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I²C Weight Scale: strain gauges in a Wheatstone bridge amplified in an instrumentation amplifier, A/D converted and made available over I²C in a PIC microcontroller
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PCB/i2c-weight-scale-kicad
PIC12F1822-i2c-weight-scale.X
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README.md

README.md

I²C Weight Scale

I²C Weight Scale: strain gauges in a Wheatstone bridge amplified in an instrumentation amplifier, A/D converted and made available over I²C in a PIC microcontroller.

I²C slave. Reading from the slave responds with a stable digital representation of the load on the strain gauges under a hacked ordinary weight scale.

Open Case

Schematic

The KiCad source files can be found under PCB/. The schematic rendered as a PDF is reached by clicking the PNG below.. The KiCad project depends on my component library which should be checked out alongside this repository.

Schematic

Hacked Weight Scale

Simply buy a cheap kitchen weight scale, remove its PCB and instead take the 4x3=12 leads from the 4 strain gauges to create an external port from a 2.54 mm pin header.

Hacked Weight Scale

The I²C Weight Scale PCB is a module that can connect to any weight scale of 4 strain gauges.

Connection

License

Creative Commons Attribution-ShareAlike 4.0 International

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

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