I am using Arduino UNO and has kept in SLEEP_MODE_PWR_DOWN mode & want it to wakeup using MPU6050 hardware INT pin (which should send a signal when MPU is in motion). I have used the article https://lukelectro.wordpress.com/2016/08/11/how-to-enable-motion-detection-interrupt-on-mpu6050/
/*I am using Arduino UNO and has kept in SLEEP_MODE_PWR_DOWN mode & want it to wakeup using MPU6050 hardware INT pin (which should send a signal when MPU is in motion)*/
//Had used the article https://lukelectro.wordpress.com/2016/08/11/how-to-enable-motion-detection-interrupt-on-mpu6050/
#include <Wire.h>
//Analog port 4 (A4) = SDA (serial data)
//Analog port 5 (A5) = SCL (serial clock)
#define SIGNAL_PATH_RESET 0x68
#define I2C_SLV0_ADDR 0x37
#define ACCEL_CONFIG 0x1C
#define MOT_THR 0x1F // Motion detection threshold bits [7:0]
#define MOT_DUR 0x20 // Duration counter threshold for motion interrupt generation, 1 kHz rate, LSB = 1 ms
#define MOT_DETECT_CTRL 0x69
#define INT_ENABLE 0x38
#define WHO_AM_I_MPU6050 0x75 // Should return 0x68
#define INT_STATUS 0x3A
//when nothing connected to AD0 than address is 0x68
#define ADO 0
#if ADO
#define MPU6050_ADDRESS 0x69 // Device address when ADO = 1
#else
#define MPU6050_ADDRESS 0x68 // Device address when ADO = 0
#endif
/* Example for using write byte
Configure the accelerometer for self-test
writeByte(MPU6050_ADDRESS, ACCEL_CONFIG, 0xF0); // Enable self test on all three axes and set accelerometer range to +/- 8 g */
void writeByte(uint8_t address, uint8_t subAddress, uint8_t data)
{
Wire.begin();
Wire.beginTransmission(address); // Initialize the Tx buffer
Wire.write(subAddress); // Put slave register address in Tx buffer
Wire.write(data); // Put data in Tx buffer
Wire.endTransmission(); // Send the Tx buffer
// Serial.println("mnnj");
}
//example showing using readbytev ---- readByte(MPU6050_ADDRESS, GYRO_CONFIG);
uint8
_t readByte(uint8_t address, uint8_t subAddress)
{
uint8_t data; // `data` will store the register data
Wire.beginTransmission(address); // Initialize the Tx buffer
Wire.write(subAddress); // Put slave register address in Tx buffer
Wire.endTransmission(false); // Send the Tx buffer, but send a restart to keep connection alive
Wire.requestFrom(address, (uint8_t) 1); // Read one byte from slave register address
data = Wire.read(); // Fill Rx buffer with result
return data; // Return data read from slave register
}
void setup()
{
/*
* #define SIGNAL_PATH_RESET 0x68
#define I2C_SLV0_ADDR 0x37
#define ACCEL_CONFIG 0x1C
#define MOT_THR 0x1F // Motion detection threshold bits [7:0]
#define MOT_DUR 0x20 // Duration counter threshold for motion interrupt generation, 1 kHz rate, LSB = 1 ms
#define MOT_DETECT_CTRL 0x69
#define INT_ENABLE 0x38
#define WHO_AM_I_MPU6050 0x75 // Should return 0x68
#define INT_STATUS 0x3A*/
Serial.begin(9600);
writeByte( MPU6050_ADDRESS, SIGNAL_PATH_RESET, 0x07);//Reset all internal signal paths in the MPU-6050 by writing 0x07 to register 0x68;
writeByte( MPU6050_ADDRESS, I2C_SLV0_ADDR, 0x20);//write register 0x37 to select how to use the interrupt pin. For an active high, push-pull signal that stays until register (decimal) 58 is read, write 0x20.
writeByte( MPU6050_ADDRESS, ACCEL_CONFIG, 0x01);//Write register 28 (==0x1C) to set the Digital High Pass Filter, bits 3:0. For example set it to 0x01 for 5Hz. (These 3 bits are grey in the data sheet, but they are used! Leaving them 0 means the filter always outputs 0.)
writeByte( MPU6050_ADDRESS, MOT_THR, 0x14); //Write the desired Motion threshold to register 0x1F (For example, write decimal 20).
writeByte( MPU6050_ADDRESS, MOT_DUR, 0x01 ); //Set motion detect duration to 1 ms; LSB is 1 ms @ 1 kHz rate
writeByte( MPU6050_ADDRESS, MOT_DETECT_CTRL, 0x15); //to register 0x69, write the motion detection decrement and a few other settings (for example write 0x15 to set both free-fall and motion decrements to 1 and accelerometer start-up delay to 5ms total by adding 1ms. )
writeByte( MPU6050_ADDRESS, INT_ENABLE, 0x40 ); //write register 0x38, bit 6 (0x40), to enable motion detection interrupt. */
pinMode(13, OUTPUT); // sets the digital LED pin 13 as output
pinMode(7, INPUT); // sets the digital pin 7 as input
}
uint16_t readdata;
void loop()
{
Serial.println("scdf");
if(digitalRead(7)==1)
{
while(1)
{
digitalWrite(13, 1);
delay(100);
}
}
// readdata = readByte(MPU6050_ADDRESS,WHO_AM_I_MPU6050);
// Serial.println(readdata);
}
