DFR0486 Datasheet DFR0486 | P4-P6

DataCalibration

Due to sensor individual difference, we need make a calibration for each module. (Or you could skip

this step, and test the sensor directly.)

 Step 1

Turn the switch to "H" position, and connect the sensor according to the connection diagram.

Upload the testing code to Arduino.

DFRobot 3-axis calibration code

X——A0

Y——A1

Z——A2

void setup()

{

Serial.begin(9600);

}

void loop()

{

int x,y,z;

x=analogRead(0);

y=analogRead(1);

z=analogRead(2);

Serial.print("x= ");

Serial.print(x*5/1024.0,3);

Serial.print(',');

Serial.print("y= ");

Serial.print(y*5/1024.0,3);

Serial.print(',');

Serial.print("z= ");

Serial.println(z*5/1024.0,3);

delay(500);

}

 Step 2

Leave sensor resting horizontally on the desktop, keep the positive direction of Z-axis upwards.

Open the IDE serial monitor, and record a set of data. E.g.:

x= 0.776,y= 0.776,z= 1.157

Similarly, leave sensor resting horizontally on the desktop, keep the negative direction of Z-axis

upwards. Open the IDE serial monitor, and record another set of data. E.g.:

x= 0.776,y= 0.781,z= 0.688

Now, you could observe two sets of data, and you will find the value on X-axis & Y-axis are equal or

differ very little, but the value on Z-axis are quite different. This is because there is no accelerated

velocity on X-axis and Y-axis, when the sensor is resting horizontally. The module is only forced by

gravity, and its direction is always downward. With different posture, the gravitational acceleration

stays the same. In physics, we call it "g".

So, when the Z-axis upward, the value z should be "z=Z+g"; when the Z-axis downward, it will be

"z=Z+g". You could calculate the initial value of "Z", and the corresponding value of "g".

Z=(1.157+0.688)/2=0.923 mV

g=(1.157-0.688)/2=0.235 mV/g

Similarly, you could get sensor initial value "X" & "Y" and corresponding value of "g" on X-axis and

Y-axis.

Note: The gravitational acceleration are always downward, and its value are only related to the

local gravity. We regulate its direction as acceleration positive direction. For example: when the

object is moving upward with the acceleration of "a", its acceleration will be "g+a".

 Step 3

After the calibration, we have gotten every axis initial value and corresponding value of "g".

Upload the sample code, we will get the perfect acceleration velocity.

Note: In order to get the accurate data, we need do the calibration on each axis.

ArduinoSampleCode

Open Arduino IDE, copy the sample code to IDE window, click "Upload".

float X=0.774; //replace your value

float gx=0.237; //replace your value

float Y=0.781; //replace your value

float gy=0.21; //replace your value

P1-P3 P4-P6 P7-P8

DFR0486

Mfr. #:

Buy DFR0486

Manufacturer:

DFRobot

Description:

Display Development Tools Gravity I2C OLED 2864 Display

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

DFR0486