Hey all,
Great forum...
I have a Mp3 player that has a 5v rs232 control port
It comes with 1 controller, i want to make my own
i got the protocol, and i wrote code for a atmel AVR
that part all works, i want to interface it to the mp3 player
the company told me, no problem, just wire the output of the
uart in the AVR Open Collector to the mp3 players TX wire
ok, i think i understand it... but can some one show me the
drawing of the transistors
I know i need two transisors, 1 will invert the uarts TX, then the second one will invert it back and provide open collector output
also HIGH is the idle state of the line, so do i need to pull it high?
in that case thats not exactly open collector is it?
i need a Wired "or" solution
thanks!
mitch
Great forum...
I have a Mp3 player that has a 5v rs232 control port
It comes with 1 controller, i want to make my own
i got the protocol, and i wrote code for a atmel AVR
that part all works, i want to interface it to the mp3 player
the company told me, no problem, just wire the output of the
uart in the AVR Open Collector to the mp3 players TX wire
ok, i think i understand it... but can some one show me the
drawing of the transistors
I know i need two transisors, 1 will invert the uarts TX, then the second one will invert it back and provide open collector output
also HIGH is the idle state of the line, so do i need to pull it high?
in that case thats not exactly open collector is it?
i need a Wired "or" solution
thanks!
mitch