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DIY robot concept

How to make a robot that sorts objects

A small conveyor sorter with camera classification, servo diverters, bins and a calibration workflow that works before full AI.

Object sorting is a good robotics project because the world is constrained: objects arrive on a belt, lighting can be fixed and bins are known. That makes it much easier than asking a mobile robot to recognize everything in a room.

Start with color or marker-based sorting before training a model. Once the mechanics work, add a camera classifier. The biggest reliability upgrade is not the neural net; it is consistent lighting and an object spacing gate so the camera sees one item at a time.

Core parts

Mini conveyor belt

$55

Moves objects at predictable speed

Raspberry Pi and camera

$85

Captures images and runs simple classification

LED light box

$20

Consistent lighting for reliable vision

Servo diverter gates

$18

Pushes objects into bins

ESP32 or Arduino

$8

Timing for conveyor and servos

Sorting bins

$12

Physical outputs for each class

Design variants

Color sorter

Use HSV thresholds and colored blocks before training models.

Recycling demo

Sort known clean objects like cans, caps and cardboard cards.

Parts counter

Count screws, washers or printed parts into bins using the same conveyor.

Practical safety note

Treat the generated output as a prototype plan, not a certified product. Body-adjacent, high-voltage, optical-energy and mobility builds need qualified review before real-world use.

FAQ

Do I need machine learning?

No. Start with color, shape or fiducial markers. Add ML after the conveyor is reliable.

Why do sorters misclassify?

Bad lighting, overlapping objects and motion blur cause most errors.

How fast should the belt move?

Slow enough for the camera exposure and servo gate. Reliability beats speed in the first version.

Related robot guides

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