1 | /*
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2 | * Digital_Light_TSL2561.cpp
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3 | * A library for TSL2561
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4 | *
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5 | * Copyright (c) 2012 seeed technology inc.
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6 | * Website : www.seeed.cc
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7 | * Author : zhangkun
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8 | * Create Time:
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9 | * Change Log : Jack Shao, Nov 2014, bug fix and update for user experience
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10 | *
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11 | * The MIT License (MIT)
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12 | *
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13 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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14 | * of this software and associated documentation files (the "Software"), to deal
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15 | * in the Software without restriction, including without limitation the rights
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16 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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17 | * copies of the Software, and to permit persons to whom the Software is
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18 | * furnished to do so, subject to the following conditions:
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19 | *
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20 | * The above copyright notice and this permission notice shall be included in
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21 | * all copies or substantial portions of the Software.
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22 | *
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23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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28 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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29 | * THE SOFTWARE.
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30 | */
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31 | #include <Digital_Light_TSL2561.h>
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32 | #include <Arduino.h>
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33 | #include <Wire.h>
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34 | uint8_t TSL2561_CalculateLux::readRegister(int deviceAddress, int address)
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35 | {
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36 |
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37 | uint8_t value;
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38 | Wire.beginTransmission(deviceAddress);
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39 | Wire.write(address); // register to read
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40 | Wire.endTransmission();
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41 | Wire.requestFrom(deviceAddress, 1); // read a byte
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42 | while(!Wire.available());
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43 | value = Wire.read();
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44 | //delay(100);
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45 | return value;
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46 | }
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47 |
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48 | void TSL2561_CalculateLux::writeRegister(int deviceAddress, int address, uint8_t val)
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49 | {
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50 | Wire.beginTransmission(deviceAddress); // start transmission to device
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51 | Wire.write(address); // send register address
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52 | Wire.write(val); // send value to write
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53 | Wire.endTransmission(); // end transmission
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54 | //delay(100);
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55 | }
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56 | void TSL2561_CalculateLux::getLux(void)
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57 | {
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58 | CH0_LOW=readRegister(TSL2561_Address,TSL2561_Channal0L);
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59 | CH0_HIGH=readRegister(TSL2561_Address,TSL2561_Channal0H);
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60 | //read two bytes from registers 0x0E and 0x0F
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61 | CH1_LOW=readRegister(TSL2561_Address,TSL2561_Channal1L);
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62 | CH1_HIGH=readRegister(TSL2561_Address,TSL2561_Channal1H);
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63 |
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64 | ch0 = (CH0_HIGH<<8) | CH0_LOW;
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65 | ch1 = (CH1_HIGH<<8) | CH1_LOW;
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66 | }
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67 | void TSL2561_CalculateLux::init()
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68 | {
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69 | writeRegister(TSL2561_Address,TSL2561_Control,0x03); // POWER UP
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70 | writeRegister(TSL2561_Address,TSL2561_Timing,0x00); //No High Gain (1x), integration time of 13ms
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71 | writeRegister(TSL2561_Address,TSL2561_Interrupt,0x00);
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72 | writeRegister(TSL2561_Address,TSL2561_Control,0x00); // POWER Down
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73 | }
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74 | signed long TSL2561_CalculateLux::readVisibleLux()
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75 | {
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76 | writeRegister(TSL2561_Address,TSL2561_Control,0x03); // POWER UP
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77 | delay(14);
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78 | getLux();
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79 |
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80 | writeRegister(TSL2561_Address,TSL2561_Control,0x00); // POWER Down
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81 | if(ch0/ch1 < 2 && ch0 > 4900)
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82 | {
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83 | return -1; //ch0 out of range, but ch1 not. the lux is not valid in this situation.
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84 | }
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85 | return calculateLux(0, 0, 0); //T package, no gain, 13ms
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86 | }
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87 | unsigned long TSL2561_CalculateLux::calculateLux(unsigned int iGain, unsigned int tInt,int iType)
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88 | {
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89 | switch (tInt)
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90 | {
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91 | case 0: // 13.7 msec
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92 | chScale = CHSCALE_TINT0;
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93 | break;
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94 | case 1: // 101 msec
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95 | chScale = CHSCALE_TINT1;
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96 | break;
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97 | default: // assume no scaling
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98 | chScale = (1 << CH_SCALE);
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99 | break;
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100 | }
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101 | if (!iGain) chScale = chScale << 4; // scale 1X to 16X
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102 | // scale the channel values
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103 | channel0 = (ch0 * chScale) >> CH_SCALE;
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104 | channel1 = (ch1 * chScale) >> CH_SCALE;
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105 |
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106 | ratio1 = 0;
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107 | if (channel0!= 0) ratio1 = (channel1 << (RATIO_SCALE+1))/channel0;
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108 | // round the ratio value
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109 | unsigned long ratio = (ratio1 + 1) >> 1;
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110 |
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111 | switch (iType)
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112 | {
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113 | case 0: // T package
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114 | if ((ratio >= 0) && (ratio <= K1T))
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115 | {b=B1T; m=M1T;}
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116 | else if (ratio <= K2T)
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117 | {b=B2T; m=M2T;}
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118 | else if (ratio <= K3T)
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119 | {b=B3T; m=M3T;}
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120 | else if (ratio <= K4T)
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121 | {b=B4T; m=M4T;}
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122 | else if (ratio <= K5T)
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123 | {b=B5T; m=M5T;}
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124 | else if (ratio <= K6T)
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125 | {b=B6T; m=M6T;}
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126 | else if (ratio <= K7T)
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127 | {b=B7T; m=M7T;}
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128 | else if (ratio > K8T)
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129 | {b=B8T; m=M8T;}
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130 | break;
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131 | case 1:// CS package
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132 | if ((ratio >= 0) && (ratio <= K1C))
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133 | {b=B1C; m=M1C;}
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134 | else if (ratio <= K2C)
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135 | {b=B2C; m=M2C;}
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136 | else if (ratio <= K3C)
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137 | {b=B3C; m=M3C;}
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138 | else if (ratio <= K4C)
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139 | {b=B4C; m=M4C;}
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140 | else if (ratio <= K5C)
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141 | {b=B5C; m=M5C;}
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142 | else if (ratio <= K6C)
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143 | {b=B6C; m=M6C;}
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144 | else if (ratio <= K7C)
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145 | {b=B7C; m=M7C;}
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146 | }
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147 | temp=((channel0*b)-(channel1*m));
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148 | if(temp<0) temp=0;
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149 | temp+=(1<<(LUX_SCALE-1));
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150 | // strip off fractional portion
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151 | lux=temp>>LUX_SCALE;
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152 | return (lux);
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153 | }
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154 | TSL2561_CalculateLux TSL2561;
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155 |
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156 |
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