AiTinkr GMAC EXT Mini.

The AiTinkr GMAC EXT Mini is a compact PWM and servo expansion module tailored for the AiTinkr GMAC main board. It is designed for robotics and motion-control builds where space, wiring simplicity, and reliable servo control matter more than onboard audio or advanced peripherals.

At its core is a PCA9685 driver providing 16 independent PWM channels, each brought out to a dedicated 3-pin servo header. This makes it easy to plug in standard servos or other PWM-driven loads without custom wiring harnesses, while still keeping the layout neat and accessible.

Three I²C expansion ports allow you to daisy-chain sensors, additional PWM boards, or other I²C peripherals alongside the GMAC ecosystem. Dual power input options—a 2-pin JST battery connector and a 2-pin screw terminal—give you flexibility in how you feed the power rail, and a 2-pin JST DC output lets you power external modules from the same source.

Optimized for the AiTinkr 7.4 V Li-ion battery and intended to keep the stack slim, the GMAC EXT Mini omits I²S audio, amplifiers, and speaker ports entirely. This keeps the board focused on what it does best: precise, stable servo actuation for small robots, animatronic builds, and educational kits that need many channels in a small footprint.