Measuring the output of strain gauges

In this video I show you what are the challenges of measuring the tiny changes in the resistance of a strain gauge. The resistance of an unloaded strain gauge is around 350 Ohm (at least the one I use in this video) and a loaded one's is 1-2 Ohms smaller or larger. This is a small change, it is difficult to measure it and it is even more difficult when it is a change in the resistance of something. To make this value into a more comprehensive one, I use a Wheatstone bridge to convert the change in the resistance into a change in voltage. The obtained voltage change is still tiny (few tens of microvolts), therefore I use the built-in PGA (Programmable Gain Amplifier) of an ADS1256 AD converter to resolve this tiny change.

Please don't forget to subscribe!

My website: https://curiousscientist.tech/blog/strain-gauge-ads1256-pga

If you want to buy the parts I used in the video and support me at the same time, you can use the following affiliate links:
STM32F103C8T6 Microcontroller: https://www.banggood.com/custlink/vvDmnhPyHR
ADS1256 Board: https://www.banggood.com/custlink/KKv3bkIZNg
ADS1256 Board with STM32: https://s.click.aliexpress.com/e/_Bf8FBgMr
Strain gauge module: https://s.click.aliexpress.com/e/_dYZ4ToG
LM137T chip (10pcs) https://www.banggood.com/custlink/3DGyrBA4mv
BF350 350 Ohm High-Precision Strain Gauge: https://s.click.aliexpress.com/e/_dYr1oo7
Multimeter: https://www.banggood.com/custlink/vDKGFeuJtt

Видео Measuring the output of strain gauges канала Curious Scientist