8051 Microcontroller Forum

Remote Controlled Digital Clock with DS1307 & AT89

winzrokz — Tue, 10 Nov 2009 15:17:30 +0530

There are 119 replies, with the last one on 10/11/2009 at 3:17:30 PM by winzrokz
Quote:
In short my question is, since all the 'a' segments of four diplays, 'b'segments etc.. are shorted, how it will be possible to display different numbers on th four units? for e.g. Suppose number two is diplayed on the second FND and we want number 1 on third FND. if the all the 'a' segments are shorted, 'b' segments are shorted...., wont it display segments 'a',b,c,d,e and g in place of 1?

Help with 8051 Music Program

richardv2 — Tue, 10 Nov 2009 08:55:55 +0530

I'm building a project that will play a tune. My rough pseudocode is below.

Main Question: I'm thinking I will store 3 bytes per note in the DB
First byte = note
Second & Third byte = Timer setting for square wave for the selected note. With timer set to 8100H, I get a nice note with a GP transistor driving a small speaker, but I have no idea how far up or down to set the timer for higher/lower notes.

Here is the rough idea:
Pseudocode:

Set data pointer
AGAIN:
until data retrieved = 00H
get next_note from A+DPTR
get note_duration from A+DPTR
move next byte to TL1
inc DPTR
move next byte to TH1

PLAY_NOTE:
SETB TR1 ;start Timer
BACK: (loop here to play the selected note)
JNB TF1, BACK ;while TF1 is zero wait here
CLR TR1 ;stop timer
CPL P2.7 ;complement P2.7 (Output to speaker)
CLR TF1 ;TF1 = 0
SJMP AGAIN

DATA:
DB G, 90h, 80h, G, 90h, 80h, C, a0h, ffh(First few notes of song), 00
(Notes can be characters or integers. Which best?)

END

Temperature controlled Fan (AT89S52)

ansarimoni — Tue, 10 Nov 2009 01:37:14 +0530

There are 251 replies, with the last one on 10/11/2009 at 01:37:14 AM by ansarimoni
Quote:
sir can u plz provide me with the embedded C code for this project.

Hex file for MPC89E52AE program

microcrush — Mon, 09 Nov 2009 22:24:20 +0530

There are 2 replies, with the last one on 09/11/2009 at 10:24:20 PM by microcrush
Quote:

Thank you for the info BINU
I think this allows only 2KB code max.
Can you suggest any more?

Are there any restrictions in SDCC regarding usage of pointers,structures?

I have a small doubt
Did KEIL stopped it's evaluation version?
Because when i download and install it says ur evaluation version has expired.

Can you give link for KEIL+C51 compiler?

I love microcontrollers

ROV CONTROL SYSTEM

Binu — Mon, 09 Nov 2009 19:29:27 +0530

There are 1 replies, with the last one on 09/11/2009 at 7:29:27 PM by Binu
Quote:
You can use AT89S52, do you want to control the speed of the DC motors?
Use L293D for controlling the DC motors with the microcontroller.

[Check out the new 8051 blog]

Smart Access(car security using rfid)

e3comet — Mon, 09 Nov 2009 19:11:53 +0530

Hi...
I need help..
My project is car security using rfid .. m using parallax rfid reader module i need to interface it with 89c51..could anyone help me out with thiz...

doubt about project

nitroracerz — Sun, 08 Nov 2009 14:22:27 +0530

There are 11 replies, with the last one on 08/11/2009 at 2:22:27 PM by nitroracerz
Quote:
same problem with me helpp

Secured data wireless comm Transmitter help needed

nitroracerz — Sun, 08 Nov 2009 14:16:23 +0530

i am worling on project secured data wireless comm.transmitter not working.lcd gives blocks.i had check my hardware many times.read forums.put pullup resistor put its not working still.my idea is code not working properly.but the reciever working fine.
kindly help me its my final year project and i had less than one month to submit it.
if some had tested hex fil of transmitter kindly send it to me
at nitroracerz@hotmail.com
waiting for ur help
regard

Motorola T191 GSM interface with C52

Binu — Sun, 08 Nov 2009 13:38:06 +0530

There are 21 replies, with the last one on 08/11/2009 at 1:38:06 PM by Binu
Quote:
Most of the New Nokia mobiles are using USB connections, so there will be no TX & RX pins. Try with some motorola phones.

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Password Based Door Locking (AT89C2051)

ANIRUDH — Sat, 07 Nov 2009 21:44:13 +0530

There are 251 replies, with the last one on 07/11/2009 at 9:44:13 PM by ANIRUDH
Quote:
sir , plz upload the pcb layout of this project.