https://www.mdpi.com/1424-8220/12/5/6685/htm
This is one of a (the) best papers I've seen.
Typically, strain gauges are made from constantan (micro wires), the resistivity changes are typically in micro ohms.
Using graphite, amorphous carbon, makes so much difference it makes that variation ohms instead of micro ohms. And the materials are exceedingly accessible / easy to obtain, A4 paper and 2B pencils, then maybe copper foils etc, and it can be used to make sensitive weighing balances e.g. with 3d printed or even hand made sensors etc.
With this one could even get away without amplification and use things like a simple microcontroller to measure weights.
This is one of a (the) best papers I've seen.
Typically, strain gauges are made from constantan (micro wires), the resistivity changes are typically in micro ohms.
Using graphite, amorphous carbon, makes so much difference it makes that variation ohms instead of micro ohms. And the materials are exceedingly accessible / easy to obtain, A4 paper and 2B pencils, then maybe copper foils etc, and it can be used to make sensitive weighing balances e.g. with 3d printed or even hand made sensors etc.
With this one could even get away without amplification and use things like a simple microcontroller to measure weights.