The Pololu MinIMU-9 v2 is an inertial measurement unit (IMU) that packs an L3GD20 3-axis gyro and an LSM303DLHC 3-axis accelerometer and 3-axis magnetometer onto a tiny 0.8? × 0.5? board. An I²C interface accesses nine independent rotation, acceleration, and magnetic measurements that can be used to calculate the sensor’s absolute orientation. The MinIMU-9 v2 board includes a voltage regulator and a level-shifting circuit that allows operation from 2.5 to 5.5 V, and the 0.1? pin spacing makes it easy to use with standard solderless breadboards and 0.1? perfboards.
Overview
The Pololu MinIMU-9 v2 is a compact (0.8? × 0.5?) board that combines ST’s L3GD20 3-axis gyroscope and LSM303DLHC 3-axis accelerometer and 3-axis magnetometer to form an inertial measurement unit (IMU); we therefore recommend careful reading of the L3GD20 datasheet (2MB pdf) and the LSM303DLHC datasheet (629k pdf) before using this product. These sensors are great ICs, but their small packages make them difficult for the typical student or hobbyist to use. They also operate at voltages below 3.6 V, which can make interfacing difficult for microcontrollers operating at 5 V. The MinIMU-9 v2 addresses these issues by incorporating additional electronics, including a voltage regulator and a level-shifting circuit, while keeping the overall size as compact as possible. The board ships fully populated with its SMD components, including the L3GD20 and LSM303, as shown in the product picture.
The MinIMU-9 v2 offers several enhancements over our original MinIMU-9. Most noticeably, the MinIMU-9 v2 board is 0.1? smaller on each side, reducing its overall size by 25%! Compared to the LSM303DLH and LSM303DLM used on the earlier MinIMU-9 boards, the LSM303DLHC on the MinIMU-9 v2 features improved magnetic sensing resolution and a wider acceleration measurement range (±2g to ±16g). In addition, the new L3GD20 gyro uses a higher resonant frequency that makes it more resistant to audio noise and vibrations than the older L3G4200D. The MinIMU-9 v2 is pin-compatible with the original MinIMU-9, although changes in I²C addresses and configuration registers mean that code written to interface with a MinIMU-9 will need to be modified to work with a MinIMU-9 v2.
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