89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
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#ifdef SENSOR_TCS34725
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//#include <Wire.h>
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//#include "Adafruit_TCS34725.h"
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#include "tcs34725_agc.h"
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//
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// Gain/time combinations to use and the min/max limits for hysteresis
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// that avoid saturation. They should be in order from dim to bright.
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//
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// Also set the first min count and the last max count to 0 to indicate
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// the start and end of the list.
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//
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const tcs34725::tcs_agc tcs34725::agc_lst[] = {
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{ TCS34725_GAIN_60X, TCS34725_INTEGRATIONTIME_700MS, 0, 20000 },
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{ TCS34725_GAIN_60X, TCS34725_INTEGRATIONTIME_154MS, 4990, 63000 },
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{ TCS34725_GAIN_16X, TCS34725_INTEGRATIONTIME_154MS, 16790, 63000 },
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{ TCS34725_GAIN_4X, TCS34725_INTEGRATIONTIME_154MS, 15740, 63000 },
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{ TCS34725_GAIN_1X, TCS34725_INTEGRATIONTIME_154MS, 15740, 0 }
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};
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tcs34725::tcs34725() : agc_cur(0), isAvailable(0), isSaturated(0) {
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}
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// initialize the sensor
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boolean tcs34725::begin(void) {
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tcs = Adafruit_TCS34725(agc_lst[agc_cur].at, agc_lst[agc_cur].ag);
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if ((isAvailable = tcs.begin()))
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setGainTime();
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return(isAvailable);
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}
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// Set the gain and integration time
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void tcs34725::setGainTime(void) {
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tcs.setGain(agc_lst[agc_cur].ag);
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tcs.setIntegrationTime(agc_lst[agc_cur].at);
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atime = int(agc_lst[agc_cur].at);
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atime_ms = ((256 - atime) * 2.4);
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switch(agc_lst[agc_cur].ag) {
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case TCS34725_GAIN_1X:
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againx = 1;
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break;
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case TCS34725_GAIN_4X:
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againx = 4;
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break;
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case TCS34725_GAIN_16X:
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againx = 16;
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break;
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case TCS34725_GAIN_60X:
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againx = 60;
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break;
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}
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}
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// Retrieve data from the sensor and do the calculations
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void tcs34725::getData(void) {
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// read the sensor and autorange if necessary
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tcs.getRawData(&r, &g, &b, &c);
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while(1) {
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if (agc_lst[agc_cur].maxcnt && c > agc_lst[agc_cur].maxcnt)
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agc_cur++;
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else if (agc_lst[agc_cur].mincnt && c < agc_lst[agc_cur].mincnt)
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agc_cur--;
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else break;
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setGainTime();
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delay((256 - atime) * 2.4 * 2); // shock absorber
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tcs.getRawData(&r, &g, &b, &c);
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break;
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}
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// DN40 calculations
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ir = (r + g + b > c) ? (r + g + b - c) / 2 : 0;
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r_comp = r - ir;
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g_comp = g - ir;
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b_comp = b - ir;
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c_comp = c - ir;
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cratio = float(ir) / float(c);
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saturation = ((256 - atime) > 63) ? 65535 : 1024 * (256 - atime);
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saturation75 = (atime_ms < 150) ? (saturation - saturation / 4) : saturation;
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isSaturated = (atime_ms < 150 && c > saturation75) ? 1 : 0;
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cpl = (atime_ms * againx) / (TCS34725_GA * TCS34725_DF);
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maxlux = 65535 / (cpl * 3);
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lux = (TCS34725_R_Coef * float(r_comp) + TCS34725_G_Coef * float(g_comp) + TCS34725_B_Coef * float(b_comp)) / cpl;
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ct = TCS34725_CT_Coef * float(b_comp) / float(r_comp) + TCS34725_CT_Offset;
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}
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#endif |