113 lines
2.9 KiB
Arduino
113 lines
2.9 KiB
Arduino
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/****************************************************************
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AmbientLightLED.ino
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Tests the ambient light sensing abilities of the
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APDS-9930. Configures APDS-9930 over I2C and polls the sensor for
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ambient light levels, which are displayed over the
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serial console.
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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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10 (pwm) LED anode
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Distributed as-is; no warranty is given.
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****************************************************************/
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#define PWM_LED_PIN 10
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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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// Global Variables
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APDS9930 apds = APDS9930();
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float ambient_light = 0; // can also be an unsigned long
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uint16_t ch0 = 0;
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uint16_t ch1 = 1;
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float max_light = 0;
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void setup() {
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//analogReference(EXTERNAL);
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pinMode(PWM_LED_PIN, OUTPUT);
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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 - Ambient light sensor"));
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Serial.println(F("--------------------------------"));
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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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// 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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#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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// Read the light levels (ambient, red, green, blue)
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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(F("Error reading light values"));
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} else {
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Serial.print(F("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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if ( ambient_light > max_light ) {
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max_light = ambient_light;
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}
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ambient_light = map(ambient_light, 0, max_light, 0, 1023);
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analogWrite(PWM_LED_PIN, ambient_light);
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}
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// Wait 1 second before next reading
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delay(50);
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}
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