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L'idea del progetto Uno e' avere un accelerometro che tramite un interrupt sveglia una Arduino Uno che tramite una radio per telemetria da droni invia un segnale ad un ricevitore remoto
Per risparmiare batteria il trasmettitore viene alimentato solo quando la Arduino si risveglia mediante un relay
I trasmettitori radio sono quelli indicati a questo link. Sono delle semplici radio che si comportano come delle seriali virtuali a 57600 e sono principalmente usati nell'ambito dei droni. Le radio vengono vendute a coppie per una comunicazione punto-punto ed una (o entrambe) hanno un connettore USB piu' un connettore a 6 pin...visto che vengono venduti per droni hanno dei cavi gia' predisposti per PixHawk o simili in alcuni casi e' difficile adattare i cavi per Arduino in modo semplice..se ne trovano alcuni come quello in foto che permettono l'inserimento dei pin
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/* *********************************************
* SparkFun_ADXL345_Example
* Triple Axis Accelerometer Breakout - ADXL345
* Hook Up Guide Example
*
* Utilizing Sparkfun's ADXL345 Library
* Bildr ADXL345 source file modified to support
* both I2C and SPI Communication
*
* E.Robert @ SparkFun Electronics
* Created: Jul 13, 2016
* Updated: Sep 06, 2016
*
* Development Environment Specifics:
* Arduino 1.6.11
*
* Hardware Specifications:
* SparkFun ADXL345
* Arduino Uno
* *********************************************/
#include <SparkFun_ADXL345.h> // SparkFun ADXL345 Library
#include <LowPower.h>
ADXL345 adxl = ADXL345(); // USE FOR I2C COMMUNICATION
int interruptPin = 2; // Setup pin 2 to be the interrupt pin (for most Arduino Boards)
const int wakeUpPin = 2; //For good accelaration return values I comment out this
void wakeUp()
{
}
void setup(){
Serial.begin(57600); // Start the serial terminal
Serial.flush();
pinMode(7, OUTPUT);
adxl.powerOn(); // Power on the ADXL345
adxl.setRangeSetting(2); // Give the range settings
// Accepted values are 2g, 4g, 8g or 16g
// Higher Values = Wider Measurement Range
// Lower Values = Greater Sensitivity
adxl.setSpiBit(0); // Configure the device to be in 4 wire SPI mode when set to '0' or 3 wire SPI mode when set to 1
// Default: Set to 1
// SPI pins on the ATMega328: 11, 12 and 13 as reference in SPI Library
adxl.setActivityXYZ(1, 1, 1); // Set to activate movement detection in the axes "adxl.setActivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
adxl.setActivityThreshold(75); // 62.5mg per increment // Set activity // Inactivity thresholds (0-255)
adxl.setInactivityXYZ(1, 1, 1); // Set to detect inactivity in all the axes "adxl.setInactivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
adxl.setInactivityThreshold(75); // 62.5mg per increment // Set inactivity // Inactivity thresholds (0-255)
adxl.setTimeInactivity(10); // How many seconds of no activity is inactive?
adxl.setTapDetectionOnXYZ(0, 0, 1); // Detect taps in the directions turned ON "adxl.setTapDetectionOnX(X, Y, Z);" (1 == ON, 0 == OFF)
// Set values for what is considered a TAP and what is a DOUBLE TAP (0-255)
adxl.setTapThreshold(50); // 62.5 mg per increment
adxl.setTapDuration(15); // 625 μs per increment
adxl.setDoubleTapLatency(80); // 1.25 ms per increment
adxl.setDoubleTapWindow(200); // 1.25 ms per increment
// Set values for what is considered FREE FALL (0-255)
adxl.setFreeFallThreshold(7); // (5 - 9) recommended - 62.5mg per increment
adxl.setFreeFallDuration(30); // (20 - 70) recommended - 5ms per increment
// Setting all interupts to take place on INT1 pin
adxl.setImportantInterruptMapping(1, 1, 1, 1, 1); // Sets "adxl.setEveryInterruptMapping(single tap, double tap, free fall, activity, inactivity);"
// Accepts only 1 or 2 values for pins INT1 and INT2. This chooses the pin on the ADXL345 to use for Interrupts.
// This library may have a problem using INT2 pin. Default to INT1 pin.
// Turn on Interrupts for each mode (1 == ON, 0 == OFF)
adxl.InactivityINT(1);
adxl.ActivityINT(1);
adxl.FreeFallINT(1);
adxl.doubleTapINT(1);
adxl.singleTapINT(1);
attachInterrupt(digitalPinToInterrupt(interruptPin), ADXL_ISR, RISING); // Attach Interrupt
pinMode(wakeUpPin, INPUT);
}
void loop(){
attachInterrupt(0, wakeUp, RISING);
int x,y,z;
adxl.readAccel(&x, &y, &z); // Read the accelerometer values and store them in variables declared above x,y,z
digitalWrite(7, HIGH);
delay(500);
Serial.print(x);
Serial.print(", ");
Serial.print(y);
Serial.print(", ");
Serial.println(z);
digitalWrite(7, LOW);
ADXL_ISR();
}
void ADXL_ISR() {
byte interrupts = adxl.getInterruptSource();
// Free Fall Detection
if(adxl.triggered(interrupts, ADXL345_FREE_FALL)){
Serial.println("*** FREE FALL ***");
//add code here to do when free fall is sensed
}
// Inactivity
if(adxl.triggered(interrupts, ADXL345_INACTIVITY)){
Serial.flush();
adxl.InactivityINT(0);
LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
}
// Activity
if(adxl.triggered(interrupts, ADXL345_ACTIVITY)){
Serial.println("*** ACTIVITY ***");
adxl.InactivityINT(1);
//add code here to do when activity is sensed
}
// Double Tap Detection
if(adxl.triggered(interrupts, ADXL345_DOUBLE_TAP)){
Serial.println("*** DOUBLE TAP ***");
adxl.InactivityINT(1);
//add code here to do when a 2X tap is sensed
}
// Tap Detection
if(adxl.triggered(interrupts, ADXL345_SINGLE_TAP)){
Serial.println("*** TAP ***");
adxl.InactivityINT(1);
}
}
void blink() {
}
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