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Dog Weigh Scale
Sunday, April 04, 2021
Made a scale to weigh the dog.  Uses load cells and an Arduino Nano to read the cells and show the values on the LCD display.   It is self-taring so that all one has to do is turn it on, wait 3 seconds for it to zero, then (the hard part), convince your dog to sit on it.

I used plastic that I had kicking around but you can use 1/4" plywood if you want.  I support the wood on the 4 load cells using 1/4" aluminum strips.

Hover over photo for description, click for larger.

The four square silver things are the load cells
1/4" aluminum strips support the wood base, contact the load cells
Dimple mates with the top of the load cell
Load cells and "combinator" board for many wires.
Schematic of the arrangement
Made my own "combinator" board.  Chip is pre-amplifier
Bottom of combinator board
Another schematic of the setup
The plastic is from some old signs. Thin wood could be used, but obviously has to be
System is self taring: goes to zero with no weight.