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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...
stepper motor sequence
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...
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 ?
how to use a photodiode
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...
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:
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...
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...
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...
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.
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!
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...
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...
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...
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...
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
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...
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...
Power down mode problem with timer 0 int - solution found!
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...