This IR LED/phototransistor pair is great for precisely identifying changes in reflectance. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 80 mm.

Empower your Romi robot to manipulate its surroundings with this robotic arm accessory kit! The kit contains everything you need to build the arm, including a micro gripper and three servos—one for controlling the height of the arm, one for controlling the tilt of the gripper, and one for actuating the gripper paddles themselves.

This compact (0.4″ × 0.5″) switching step-down (or buck) voltage regulator takes input voltages up to 50 V and efficiently reduces them to 7.5 V while allowing for a maximum output current of 600 mA. It has a very low dropout, so it can be used with input voltages that are within a few hundred millivolts of its output.

This compact (0.4″ × 0.5″) switching step-down (or buck) voltage regulator takes input voltages up to 50 V and efficiently reduces them to 15 V while allowing for a maximum output current of 600 mA. It has a very low dropout, so it can be used with input voltages that are within a few hundred millivolts of its output.

This compact (0.4″ × 0.5″) switching step-down (or buck) voltage regulator takes input voltages between 4 V and 50 V and efficiently reduces them to a lower, user-adjustable voltage set by an on-board trimmer potentiometer. It has an output voltage range of 2.5 V to 7.5 V and a maximum output current of 600 mA.