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      Grove - 3 Axis Digital Accelerometer±16g Ultra-low Power (BMA400) The Grove - 3-Axis Digital Accelerometer ±16g Ultra-low Power (BMA400) sensor is a 12 bit, digital, triaxial acceleration sensor with smart on-chip motion and positiontriggered interrupt features. It can detect your movement posture, such as Walking, Running, Standing still. Features  Ultra-low power  Programmable functionality  On-chip FIFO  On-chip interrupt features Auto-low power/Auto wakeup Activity/In-activity Step counter Activity Recognition(Walking,Running,Standing still) Orientation detection Tap/Double tap     Specification Item Value  Operating Voltage  3.3V / 5V  Power consumption  18uA @5V   14uA @3.3V  Operating Temperature  ‐40Ԩ ~ +85Ԩ  Acceleration Range  ±2g, ±4g, ±8g, ±16g  Sensitivity  1024LSB/g @±2g   512LSB/g @±4g  256LSB/g @±8g  128LSB/g @±16g  Interface  I2C  I2C Address  0x15(default) / 0x14(optional)  Typical applications    Step Counting with ultra-low current consumption for extensive battery lifetime  Fitness applications / Activity Tracking  Tap / double tap sensing  Drop detection for warranty logging  Window/door measurements for climate control and alarm systems   Hardware Overview Pin Out     Schemaitc Power The typical voltage of BMA400 is 1.8V, so we use the XC6206P182MR chip to provide a stable 1.8V. The input of XC6206P33 ranges from 1.8V to 6.0V, so you can use this module with your Arduino both in 3.3V and 5V. Bi-directional level shifter circuit This is a typical Bi-directional level shifter circuit to connect two different voltage section of an I2C bus. The I2C bus of this sensor use 1.8V, if the I2C bus of the Arduino use 5V or 3.3v, this circuit will be needed. In the schematic above, Q1 and Q2 are N-Channel MOSFET CJ2102, which act as a bidirectional switch. In order to better understand this part, you can refer to the AN10441     Platforms Supported Arduino Raspberry Pi  BeagleBone  Wio  LinkIt ONE            Caution The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library. Getting Started Play With Arduino Hardware Materials required Seeeduino V4.2 Base Shield    Grove BMA400    Note 1 Please plug the USB cable gently, otherwise you may damage the port. Please use the USB cable with 4 wires inside, the 2 wires cable can't transfer data. If you are not sure about the wire you have, you can click here to buy 2 Each Grove module comes with a Grove cable when you buy. In case you lose the Grove cable, you can click here to buy.        Step 1. Connect the Grove - 3-Axis Digital Accelerometer ±16g Ultra-low Power (BMA400) to port I2C of Grove-Base Shield.  Step 2. Plug Grove - Base Shield into Seeeduino.  Step 3. Connect Seeeduino to PC via a USB cable. Note If we don't have Grove Base Shield, We also can directly connect this module to Seeeduino as below. Seeeduino Grove Cable  Grove BMA400  GND  Black  GND  5V or 3.3V  Red  VCC  SDA  White  SDA  SCL  Yellow  SCL  Software Attention If this is the first time you work with Arduino, we strongly recommend you to see Getting Started with Arduinobefore the start.      Step 1. Download the Seeed_BMA400 Library from Github.  Step 2. Refer to How to install library to install library for Arduino.  Step 3. Restart the Arduino IDE. Open the example, you can open it in the following three ways： a. Open it directly in the Arduino IDE via the path: File → Examples → Grove 3Axis Digital Accelerometer ±16g Ultra-low Power(BMA400) → BMA400_Example. b. Open it in your computer by click the BMA400_Example.ino which you can find in the folder XXXX\Arduino\libraries\Grove_3Axis_Digital_Accelerometer_BMA40 0-master\examples\BMA400_Example, XXXX is the location you installed the Arduino IDE. c. Or, you can just click the icon in upper right corner of the code block to copy the following code into a new sketch in the Arduino IDE.     1#include "BMA400.h" 2 3float x = 0, y = 0, z = 0; 4int16_t temp = 0; 5 6void setup(void) 7{ 8 Wire.begin(); 9 10 Serial.begin(115200); 11 while(!Serial); 12 Serial.println("BMA400 Raw Data"); 13 14 while(1) 15 { if(bma400.isConnection()) 16 { 17 bma400.initialize(); 18 Serial.println("BMA400 is connected"); 19 break; 20 } 21 else Serial.println("BMA400 is not connected"); 22 23 delay(2000); 24 25 } 26} 27 28void loop(void) 29{ 30 bma400.getAcceleration(&x, &y, &z); 31 temp = bma400.getTemperature(); 32 33 Serial.print(x); 34 Serial.print(","); 35 Serial.print(y); 36 Serial.print(","); 37 Serial.print(z); 38 Serial.print(","); 39 40 Serial.print(temp); 41 42 Serial.println(); 43 44 delay(50); 45} Attention The library file may be updated. This code may not be applicable to the updated library file, so we recommend that you use the first two methods.    Step 4. Upload the demo. If you do not know how to upload the code, please check How to upload code.    Step 5. Open the Serial Monitor of Arduino IDE by click Tool-> Serial Monitor. Or tap the Ctrl + Shift + M key at the same time. Set the baud rate to 115200. Success If every thing goes well, it may show as below: 1BMA400 Raw Data 2BMA400 is connected 385.94,357.42,916.02,23 4-148.44,222.66,464.84,23 5-626.95,320.31,1109.38,23 6-500.00,-111.33,144.53,23 7-398.44,-232.42,433.59,23 8-783.20,-255.86,638.67,23 9-1453.13,-552.73,822.27,23 The raw data format: X-axis/unit mg; Y-axis/unit mg; Z-axis/unit mg; temperature/unit Ԩ Tech Support Please do not hesitate to submit the issue into our forum                               http://wiki.seeedstudio.com/Grove‐3‐Axis_Digital_Accelerometer%C2%B116g_Ultra‐low_Power‐BMA400/ 12‐4‐18