weatherstation/firmware/libraries/APDS9930-master/examples/ProximityInterrupt/ProximityInterrupt.ino

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/****************************************************************
ProximityInterrupt.ino
APDS-9930 Ambient light and proximity sensor
Davide Depau
December 11, 2015
https://github.com/Davideddu/APDS9930
Shawn Hymel @ SparkFun Electronics
October 24, 2014
https://github.com/sparkfun/APDS-9930_RGB_and_Gesture_Sensor
Tests the proximity interrupt abilities of the APDS-9930.
Configures the APDS-9930 over I2C and waits for an external
interrupt based on high or low proximity conditions. Move your
hand near the sensor and watch the LED on pin 13.
Hardware Connections:
IMPORTANT: The APDS-9930 can only accept 3.3V!
Arduino Pin APDS-9930 Board Function
3.3V VCC Power
GND GND Ground
A4 SDA I2C Data
A5 SCL I2C Clock
2 INT Interrupt
13 - LED
Resources:
Include Wire.h and APDS9930.h
Development environment specifics:
Written in Arduino 1.6.5
Tested with Arduino Uno and Mega
This code is beerware; if you see me (or any other SparkFun
employee) at the local, and you've found our code helpful, please
buy us a round!
Distributed as-is; no warranty is given.
****************************************************************/
#define DUMP_REGS
#include <Wire.h>
#include <APDS9930.h>
// Pins
#define APDS9930_INT 2 // Needs to be an interrupt pin
#define LED_PIN 13 // LED for showing interrupt
// Constants
#define PROX_INT_HIGH 600 // Proximity level for interrupt
#define PROX_INT_LOW 0 // No far interrupt
// Global variables
APDS9930 apds = APDS9930();
uint16_t proximity_data = 0;
volatile bool isr_flag = false;
void setup() {
// Set LED as output
pinMode(LED_PIN, OUTPUT);
pinMode(APDS9930_INT, INPUT);
// Initialize Serial port
Serial.begin(9600);
Serial.println();
Serial.println(F("------------------------------"));
Serial.println(F("APDS-9930 - ProximityInterrupt"));
Serial.println(F("------------------------------"));
// Initialize interrupt service routine
attachInterrupt(0, interruptRoutine, FALLING);
// Initialize APDS-9930 (configure I2C and initial values)
if ( apds.init() ) {
Serial.println(F("APDS-9930 initialization complete"));
} else {
Serial.println(F("Something went wrong during APDS-9930 init!"));
}
// Adjust the Proximity sensor gain
if ( !apds.setProximityGain(PGAIN_2X) ) {
Serial.println(F("Something went wrong trying to set PGAIN"));
}
// Set proximity interrupt thresholds
if ( !apds.setProximityIntLowThreshold(PROX_INT_LOW) ) {
Serial.println(F("Error writing low threshold"));
}
if ( !apds.setProximityIntHighThreshold(PROX_INT_HIGH) ) {
Serial.println(F("Error writing high threshold"));
}
// Start running the APDS-9930 proximity sensor (interrupts)
if ( apds.enableProximitySensor(true) ) {
Serial.println(F("Proximity sensor is now running"));
} else {
Serial.println(F("Something went wrong during sensor init!"));
}
#ifdef DUMP_REGS
/* Register dump */
uint8_t reg;
uint8_t val;
for(reg = 0x00; reg <= 0x19; reg++) {
if( (reg != 0x10) && \
(reg != 0x11) )
{
apds.wireReadDataByte(reg, val);
Serial.print(reg, HEX);
Serial.print(": 0x");
Serial.println(val, HEX);
}
}
apds.wireReadDataByte(0x1E, val);
Serial.print(0x1E, HEX);
Serial.print(": 0x");
Serial.println(val, HEX);
#endif
}
void loop() {
// If interrupt occurs, print out the proximity level
if ( isr_flag ) {
// Read proximity level and print it out
if ( !apds.readProximity(proximity_data) ) {
Serial.println("Error reading proximity value");
} else {
Serial.print("Proximity detected! Level: ");
Serial.println(proximity_data);
}
// Turn on LED for a half a second
digitalWrite(LED_PIN, HIGH);
delay(500);
digitalWrite(LED_PIN, LOW);
// Reset flag and clear APDS-9930 interrupt (IMPORTANT!)
isr_flag = false;
if ( !apds.clearProximityInt() ) {
Serial.println("Error clearing interrupt");
}
}
}
void interruptRoutine() {
isr_flag = true;
}