Discussion in "Project Doubts" started by    Ritesh    Aug 31, 2006.
Thu Aug 31 2006, 07:09 AM
#1
hi,
i am currently desingning a PCB of home automation ove internate
i noticed that the output of 89c51 (i.e. 1 to 8) is directly given ..
but i think there should be pull up resistors bank of 10 k to make stability...while operating relay's with driver transistors..
what u think?
and also..
can we also check the status of the condition ..like ON or OFF status of machine

thanking you
Riteh Jain
Thu Aug 31 2006, 11:51 AM
#2
well if we are connecting the Relays then Driver transistors are required. i have just designed the circuit for cheaper cost using LED just to give idea and every LED denotes a device or switch, and main this to show is switching over internet. so i didnt put much stress on the appliance section.
yes we can check the status also.
i have made a command named "stat" for checking the status.
it will tell u the appliances are on/off and will show u the recent 3 messages sent to the LCD.
Sun Sep 03 2006, 09:29 PM
#3
u can use bc547 transistor there and connect relay or mosfet at output so i hope this will help u

Sun Sep 03 2006, 09:31 PM
#4
values r 560 ohms,47k,4k7,1k.

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