[Mac Cody] has continued working on his original optical mouse hack. In the time since we first posted the story, he has repackaged the mouse’s sensor so that it can be used with any robotic platform. He built a custom board for the sensor and modified a lens package so that the sensor plane doesn’t have to be in contact with the ground. His work is based on a NASA paper Insect-inspired Optical-Flow Navigation Sensors. Mac’s sensor seems to be progressing nicely towards his goal of dead reckoning navigation, but he thinks it could do better if the LED illumination was more focused.