180 lines
No EOL
4.9 KiB
C++
180 lines
No EOL
4.9 KiB
C++
/****************************************************************
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AmbientLightInterrupt.ino
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APDS-9930 RGB and Gesture Sensor
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Shawn Hymel @ SparkFun Electronics
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October 24, 2014
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https://github.com/sparkfun/APDS-9930_RGB_and_Gesture_Sensor
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Tests the ambient light interrupt abilities of the APDS-9930.
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Configures the APDS-9930 over I2C and waits for an external
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interrupt based on high or low light conditions. Try covering
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the sensor with your hand or bringing the sensor close to a
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bright light source. You might need to adjust the LIGHT_INT_HIGH
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and LIGHT_INT_LOW values to get the interrupt to work correctly.
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Hardware Connections:
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IMPORTANT: The APDS-9930 can only accept 3.3V!
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Arduino Pin APDS-9930 Board Function
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3.3V VCC Power
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GND GND Ground
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A4 SDA I2C Data
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A5 SCL I2C Clock
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2 INT Interrupt
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13 - LED
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Resources:
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Include Wire.h and APDS9930.h
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Development environment specifics:
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Written in Arduino 1.0.5
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Tested with SparkFun Arduino Pro Mini 3.3V
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This code is beerware; if you see me (or any other SparkFun
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employee) at the local, and you've found our code helpful, please
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buy us a round!
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Distributed as-is; no warranty is given.
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****************************************************************/
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#define DUMP_REGS
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#include <Wire.h>
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#include <APDS9930.h>
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// Pins
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#define APDS9930_INT 2 // Needs to be an interrupt pin
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#define LED_PIN 13 // LED for showing interrupt
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// Constants
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#define LIGHT_INT_HIGH 1000 // High light level for interrupt
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#define LIGHT_INT_LOW 10 // Low light level for interrupt
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// Global variables
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APDS9930 apds = APDS9930();
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float ambient_light = 0;
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uint16_t ch0 = 0;
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uint16_t ch1 = 1;
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volatile bool isr_flag = false;
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uint16_t threshold = 0;
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void setup() {
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// Set LED as output
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pinMode(LED_PIN, OUTPUT);
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pinMode(APDS9930_INT, INPUT);
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// Initialize Serial port
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Serial.begin(9600);
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Serial.println();
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Serial.println(F("----------------------------"));
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Serial.println(F("APDS-9930 - Light Interrupts"));
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Serial.println(F("----------------------------"));
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// Initialize interrupt service routine
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attachInterrupt(0, interruptRoutine, FALLING);
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// Initialize APDS-9930 (configure I2C and initial values)
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if ( apds.init() ) {
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Serial.println(F("APDS-9930 initialization complete"));
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} else {
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Serial.println(F("Something went wrong during APDS-9930 init!"));
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}
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// Set high and low interrupt thresholds
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if ( !apds.setLightIntLowThreshold(LIGHT_INT_LOW) ) {
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Serial.println(F("Error writing low threshold"));
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}
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if ( !apds.setLightIntHighThreshold(LIGHT_INT_HIGH) ) {
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Serial.println(F("Error writing high threshold"));
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}
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// Start running the APDS-9930 light sensor (no interrupts)
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if ( apds.enableLightSensor(false) ) {
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Serial.println(F("Light sensor is now running"));
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} else {
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Serial.println(F("Something went wrong during light sensor init!"));
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}
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// Read high and low interrupt thresholds
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if ( !apds.getLightIntLowThreshold(threshold) ) {
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Serial.println(F("Error reading low threshold"));
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} else {
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Serial.print(F("Low Threshold: "));
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Serial.println(threshold);
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}
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if ( !apds.getLightIntHighThreshold(threshold) ) {
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Serial.println(F("Error reading high threshold"));
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} else {
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Serial.print(F("High Threshold: "));
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Serial.println(threshold);
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}
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// Enable interrupts
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if ( !apds.setAmbientLightIntEnable(1) ) {
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Serial.println(F("Error enabling interrupts"));
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}
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#ifdef DUMP_REGS
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/* Register dump */
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uint8_t reg;
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uint8_t val;
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for(reg = 0x00; reg <= 0x19; reg++) {
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if( (reg != 0x10) && \
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(reg != 0x11) )
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{
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apds.wireReadDataByte(reg, val);
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Serial.print(reg, HEX);
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Serial.print(": 0x");
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Serial.println(val, HEX);
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}
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}
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apds.wireReadDataByte(0x1E, val);
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Serial.print(0x1E, HEX);
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Serial.print(": 0x");
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Serial.println(val, HEX);
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#endif
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// Wait for initialization and calibration to finish
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delay(500);
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}
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void loop() {
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// If interrupt occurs, print out the light levels
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if ( isr_flag ) {
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// Read the light levels (ambient, red, green, blue) and print
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if ( !apds.readAmbientLightLux(ambient_light) ||
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!apds.readCh0Light(ch0) ||
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!apds.readCh1Light(ch1) ) {
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Serial.println("Error reading light values");
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} else {
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Serial.print("Interrupt! Ambient: ");
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Serial.print(ambient_light);
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Serial.print(F(" Ch0: "));
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Serial.print(ch0);
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Serial.print(F(" Ch1: "));
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Serial.println(ch1);
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}
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// Turn on LED for a half a second
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digitalWrite(LED_PIN, HIGH);
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delay(500);
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digitalWrite(LED_PIN, LOW);
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// Reset flag and clear APDS-9930 interrupt (IMPORTANT!)
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isr_flag = false;
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if ( !apds.clearAmbientLightInt() ) {
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Serial.println("Error clearing interrupt");
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}
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}
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}
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void interruptRoutine() {
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isr_flag = true;
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} |