The simplest tilt sensor production-ADXL345

1#include <Wire.h>  // Wire library - used for I2C communication
2#include <Adafruit_GFX.h>
3#include <Adafruit_SSD1306.h>//OLED library
4
5Adafruit_SSD1306 display(128,64, &Wire, -1);//Set the screen size of OLED
6
7int ADXL345 = 0x53;         // The ADXL345 sensor I2C address
8float X_out, Y_out, Z_out;  // Outputs
9void setup() {
10  Serial.begin(9600);
11  Wire.begin();             // Initiate the Wire library
12  // Set ADXL345 in measuring mode
13  Wire.beginTransmission(ADXL345); // Start communicating with the device
14  Wire.write(0x2D); // Access/ talk to POWER_CTL Register - 0x2D
15  // Enable measurement
16  Wire.write(8); // (8dec -> 0000 1000 binary) Bit D3 High for measuring enable
17  Wire.endTransmission();
18  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);//Initialize OLED and set IIC communication address
19  delay(10);
20}
21void loop() {
22  Wire.beginTransmission(ADXL345);
23  Wire.write(0x32); // Start with register 0x32 (ACCEL_XOUT_H)
24  Wire.endTransmission(false);
25  Wire.requestFrom(ADXL345, 6, true); // Read 6 registers total, each axis value is stored in 2 registers
26  X_out = ( Wire.read()| Wire.read() << 8); // X-axis value
27  X_out = X_out/256; //For a range of +-2g, we need to divide the raw values by 256, according to the datasheet
28  Y_out = ( Wire.read()| Wire.read() << 8); // Y-axis value
29  Y_out = Y_out/256;
30  Z_out = ( Wire.read()| Wire.read() << 8); // Z-axis value
31  Z_out = Z_out/256;
32  Serial.print("Xa= ");
33  Serial.print(X_out);
34  Serial.print("   Ya= ");
35  Serial.print(Y_out);
36  Serial.print("   Za= ");
37  Serial.println(Z_out);
38  display.clearDisplay();//Clear screen
39  display.setTextColor(WHITE);//Setting text color, monochrome OLED is invalid, but must have
40  display.setTextSize(2);//Set text size
41  display.setCursor(0, 0);
42  display.print("X: ");
43  display.print(X_out);
44  display.setCursor(0, 20);
45  display.print("Y: ");
46  display.print(Y_out);
47  display.setCursor(0, 40);
48  display.print("Z: ");
49  display.print(Z_out);
50  display.display();//Execute Display
51  delay(100);
52}