Hello,
Let me start by saying that I have no real experience with electronics, so I might be making some obvious wiring mistakes.
I have two 4-wire (full bridge) load cells, and I would like to use them to build a set of scales. Most examples I have seen online use 3-wire load cells, connecting them in a Wheatstone bridge configuration, but from what I understand it should also be possible to use multiple 4-wire sensors connected in parallel.
I am using a HX711 amplifier and an Arduino MKR WAN 1300, as in the attached schematics. When I try to measure any values, though, the readings I get from the sensors are quite unstable, so that calibrating the device is not really possible. The values do go up when I apply a load, they just oscillate a lot. I have tested the two load cells individually, so I know that they work.
I’m trying to understand how to fix the problem (assuming that it can be done), but I am struggling. I’ve read a post (https://forum.allaboutcircuits.com/...into-wheatstone-bridge-configurations.152354/) where, among other things, they suggested connecting each load cell to a separate HX711 amplifier. However, by doing so I would end up having separate readings for each sensor, if I understand correctly. Is that the only solution?
Please let me know if there’s any relevant information I forgot to add.
Let me start by saying that I have no real experience with electronics, so I might be making some obvious wiring mistakes.
I have two 4-wire (full bridge) load cells, and I would like to use them to build a set of scales. Most examples I have seen online use 3-wire load cells, connecting them in a Wheatstone bridge configuration, but from what I understand it should also be possible to use multiple 4-wire sensors connected in parallel.
I am using a HX711 amplifier and an Arduino MKR WAN 1300, as in the attached schematics. When I try to measure any values, though, the readings I get from the sensors are quite unstable, so that calibrating the device is not really possible. The values do go up when I apply a load, they just oscillate a lot. I have tested the two load cells individually, so I know that they work.
I’m trying to understand how to fix the problem (assuming that it can be done), but I am struggling. I’ve read a post (https://forum.allaboutcircuits.com/...into-wheatstone-bridge-configurations.152354/) where, among other things, they suggested connecting each load cell to a separate HX711 amplifier. However, by doing so I would end up having separate readings for each sensor, if I understand correctly. Is that the only solution?
Please let me know if there’s any relevant information I forgot to add.
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