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Re: Question how to interface 8051 with the 4x4 matrix keypa
it is easy. you can scan row or colum and remember a phenomenon "lap" or "ring" keypad. you need delay about 10ms and scan another one.
Re: master/slave 8051
y can conect up to xxx notes. If you using a repeter( because rs485 permit maximum 32 note.It depend on Rt resistor tranmit line and reflection of signal.)
Re: interfaching rs485
you can use max485 for project. there much noise in transmit line so that you have to reduce it.
Added after 8 minutes:
I'm designing Board RTU using atmega128 and interfaching some slave with another. I have to build protocol for this network and i have some...
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