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ADXL345 (2024)
The ADXL345 is a MEMS accelerometer made by Analog Devices. It’s a popular device among hobbyists because of its low cost, easy availability and rich feature set.
But apparently you should be careful about where you buy them: one of my readers ended up with a bunch of ADXL345s that had significant offsets, measurement axes that didn’t work at all, and an inoperative freefall detection mode. Most of the square device in the middle is the proof mass, which is the bit that moves relative to the chip substrate whenever the accelerometer experiences an acceleration. The z-axis sensing function seems to be implemented through two wires entering the chip along the lower edge (one is visible here at the bottom right, while the other one is on the left side).
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