@SgtRic "Yah, that;s a thought... I wonder what his take on this is?"
My take is for altitude relative to the starting ground altitude, all I care about is resolution and precision, not absolute accuracy. If the sensor is 1kPa off from reality, I don't care. I only care about repeatability (precision)
It's a Wheatstone bridge, but a simple 5v single supply opamp will manage.
It has an open back, meaning you can see the die and binding wires, so you want to take some care. I've used them. I can't speak for linearity, but I can say they are more sensitive than the ported Freescale models above. Note the port is tricky to fix a tube on. I superglued a small aluminum tube which hasn't broke yet (blow baking soda from a straw into the wet super glue joint as a filler/fixer)
As for a smaller package differential. I have some at $1 price point. It needs a differential Op amp with about 30x gain, because it's a raw mems bridge.
I saw the "accuracy" spec as well. But it also says intended for use as barometer and weather stations whic would imply a good deal more resolution than 1kPa. So I propose the absolute accuracy is rated to 1kPa, while the resolution one hopes may be more - pray its noisy, so you can at least dither.
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My take is for altitude relative to the starting ground altitude, all I care about is resolution and precision, not absolute accuracy. If the sensor is 1kPa off from reality, I don't care. I only care about repeatability (precision)
$1.49It's a Wheatstone bridge, but a simple 5v single supply opamp will manage.
It has an open back, meaning you can see the die and binding wires, so you want to take some care. I've used them. I can't speak for linearity, but I can say they are more sensitive than the ported Freescale models above. Note the port is tricky to fix a tube on. I superglued a small aluminum tube which hasn't broke yet (blow baking soda from a straw into the wet super glue joint as a filler/fixer)
I have some breakout boards coming, maybe then I can do some side by side tests.
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