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docs: Added a note about different ADLX345 PCB designs 

Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>
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Dmitry Butyugin 2021-03-15 22:50:56 +01:00 committed by KevinOConnor
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commit 8a3a32058f
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docs/Measuring_Resonances.md
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@ -8,6 +8,12 @@ Note that using ADXL345 requires some soldering and crimping. ADXL345 can be
connected to a Raspberry Pi directly, or to an SPI interface of an MCU
board (it needs to be reasonably fast).
When sourcing ADLX345, be aware that there is a variety of different PCB
board designs and different clones of them. Make sure that the board supports
SPI mode (small number of boards appear to be hard-configured for I2C by
pulling SDO to GND), and, if it is going to be connected to a 5V printer MCU,
that it has a voltage regulator and a level shifter.
Installation instructions
===========================