Home Sensor Projects Using a BMI160 sensor with an Arduino Uno

Using a BMI160 sensor with an Arduino Uno

by shedboy71

The BMI160 is a small, low power, low noise 16-bit inertial measurement unit designed for use in mobile applications like augmented reality or indoor navigation which require highly accurate, real-time sensor data.

In full operation mode, with both the accelerometer and gyroscope enabled, the current consumption is typically 950 μA, enabling always-on applications in battery driven devices

 

Features

Parameter Technical data
Digital resolution Accelerometer (A): 16 bit
Gyroscope (G): 16bit
Measurement ranges
(programmable)
(A): ± 2 g, ± 4 g, ± 8 g, ± 16 g
(G): ± 125°/s, ± 250°/s, ± 500°/s, ± 1000°/s, ± 2000°/s
Sensitivity (calibrated) (A): ±2g: 16384LSB/g
±4g: 8192LSB/g
±8g: 4096LSB/g
±16g: 2048LSB/g
(G): ±125°/s: 262.4 LSB/°/s
±250°/s: 131.2 LSB/°/s
±500°/s: 65.6 LSB/°/s
±1000°/s: 32.8 LSB/°/s
±2000°/s: 16.4 LSB/°/s
Zero-g offset (typ., over life-time) (A): ±40mg (G): ± 10°/s
Noise density (typ.) (A): 180 μg/√Hz
(G): 0.008 °/s/√Hz
Bandwidths (programmable) 1600 Hz … 25/32 Hz
Digital inputs/outputs SPI, I²C, 4x digital
interrupts
Supply voltage (VDD) 1.71 … 3.6 V
I/0 supply voltage (VDDIO) 1.2 … 3.6 V
Temperature range -40 … +85°C
Current consumption
– full operation
– low-power mode
950 μA
3 μA
FIFO data buffer 1024 byte
LGA package 2.5 × 3.0 × 0.8 mm³
Shock resistance 10,000 g x 200 μs

Typically you would buy a little module which makes it easier to connect up to an arduino, this is the module that was purchased. It does look a little confusing as you can see its marked with 2 different names on the silkscreen and more often than not there is no check in the box called I160 . Just something to look out for.

bmi160 module

bmi160 module

 

Connection

Being an I2C device its easy to connect to an Arduino, watch out though you need to power this off 3.3v, some modules may have a step down regulator but this cannot be guaranteed

 

Arduino Uno pin Module Pin
3v3 3v3
Gnd Gnd
SDA – A4 SDA
SCL – A5 SCL

You can also connect the device in SPI mode

 

Code

This example used the following library which makes life easier – https://github.com/hanyazou/BMI160-Arduino

You can connect the sensor in I2C or SPI modes, you need to change the wiring and the initiliaze device in the code

#include <BMI160Gen.h>
 
const int select_pin = 10;
const int i2c_addr = 0x69;
 
void setup() {
  Serial.begin(9600); // initialize Serial communication
  while (!Serial);    // wait for the serial port to open
 
  // initialize device
  //BMI160.begin(BMI160GenClass::SPI_MODE, select_pin);
  BMI160.begin(BMI160GenClass::I2C_MODE, i2c_addr);
}
 
void loop() {
  int gx, gy, gz;         // raw gyro values
 
  // read raw gyro measurements from device
  BMI160.readGyro(gx, gy, gz);
 
  // display tab-separated gyro x/y/z values
  Serial.print("g:\t");
  Serial.print(gx);
  Serial.print("\t");
  Serial.print(gy);
  Serial.print("\t");
  Serial.print(gz);
  Serial.println();
 
  delay(500);
}

Output

Open the serial monitor and you should readings like the following, move the sensor about to see different values

g: 90 86 9
g: 69 69 40
g: 35 97 -9
g: -7370 3961 -1786
g: -31829 -2652 32767
g: -3221 25109 32767
g: 26020 31878 -26125
g: -20332 -21698 -15712
g: -7297 3463 -1723
g: -1137 1521 420
g: -203 305 96
g: 144 -102 54
g: 77 116 35

 

Links

https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMI160-DS000-07.pdf
CJMCU-160I BMI160 latest inertial measurement sensor attitude module 6DOF

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