Any ideas on a simple one way communication between two MCUs?

hi, have basic 1 way communication channel between arduino (mega) , bare bones attiny85. need send stuff 1 way (from arduino attiny) , don't need send actual or sophisticated "data", more 4 different signals represent "states". so, long attiny can distinguish between 4 different cases, of arduino sends it, that's totally fine me.

at moment thinking of sending pwm signal (either analogwrite or using servo.write function) arduino , "reading" using pulsein @ attiny side.
the connection should done simple short wire , using kind of serial communication not acceptable.

any other better suggestions or objections?

thanks

quote from: kuruki on may 03, 2015, 07:06 pm

hi, have basic 1 way communication channel between arduino (mega) , bare bones attiny85. need send stuff 1 way (from arduino attiny) , don't need send actual or sophisticated "data", more 4 different signals represent "states". so, long attiny can distinguish between 4 different cases, of arduino sends it, that's totally fine me.

at moment thinking of sending pwm signal (either analogwrite or using servo.write function) arduino , "reading" using pulsein @ attiny side.
the connection should done simple short wire , using kind of serial communication not acceptable.

any other better suggestions or objections?

thanks

why not serial communication? use software serial 1 pin rx , thats all.

also, pwn idea serial communication too.

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