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https://github.com/KevinMidboe/Arduino.git
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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
// Sketch to explore the luminosity sensor TSL2561 (breakout board by Adafruit)
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#define SDA_PORT PORTD
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#define SDA_PIN 3
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#define SCL_PORT PORTD
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#define SCL_PIN 5
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#include <SoftI2CMaster.h>
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#include "TSL2561Soft.h"
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#define ADDR 0x72
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//------------------------------------------------------------------------------
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unsigned long computeLux(unsigned long channel0, unsigned long channel1){
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/* Make sure the sensor isn't saturated! */
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uint16_t clipThreshold = TSL2561_CLIPPING_402MS;;
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/* Return 0 lux if the sensor is saturated */
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if ((channel0 > clipThreshold) || (channel1 > clipThreshold))
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{
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Serial.println(F("Sensor is saturated"));
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return 32000;
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}
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/* Find the ratio of the channel values (Channel1/Channel0) */
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unsigned long ratio1 = 0;
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if (channel0 != 0) ratio1 = (channel1 << (TSL2561_LUX_RATIOSCALE+1)) / channel0;
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/* round the ratio value */
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unsigned long ratio = (ratio1 + 1) >> 1;
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unsigned int b, m;
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if ((ratio >= 0) && (ratio <= TSL2561_LUX_K1T))
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{b=TSL2561_LUX_B1T; m=TSL2561_LUX_M1T;}
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else if (ratio <= TSL2561_LUX_K2T)
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{b=TSL2561_LUX_B2T; m=TSL2561_LUX_M2T;}
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else if (ratio <= TSL2561_LUX_K3T)
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{b=TSL2561_LUX_B3T; m=TSL2561_LUX_M3T;}
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else if (ratio <= TSL2561_LUX_K4T)
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{b=TSL2561_LUX_B4T; m=TSL2561_LUX_M4T;}
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else if (ratio <= TSL2561_LUX_K5T)
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{b=TSL2561_LUX_B5T; m=TSL2561_LUX_M5T;}
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else if (ratio <= TSL2561_LUX_K6T)
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{b=TSL2561_LUX_B6T; m=TSL2561_LUX_M6T;}
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else if (ratio <= TSL2561_LUX_K7T)
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{b=TSL2561_LUX_B7T; m=TSL2561_LUX_M7T;}
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else if (ratio > TSL2561_LUX_K8T)
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{b=TSL2561_LUX_B8T; m=TSL2561_LUX_M8T;}
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unsigned long temp;
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temp = ((channel0 * b) - (channel1 * m));
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/* Do not allow negative lux value */
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if (temp < 0) temp = 0;
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/* Round lsb (2^(LUX_SCALE-1)) */
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temp += (1 << (TSL2561_LUX_LUXSCALE-1));
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/* Strip off fractional portion */
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uint32_t lux = temp >> TSL2561_LUX_LUXSCALE;
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return lux;
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}
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void setup(void) {
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Serial.begin(19200);
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Serial.println("Initializing ...");
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i2c_init();
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if (!i2c_start(ADDR | I2C_WRITE)) Serial.println(F("Device does not respond"));
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if (!i2c_write(0x80)) Serial.println(F("Cannot address reg 0"));
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if (!i2c_write(0x03)) Serial.println(F("Cannot wake up"));
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i2c_stop();
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}
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void loop (void) {
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unsigned int low0, high0, low1, high1;
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unsigned int chan0, chan1;
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unsigned int lux;
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delay(1000);
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i2c_start(ADDR | I2C_WRITE);
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i2c_write(0x8C);
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i2c_rep_start(ADDR | I2C_READ);
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low0 = i2c_read(false);
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high0 = i2c_read(false);
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low1 = i2c_read(false);
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high1 = i2c_read(true);
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i2c_stop();
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Serial.print(F("Raw values: chan0="));
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Serial.print(chan0=(low0+(high0<<8)));
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Serial.print(F(" / chan1="));
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Serial.println(chan1=(low1+(high1<<8)));
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lux = computeLux(chan0,chan1);
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Serial.print(F("Lux value="));
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Serial.println(lux);
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}
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