUI version of the ProloadV5.4 software that many of us use to program AT89S52 board from Sunrom Technologies. This has been written using the GTK+ tool kit and will run on Linux. It is now available at: https://sourceforge.net/projects/gnuproload...
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    Anyone uses Proload from Sunrom tech for AT89S52 here?

    www.sun rom.com Hi, Then would you like to try out my new gnuProload? I have ported the windows based Proload to linux. A command line version is already ready and right now the GUI version(using GTK+) is also almost done. Do pm me if you are interested and I shall send you the source code...
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    Question regarding DS1820

    I remember once, that I was erroneously referring to some DS1820 variant data sheet and the formula for getting temperature was very different. I thought to myself, "Whoa! Wait a minute, this can't be the data sheet I was looking at earlier." Sure enough, I realized it was not DS18B20, the IC I...
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    Which ROM IC to use for interfacing with AT89S52?

    ic at89s52 Hi, I have never used an AT89S52 with external 64K code memory. Can you please suggest which IC would be the best one? I only need external code memory as the internal RAM would be sufficient for my purpose. The only criteria I am looking for is ease of programming the ROM chip. I...
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    Question regarding DS1820

    Can you please tell me what is the exact specification of your IC? Is it DS18B20, or DS18S20 ? I used a DS18B20 with my AT89S52 and the decimal conversion worked without any problem. I can point you to the code if you want. regards, Seemanta
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    Anyone uses Proload from Sunrom tech for AT89S52 here?

    proload sunrom Can anyone please let me know if they are using the sunrom AT89S52 rapid development board from Sunrom technologies (www.sunrom.com) ? Are you using Proload to program your dev board? Thanks in advance! regards, Seemanta
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    Ideas for final year project with PIC16F877A and LCD

    Re: degree project Fully agree with you. Even in my final year myself and my partner made a traffic controller that would be real time in nature. In the sense that it would change the duration of its signaling lights in accordance with the traffic flow. And as you said, for us also it did not...
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    AT89S52 based digital clock/thermometer...

    free dital clock with day and dates by at89s52 Done! Attached as a zip file! Thanks again! ~seemanta
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    Ideas for final year project with PIC16F877A and LCD

    Re: degree project That's the same thing I built. A clock that shows the temperature as well. And yes, it had an alarm too :D. Actually it had both, daily and hourly alarm. Although, I won't mind anyone 'copying' my project, but would seriously advise you to get 'inspired'. Inspiration was...
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    AT89S52 based digital clock/thermometer...

    digital clock using at89s52 Frankly speaking, the honor is mine ;-) On a different note, I had a question. I was not able to upload my code to the forum. Even when I changed the extension of the file to jpg, it is not showing up in my post. The code is huge, about 1500 lines of assembly, so...
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    Need some opinions on temperature sensor

    ds1820 vs lm35 Even my experience with DS1820 has been generally good. Never tried any analog sensor though. The advantage is clearly in terms of MCU pins. With DS1820, all you need is one pin. You might even do away with the power supply in case you decide to use it with parasitic power...
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    AT89S52 based digital clock/thermometer...

    at89s52 clock Hi all edaboard'ians, Here I present to you my AT89S52 based digital clock/thermometer. I made this as a b'day gift for my sister who was no doubt, very excited to have this cool handmade gadget as a gift! I made it quite some time back but was not able to upload it because...
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    low power LCD for hobby projects?

    Hi, I have used the Hitachi 44870 based LCDs for some time now. However I wanted to know if there are other low powered alternatives too. 44780 is a dot matrix LCD and I was looking for something like 7 segment LCDs which I guess would consume much lesser power. Something like which is found on...
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    Power down mode problem with timer 0 interrupt...

    Yes, Rajeshkumar123, That idea also came to my mind. However, with that some extra code would always run in my ISR and I wanted to avoid that and keep my ISR as small and fast as possible. I thought I would simply start the timer and forget about it until the interrupt for 10 seconds comes in...
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    Power down mode problem with timer 0 interrupt...

    Power down mode problem with timer 0 int - solution found! Hi, I have observed that after going to sleep and waking up, my timer 0 interrupt handler does not get called. My problem is this: My micro receives an external interrupt every second from a real time clock. This external interrupt...

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