Hi, I must really apologize in advance here, I have very limited knowledge of electronics. I would like some help if possible.
So I have a project I am working on that uses Arduino to measure the relative stance of a user standing on a platform.
I took apart a scale they were selling as an open box item for like $10 and this yielded 4 load cells, or should I say half load cells. They look a lot like the one here: https://www.sparkfun.com/products/10245
. They have 3 wires and not the standard 4.
So, I want to be able to use them to get some input. Accuracy is not as important. I plan on putting one load cell on one side of the platform and one on the other. I just want to be able to detect if the user is leaning forward on it or backward really.
So from what I have gathered:
The "load cell"s I have are actually half wheatstone bridges and I need to complete them somehow. How would I go about doing that?
I am guessing but not sure that their input is about 5v Is there any way to find this out with a multimeter? The scale I got it from was running on 2 3-volt solar panels but I really don't know.
So ok I've got 2 barriers I think.
1) I probably need to complete the wheatstone bridges for these and I don't know what resistors I would need. How would I find this out and how would I set it up?
2) As far as I know there are 2 options for me - I could go with an instrument amplifier chip or I could somehow reduce the analog input reference to 1v. If I did that I would need probably a resistor for this. How would I know how many ohms I would need?
I would be definitely be grateful for any kind of insight into any of this.