Accel 3 click, carrying ST’s H3LIS331DL, is a high-g accelerometer. While it’s cousin, accel 2 click (with a chip from the same vendor) has dynamically selectable full scales of ±2g/±4g/±6g/±8g/±16g, accel 3 click has ranges of ±100g/±200g/±400g.

Low-g accelerometers excel at detecting fine motion (for device orientation, or analyzing your ping pong bat swings); high-g accelerometers are more at home when tasked with shock detection, impact recognition and concussion detection.

Here’s an exaggerated example: if you used high-g accelerometers to detect screen orientation, you would need to slam your phone against a table or a wall every time you want to switch from portrait to landscape. On the other hand, if you used low-g accelerometers for collision detection, airbags would blow up in your face every time you went over a speed bump. So use each one in an appropriate scenario.

Otherwise, since both chips are from ST, Accel 3 has similar features to Accel 2: both I2C and SPI interfaces are available, selectable by a row of four jumpers. If you use I2C, another jumper will let you choose the I2C address. Additionally – and this is different from accel 2 – here you also have a jumper for choosing which of the chip’s two interrupt lines will be connected to the mikroBUS™ INT pin.

You can se how the example works on the Libstock page, with more detailed explanations on the learn article about MEMS sensors. For data sheets and schematics, go to


Yours sincerely,

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