Two PIC 16f88 are connected via an i2c bus. Slave is on the left (blinks red LED), master is on the right (blinks yellow). This time, both i2c pull-ups resistors have been removed. Slave won't blink fast once master stops blinking, as expected, because i2c bus is not properly functional.
http://jallib.blogspot.com/2009/01/step-by-step-building-i2c-slave-with_17.html
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