Frameless Scale

Finished rails (load cell mounts). Two go under the hive, one on each side.

Goals:

• Parts cost under $100 and are readily available.
• Low thermal drift and creep.
• Low power consumption.
• Automatically resumes operation after power failure.
• Can be built by 15 year old student (9th grader) using hand tools.
• No soldering.
• No lethal voltages.

End view with end cap closure strip removed.

Design Features

• No frame: no welding, no bending.
• Load cells are mounted in metal strut readily available from electrical or industrial suppliers in aluminum. galvanized or painted steel.
• Only straight cuts and drilled holes.
• All electrical connections are made with crimp plugs or terminal blocks.

Exploded parts diagram.

Material List

A detailed Parts List with part numbers, suppliers and prices is available in pdf.

Parts Detail

Assembly

Block Diagram

HX711 with screw terminals and metal shield installed connected to Pi