Here's a prototype for a tiny I2C master controller designed to monitor and handle sensor loop and control operations. Conditioned power (+5V) is brought into this board, where it is coupled with the TWI for twelve external devices on three independent clock and data lines. I2C need not be implemented on each bus. Additionally power is combined with three weak-high pins, and three floating for other control applications. Includes an analog comparator (ANC) and a programmable LED.