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Posted by adam on January 8, 2006, 10:59 am
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Hi Group,
We are a group of four B.E students studying in M.h.S.S. COE, Mumbai,
India. We writing to you to seek some help and guidance. Since this is
our first microcontroller based project, we are unaware about the
practicalities and methodologies that go into it.
In our project, we have decided to use the following:
AT89C52/AT89S52: MICROCONTROLLER
DS1307: RTC
MAX232/MAX485: LEVEL CONVERTER
AT24C1024: SERIAL EEPROM
4051B: 8:1 ANALOG MUX
IC 741/ LM324: COMPARATOR
LOGIC: 8 channels connected to the MUX, depending on which input is
enables, MUX selects it and sends it to the COMPARATOR. The second
input to comparator is a reference voltage. Comparator's output to port
1.0. Ports 1.1,1.2,1.3 as selects lines to MUX. Ports 1.4,1.5 for
intefacing with memory. Ports 3.0,3.1 as RXD and TXD. Ports 3.2,3.3,3.4
for interfacing with RTC.
Using select lines of MUX , we wish to determine which channel is
enabled.
using RTC we wish to sore the real time and pin number in EEPROM. Using
RS232C we wish to display this data on a PC.
We are facing the following queries:
1. Is our logic correct? Are all the Ic's comaptible?
2. Useful tips from your side.
We are in the stage of preparing the circuit diagram and there are many
doubts which occur. We would like you to suggest software for
preparing schematics and layout. Is there some software available which
directly converts schematic to layout? Please give names.
The next challenge is the software side. In our syllabus we have learnt
C/C++. Since you have mastered this, please guide us how to write the
programs and routines and recommend compliers, simulators and other
software related to programming. Are programs and codes available on
net? If yes, Please give the resource locations or websites.
Any help will be really encouraging and greatly appreicated by us. We
look forward for some positive response.
Last but not the least, we wish you a very happy and prosperous new
year.
Thanking you and with best regards,
Adam Mashraqui.
(on behalf of the group)
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