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| #include <LiquidCrystal.h>
#include <Wire.h>
#include "fonctions.h"
#define X 0 // X axis
#define Y 1 // Y axis
#define Z 2 // Z axis
#define MPU_ADDRESS 0x68 // I2C address of the MPU-6050
#define FREQ 260 // Sampling frequency
#define SSF_GYRO 65.5 // Sensitivity Scale Factor of the gyro from datasheet
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int gyro_raw[3] = {0, 0, 0};
// Average gyro offsets of each axis in that order: X, Y, Z
long gyro_offset[3] = {0, 0, 0};
// Calculated angles from gyro's values in that order: X, Y, Z
float gyro_angle[3] = {0, 0, 0};
// The RAW values got from accelerometer (in m/sec²) in that order: X, Y, Z
int acc_raw[3] = {0 , 0 , 0};
// Calculated angles from accelerometer's values in that order: X, Y, Z
float acc_angle[3] = {0, 0, 0};
int moy;
boolean initialise;
int temperature;
unsigned int period; // Sampling period
unsigned long loop_timer;
float fspeed;
void setup() {
Serial.begin(9600);
lcd.begin(16, 2);
Wire.begin();
TWBR = 12; // Set the I2C clock speed to 400kHz.
period = (1000000 / FREQ);
loop_timer = micros();
setupMpu6050Registers();
CalibrerMPU();
Serial.print("moyenne : ");
Serial.println(moy);
Serial.print(period);
initialise = true;
}
void loop() {
fspeed += vitesse();
lcd.setCursor(0, 0);
lcd.print("vitesse: ");
lcd.setCursor(8, 0);
lcd.print(fspeed);
lcd.setCursor(0, 1);
lcd.print(fspeed*18/5);
while (micros() - loop_timer < period);
loop_timer = micros();
}
void setupMpu6050Registers() {
// Configure power management
Wire.beginTransmission(MPU_ADDRESS); // Start communication with MPU
Wire.write(0x6B); // Request the PWR_MGMT_1 register
Wire.write(0x00); // Apply the desired configuration to the register
Wire.endTransmission(); // End the transmission
// Configure the gyro's sensitivity
Wire.beginTransmission(MPU_ADDRESS); // Start communication with MPU
Wire.write(0x1B); // Request the GYRO_CONFIG register
Wire.write(0x08); // Apply the desired configuration to the register : ±500°/s
Wire.endTransmission(); // End the transmission
// Configure the acceleromter's sensitivity
Wire.beginTransmission(MPU_ADDRESS); // Start communication with MPU
Wire.write(0x1C); // Request the ACCEL_CONFIG register
Wire.write(0x10); // Apply the desired configuration to the register : ±8g
Wire.endTransmission(); // End the transmission
Wire.beginTransmission(MPU_ADDRESS); // Start communication with MPU
Wire.write(0x1A); // Request the CONFIG register
Wire.write(0x03); // Set Digital Low Pass Filter about ~43Hz
Wire.endTransmission(); // End the transmission
}
void readSensor() {
Wire.beginTransmission(MPU_ADDRESS); // Start communicating with the MPU-6050
Wire.write(0x3B); // Send the requested starting register
Wire.endTransmission(); // End the transmission
Wire.requestFrom(MPU_ADDRESS, 14); // Request 14 bytes from the MPU-6050
// Wait until all the bytes are received
while (Wire.available() < 14);
acc_raw[X] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the acc_raw[X] variable
acc_raw[Y] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the acc_raw[Y] variable
acc_raw[Z] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the acc_raw[Z] variable
temperature = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the temperature variable
gyro_raw[X] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the gyro_raw[X] variable
gyro_raw[Y] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the gyro_raw[Y] variable
gyro_raw[Z] = Wire.read() << 8 | Wire.read(); // Add the low and high byte to the gyro_raw[Z] variable
}
float vitesse(){
float vitesse;
readSensor();
/*acc_raw[X] = sqrt(pow(acc_raw[X],2)+pow(acc_raw[Y], 2)+ pow(acc_raw[Z], 2));*/
vitesse = ((9.81*(acc_raw[X]))/4.096)*0.004; // 0.004 corespond à la période en secondes
Serial.print("x: ");
Serial.println(acc_raw[X]-104);
if (initialise){
return round(vitesse-moy);
}
else{
return vitesse;
}
}
void CalibrerMPU(){
int tours;
float Vitesse;
for(tours = 0 ; tours <= 300 ; tours ++){
Vitesse += vitesse();
delay(3);
}
moy = Vitesse/300;
} |
Mesurer une vitesse avec un MPU6050
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Envoyé par LSBTD
Ce qui est du à l'accélération de la pesanteur qui se répartit sur les 3 axes.
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