A prototype for an even tinier 4-amp dual stepper motor controller and driver, providing 500mA per phase for two 4-phase unipolar steppers, or 1A per phase for 1 motor when signals are combined (separate input for motor power). Four-position DIP switches assign a unique device number for addressing within the network, and various motor commands received via the 4-pin interface (+5V, GND, SCL, SDA) are translated and clocked out by the on board microprocessor, completely freeing the controlling device of this tedious task. Quite small -- less than 1.75" x 1.5" including mounting area.

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.