Hi everyone!
I am a HUGE newbie
I've been working on a water rocket with automating parachute mechanism, for a school project.
and the parachute will be connected with the servo
so when the rocket tilts down the servo will spin something like 90°.
I've used a:
-gy-521 accelerometer
-Arduino Nano every (with headers)
-servo motor (from the officially Arduino starter kit)
and then I've looking for some examples with the gy-521 and then I found:
and I've found an example for a servo https://www.arduino.cc/en/Tutorial/Sweep
and then I've tried to combine them.
But can somebody make so the gy-521 is more critic so if the gy-521 rotate something like 90° and then activate the motor?
I've tried but it didn't work. 
here is my code:
// (c) Michael Schoeffler 2017, http://www.mschoeffler.de
#include "Wire.h" // This library allows you to communicate with I2C devices.
#include <Servo.h>
const int MPU_ADDR=0x68; // I2C address of the MPU-6050. If AD0 pin is set to HIGH, the I2C address will be 0x69.
Servo myservo;
int16_t accelerometer_x, accelerometer_y, accelerometer_z; // variables for accelerometer raw data
int16_t gyro_x, gyro_y, gyro_z; // variables for gyro raw data
int16_t temperature; // variables for temperature data
int pos = 0;
#define LED_LB 2 // LED left bottom
#define LED_RB 3 // LED right bottom
#define LED_RT 4 // LED right top
#define LED_LT 5 // LED left top
char tmp_str[7]; // temporary variable used in convert function
char* convert_int16_to_str(int16_t i) { // converts int16 to string. Moreover, resulting strings will have the same length in the debug monitor.
sprintf(tmp_str, "%6d", i);
return tmp_str;
}
void setup() {
myservo.attach(9);
Serial.begin(9600);
pinMode(LED_LB, OUTPUT);
pinMode(LED_RB, OUTPUT);
pinMode(LED_RT, OUTPUT);
pinMode(LED_LT, OUTPUT);
digitalWrite(LED_LB, LOW);
digitalWrite(LED_RB, LOW);
digitalWrite(LED_RT, LOW);
digitalWrite(LED_LT, LOW);
Wire.begin();
Wire.beginTransmission(MPU_ADDR); // Begins a transmission to the I2C slave (GY-521 board)
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)
Wire.endTransmission(true);
}
void loop() {
Wire.beginTransmission(MPU_ADDR);
Wire.write(0x3B); // starting with register 0x3B (ACCEL_XOUT_H) [MPU-6000 and MPU-6050 Register Map and Descriptions Revision 4.2, p.40]
Wire.endTransmission(false); // the parameter indicates that the Arduino will send a restart. As a result, the connection is kept active.
Wire.requestFrom(MPU_ADDR, 7*2, true); // request a total of 7*2=14 registers
// "Wire.read()<<8 | Wire.read();" means two registers are read and stored in the same variable
accelerometer_x = Wire.read()<<8 | Wire.read(); // reading registers: 0x3B (ACCEL_XOUT_H) and 0x3C (ACCEL_XOUT_L)
accelerometer_y = Wire.read()<<8 | Wire.read(); // reading registers: 0x3D (ACCEL_YOUT_H) and 0x3E (ACCEL_YOUT_L)
accelerometer_z = Wire.read()<<8 | Wire.read(); // reading registers: 0x3F (ACCEL_ZOUT_H) and 0x40 (ACCEL_ZOUT_L)
temperature = Wire.read()<<8 | Wire.read(); // reading registers: 0x41 (TEMP_OUT_H) and 0x42 (TEMP_OUT_L)
gyro_x = Wire.read()<<8 | Wire.read(); // reading registers: 0x43 (GYRO_XOUT_H) and 0x44 (GYRO_XOUT_L)
gyro_y = Wire.read()<<8 | Wire.read(); // reading registers: 0x45 (GYRO_YOUT_H) and 0x46 (GYRO_YOUT_L)
gyro_z = Wire.read()<<8 | Wire.read(); // reading registers: 0x47 (GYRO_ZOUT_H) and 0x48 (GYRO_ZOUT_L)
// print out data
Serial.print("aX = "); Serial.print(convert_int16_to_str(accelerometer_x));
Serial.print(" | aY = "); Serial.print(convert_int16_to_str(accelerometer_y));
Serial.print(" | aZ = "); Serial.print(convert_int16_to_str(accelerometer_z));
// the following equation was taken from the documentation [MPU-6000/MPU-6050 Register Map and Description, p.30]
Serial.print(" | tmp = "); Serial.print(temperature/340.00+36.53);
Serial.print(" | gX = "); Serial.print(convert_int16_to_str(gyro_x));
Serial.print(" | gY = "); Serial.print(convert_int16_to_str(gyro_y));
Serial.print(" | gZ = "); Serial.print(convert_int16_to_str(gyro_z));
Serial.println();
if (accelerometer_x < 1000 && accelerometer_y < -8000) {
for (pos = 0; pos <= 180; pos += 1) {
myservo.write(pos);
delay(15);
}
digitalWrite(LED_LB, HIGH);
digitalWrite(LED_RB, HIGH);
digitalWrite(LED_RT, LOW);
digitalWrite(LED_LT, LOW);
} else if (accelerometer_x < 1000 && accelerometer_y > 8000) {
for (pos = 0; pos <= 180; pos -= 1) {
myservo.write(pos);
delay(15);
}
digitalWrite(LED_LB, LOW);
digitalWrite(LED_RB, LOW);
digitalWrite(LED_RT, HIGH);
digitalWrite(LED_LT, HIGH);
} else if (accelerometer_x > 8000 && accelerometer_y < 1000) {
for (pos = 0; pos <= 180; pos += 1) {
myservo.write(pos);
delay(15);
}
digitalWrite(LED_LB, LOW);
digitalWrite(LED_RB, HIGH);
digitalWrite(LED_RT, HIGH);
digitalWrite(LED_LT, LOW);
} else if (accelerometer_x < -8000 && accelerometer_y < 1000) {
for (pos = 0; pos <= 180; pos -= 1) {
myservo.write(pos);
delay(15);
}
digitalWrite(LED_LB, HIGH);
digitalWrite(LED_RB, LOW);
digitalWrite(LED_RT, LOW);
digitalWrite(LED_LT, HIGH);
} else {
digitalWrite(LED_LB, LOW);
digitalWrite(LED_RB, LOW);
digitalWrite(LED_RT, LOW);
digitalWrite(LED_LT, LOW);
}
// delay
delay(10);
}
Best regards Aleksander