My background is in programming so am something of a newbie when it comes to analogue devices. I have taken apart a cheap set of digital bathroom scales and removed the sensors from each of the foot cups. I'm fairly sure it's a type of strain guage but I could be wrong. All I need to know is how to hook it up my Arduino board so I can get a reading on the force being applied. I've found a number of circuit diagrams for strain guages but they all have 4 wires coming out the strain guage where as mine only has 3: 1 red (presuably V+), 1 blue (presumably ground) and 1 white (presumably signal out). I suspect there should be an op-amp involved somewhere and I have a bunch of LM324n's lying around (as you do) but I'm pretty much flying blind. Any guidance would be appreciated.
The sensor looks like this