i\p & o\p same pin

[sahu]

i have requirer i\p & o\p same pin .i\p as logic high\low & o\p is for relay drive ...
it may possible ?

 

[alexan_e]

And how can you detect the input voltage when you provide an output to a relay,
the input should be able to change that output voltage , how can this be done.

The only possible solution would be if with a pin that changes between input and output function (in a fast fast rate) and with loads (maybe relay can work) that will not react to that fast switching and will stay on.

Alex

 

[sahu]

And how can you detect the input voltage when you provide an output to a relay,
the input should be able to change that output voltage , how can this be done.

The only possible solution would be if with a pin that changes between input and output function (in a fast fast rate) and with loads (maybe relay can work) that will not react to that fast switching and will stay on.

Alex

i hope my hardware & software problem ?
sages me

 

[2bengg]

it is not possible to read an input on one pin and then use that same pin to drive a relay.
it is a hardware related thing, how can something give you an output and then also receive an input ?