Please post a link to the data sheet or product page for the sensor.
Since the individual cells are intended for independent measurements, most likely you would use each individual cell as one leg of a Wheatstone bridge, with three matching resistors in the other legs. Three of those, connected to three amplifiers.
What is your plan for interpreting the data you obtain from that highly specialized part?
For each sensor strip, make a Wheatstone bridge with three (0.1% if possible) low temperature coefficient 120 Ohm metal-film resistors and connect that to the input of an HX-711 amplifier as usual.
The assembly should be isolated from electrical interference with a grounded metal shield.
There are some industrial tutorials about the use of those rosettes, so spend some time on the web.
I suspect that most applications would use two (half bridge) or four (full bridge) copies of that sensor rosette, with three independent amplifiers, making three independent strain measurements of the material under test.
thank you for all the suggestions!
Since I will need to use a total of 5 rosettes (so, 15 strain gauges), the use of the bridges could become a little bit tricky.
Searching on google, I found this amplifier: https://www.aliexpress.com/item/4000907686535.html
It seems that it integrates the bridge since I see some resistors close to the input. Could this be a faster solution?
probably the HX amplifier is better since it is digital, the analog solution would be faster since I would like to test the gauges shortly and I see that the analog solution is faster to implement since it requires few connections.
Is there any difference if the wires from the sensors to the amplifier are 30 or 100 cm long?
And, as others have said, it would be helpful if you described the "big picture" (with photos and sketches), the overall project goal, and what you are going to do with the data. Is this a school assignment?
Yes, but only if the 350 ohm resistance of the resistors match the resistance of your strain gauges. Since your gauge is 120 ohm, you'd need a module with different resistors.
When they hook 4 gauges to a HX711 in a normal application, the geometry of how they are physically positioned on the unit helps constructively amplify and average the signals into one output. One uses the three-axis rosette to get three separate signals of strains in three different axes. In yours, the 45° gauge would help check the results on the other two axes.
