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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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    Configuring MCON register for DS5000T

    Hi, I am working with a DS5000T microcontroller. I am able to load intel hex files successfully into it. But when I am running it, nothing is happening. I wrote a program to blink an LED but nothing happens to my LED when I run my program. I suspect the MCON register is not set up properly. It...
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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...

    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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    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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    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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    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...

    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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    Battery capacity in mAH not printed on it :-(

    Hi, I want to use 4 AA sized batteries in my 8052 based project. I calculated the average current for my project which is coming to about 2.48 mA. But unfortunately the AA cells that I have do not have any markings to indicate how many mAH they can provide. If I get the mAH figure I can just...
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    For the benefit of other users...Beware of this supplier...

    https://www.8052.com/forum/read.phtml?id=153354 Check the above post. There is a nasty supplier in Mumbai it seems who sells poor parts. regards, Seemanta
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    Problem with power down mode in 8051

    power down mode 8051 Hi, I have an RTC chip (DS12887) that periodically asserts the IRQ line which is connected to the INT0 line of my AT89S52. I have seen that if my micro is in idle mode, the ISR for INT0 gets called periodically, without any intervention. However, if my micro is in power...
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    Truly DIY MSP430 programmer...need some info

    msp430 programmer diy Hi, I am planning to create a DIY msp430 programmer. Better to put to use the free MSP430F2013IN samples I received of late. :D I have searched this forum and the web, but did not find a truly DIY version. Basically most of them are telling to get an olimex parallel-JTAG...
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    My solution to performing soft reset in 8051, please advise

    Hi, In my system, I need to perform a soft reset for a particular condition from within an interrupt handler. I have multiple interrupt handlers so I have no idea up to how many levels all the interrupt handlers have been nested. However, at all costs, I need to perform the soft reset and...
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    Not able to get hourly alarm in ds12887!! Help!!

    alarm ds12887 Hi, In my digital clock, I want hourly alarm as well as daily alarm. For daily alarm, I set the proper alarm registers properly and it works. It is the hourly alarm that I am not able to get to work. Basically, as per the data sheet, while setting the alarm hour, I am setting the...
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    Turning off daily alarm w/o turning off hourly alarm:ds12887

    Hi, I am making a digital clock using the 8051 micro and the DS12887 RTC chip. I want to know how to turn off the daily alarm. As it happens, there would be *some* value within the alarms registers. That would cause the alarm to go off at that point of time, once a day. Even 0x00 would be valid...
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    IDLE mode in 8051, ISR not getting called!!!

    8051 idle Hi, Based on the advice in my earlier post to create a battery powered AT89S52 based device, I have added some code for IDLE mode into my digital clock. Unfortunately, after the micro goes to idle and it receives an interrupt from the RTC, it does not 'wake up'. So I created a test...
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    Reading and writing to DS 1820...not working...need help...

    Hi, I am using the following routines for reading/writing from/to the DS1820 temperature sensor. I am able to send the reset pulse and also able to get the presence pulse. However, when sending the read scratchpad command, 0BEh, it is not working, because as per the datasheet, I am supposed to...

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