I just pulled two of these strain gauges from a bathroom scale, which look like this:
So I used two of these to make a full bridge circuit using this wiring setup and connect it to HX711:
When i press one of the strain gauges, its shows me a positive increase in the load. But the major problem is I have to press the thing very hard to show me a change.
I want to measure very small stuff like in terms of grams. How do I increase the sensitivity of the sensor? Should I make a change in the software or any mistake in my hardware.
Thank you in advance
What led you to believe the gauges would read differently now than when they were in the bathroom scale? You can use a lever to multiply the force on the gauge.
No. I actually wanted a small load sensor instead of the large 4 gauge setup to measure items in a bottle or a small jar.
So I wanted to place the items over the strain gauge and measure items.
Essentially I just wanted a small single point load sensor setup to weigh items.
That is why I pulled them out from the bathroom scale.
I want to measure very small stuff like in terms of grams.
Then you should use a load cell from a scale that is designed to weigh "very small stuff like in terms of grams." Such as one of these:http://www.awscales.com/portable-precision-scales-01-gram/229-amw-100-digital-pocket-scale
The load cells in diagram#2 are connected wrong.
E+ and E- from ONE cell has to be swapped.
So one outputs a positive going voltage, and the other one outputs a negative going voltage.
I just pulled two of these strain gauges from a bathroom scale
I want to measure very small stuff like in terms of grams. How do I increase the sensitivity of the sensor?
You are asking to do eye surgery with a bulldozer.
You can’t. You need the sensor from a small kitchen scale, not a bathroom scale.
Thanks for the replies guys! As pointed out, I was using a load cell with excess capacity to weigh smaller items.
I will also try out the lever setup.