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September 3, 2009
about 8 years ago
Does anybody know who the manufacturer of this device is?
I have four sensor that appear to be very similar (three wire load sensors) from a bathroom scale. I've wired them as if they were each 1/2 wheatstone bridge (using the red wires as the signal) with Back = VSS, White = VDD (3.3v). This gives me two opposing wheatstones. Each pair of signals (red wires) is read by a differential amplifier and fed into an ADC. They are placed back into the bathroom scale frame and set on the floor. Their differential readings for each pair are:
with 80 lbs placed on the scale they read:
I've had one of the sensors out for inspection and placed it back into the scale, I'm assuming this a major contributor to the descrepencies at zero weight placed. Either way, does this sound like correct placement? If so, why would a scale utilize two wheatstones? Thanks for any insight...
about 12 years ago
This device is at the 532nm wavelength, no need for IR (infrared) filtering which is down beyond the 700nm wavelength.
No public wish lists :(