forked from adafruit/Adafruit-Raspberry-Pi-Python-Code
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathAdafruit_TCS34725.py
220 lines (173 loc) · 9.87 KB
/
Adafruit_TCS34725.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
#!/usr/bin/python
import time
from Adafruit_I2C import Adafruit_I2C
# ===========================================================================
# TCS3472 Class
# ===========================================================================
class TCS34725:
i2c = None
__TCS34725_ADDRESS = 0x29
__TCS34725_ID = 0x12 # 0x44 = TCS34721/TCS34725, 0x4D = TCS34723/TCS34727
__TCS34725_COMMAND_BIT = 0x80
__TCS34725_ENABLE = 0x00
__TCS34725_ENABLE_AIEN = 0x10 # RGBC Interrupt Enable
__TCS34725_ENABLE_WEN = 0x08 # Wait enable - Writing 1 activates the wait timer
__TCS34725_ENABLE_AEN = 0x02 # RGBC Enable - Writing 1 actives the ADC, 0 disables it
__TCS34725_ENABLE_PON = 0x01 # Power on - Writing 1 activates the internal oscillator, 0 disables it
__TCS34725_ATIME = 0x01 # Integration time
__TCS34725_WTIME = 0x03 # Wait time (if TCS34725_ENABLE_WEN is asserted)
__TCS34725_WTIME_2_4MS = 0xFF # WLONG0 = 2.4ms WLONG1 = 0.029s
__TCS34725_WTIME_204MS = 0xAB # WLONG0 = 204ms WLONG1 = 2.45s
__TCS34725_WTIME_614MS = 0x00 # WLONG0 = 614ms WLONG1 = 7.4s
__TCS34725_AILTL = 0x04 # Clear channel lower interrupt threshold
__TCS34725_AILTH = 0x05
__TCS34725_AIHTL = 0x06 # Clear channel upper interrupt threshold
__TCS34725_AIHTH = 0x07
__TCS34725_PERS = 0x0C # Persistence register - basic SW filtering mechanism for interrupts
__TCS34725_PERS_NONE = 0b0000 # Every RGBC cycle generates an interrupt
__TCS34725_PERS_1_CYCLE = 0b0001 # 1 clean channel value outside threshold range generates an interrupt
__TCS34725_PERS_2_CYCLE = 0b0010 # 2 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_3_CYCLE = 0b0011 # 3 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_5_CYCLE = 0b0100 # 5 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_10_CYCLE = 0b0101 # 10 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_15_CYCLE = 0b0110 # 15 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_20_CYCLE = 0b0111 # 20 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_25_CYCLE = 0b1000 # 25 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_30_CYCLE = 0b1001 # 30 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_35_CYCLE = 0b1010 # 35 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_40_CYCLE = 0b1011 # 40 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_45_CYCLE = 0b1100 # 45 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_50_CYCLE = 0b1101 # 50 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_55_CYCLE = 0b1110 # 55 clean channel values outside threshold range generates an interrupt
__TCS34725_PERS_60_CYCLE = 0b1111 # 60 clean channel values outside threshold range generates an interrupt
__TCS34725_CONFIG = 0x0D
__TCS34725_CONFIG_WLONG = 0x02 # Choose between short and long (12x) wait times via TCS34725_WTIME
__TCS34725_CONTROL = 0x0F # Set the gain level for the sensor
__TCS34725_ID = 0x12 # 0x44 = TCS34721/TCS34725, 0x4D = TCS34723/TCS34727
__TCS34725_STATUS = 0x13
__TCS34725_STATUS_AINT = 0x10 # RGBC Clean channel interrupt
__TCS34725_STATUS_AVALID = 0x01 # Indicates that the RGBC channels have completed an integration cycle
__TCS34725_CDATAL = 0x14 # Clear channel data
__TCS34725_CDATAH = 0x15
__TCS34725_RDATAL = 0x16 # Red channel data
__TCS34725_RDATAH = 0x17
__TCS34725_GDATAL = 0x18 # Green channel data
__TCS34725_GDATAH = 0x19
__TCS34725_BDATAL = 0x1A # Blue channel data
__TCS34725_BDATAH = 0x1B
__TCS34725_INTEGRATIONTIME_2_4MS = 0xFF # 2.4ms - 1 cycle - Max Count: 1024
__TCS34725_INTEGRATIONTIME_24MS = 0xF6 # 24ms - 10 cycles - Max Count: 10240
__TCS34725_INTEGRATIONTIME_50MS = 0xEB # 50ms - 20 cycles - Max Count: 20480
__TCS34725_INTEGRATIONTIME_101MS = 0xD5 # 101ms - 42 cycles - Max Count: 43008
__TCS34725_INTEGRATIONTIME_154MS = 0xC0 # 154ms - 64 cycles - Max Count: 65535
__TCS34725_INTEGRATIONTIME_700MS = 0x00 # 700ms - 256 cycles - Max Count: 65535
__TCS34725_GAIN_1X = 0x00 # No gain
__TCS34725_GAIN_4X = 0x01 # 2x gain
__TCS34725_GAIN_16X = 0x02 # 16x gain
__TCS34725_GAIN_60X = 0x03 # 60x gain
__integrationTimeDelay = {
0xFF: 0.0024, # 2.4ms - 1 cycle - Max Count: 1024
0xF6: 0.024, # 24ms - 10 cycles - Max Count: 10240
0xEB: 0.050, # 50ms - 20 cycles - Max Count: 20480
0xD5: 0.101, # 101ms - 42 cycles - Max Count: 43008
0xC0: 0.154, # 154ms - 64 cycles - Max Count: 65535
0x00: 0.700 # 700ms - 256 cycles - Max Count: 65535
}
# Private Methods
def __readU8(self, reg):
return self.i2c.readU8(self.__TCS34725_COMMAND_BIT | reg)
def __readU16Rev(self, reg):
return self.i2c.readU16Rev(self.__TCS34725_COMMAND_BIT | reg)
def __write8(self, reg, value):
self.i2c.write8(self.__TCS34725_COMMAND_BIT | reg, value & 0xff)
# Constructor
def __init__(self, address=0x29, debug=False, integrationTime=0xFF, gain=0x01):
self.i2c = Adafruit_I2C(address)
self.address = address
self.debug = debug
self.integrationTime = integrationTime
self.initialize(integrationTime, gain)
def initialize(self, integrationTime, gain):
"Initializes I2C and configures the sensor (call this function before \
doing anything else)"
# Make sure we're actually connected
result = self.__readU8(self.__TCS34725_ID)
if (result != 0x44):
return -1
# Set default integration time and gain
self.setIntegrationTime(integrationTime)
self.setGain(gain)
# Note: by default, the device is in power down mode on bootup
self.enable()
def enable(self):
self.__write8(self.__TCS34725_ENABLE, self.__TCS34725_ENABLE_PON)
time.sleep(0.01)
self.__write8(self.__TCS34725_ENABLE, (self.__TCS34725_ENABLE_PON | self.__TCS34725_ENABLE_AEN))
def disable(self):
reg = 0
reg = self.__readU8(self.__TCS34725_ENABLE)
self.__write8(self.__TCS34725_ENABLE, (reg & ~(self.__TCS34725_ENABLE_PON | self.__TCS34725_ENABLE_AEN)))
def setIntegrationTime(self, integrationTime):
"Sets the integration time for the TC34725"
self.integrationTime = integrationTime
self.__write8(self.__TCS34725_ATIME, integrationTime)
def getIntegrationTime(self):
return self.__readU8(self.__TCS34725_ATIME)
def setGain(self, gain):
"Adjusts the gain on the TCS34725 (adjusts the sensitivity to light)"
self.__write8(self.__TCS34725_CONTROL, gain)
def getGain(self):
return self.__readU8(self.__TCS34725_CONTROL)
def getRawData(self):
"Reads the raw red, green, blue and clear channel values"
color = {}
color["r"] = self.__readU16Rev(self.__TCS34725_RDATAL)
color["b"] = self.__readU16Rev(self.__TCS34725_BDATAL)
color["g"] = self.__readU16Rev(self.__TCS34725_GDATAL)
color["c"] = self.__readU16Rev(self.__TCS34725_CDATAL)
# Set a delay for the integration time
delay = self.__integrationTimeDelay.get(self.integrationTime)
time.sleep(delay)
return color
def setInterrupt(self, int):
r = self.__readU8(self.__TCS34725_ENABLE)
if (int):
r |= self.__TCS34725_ENABLE_AIEN
else:
r &= ~self.__TCS34725_ENABLE_AIEN
self.__write8(self.__TCS34725_ENABLE, r)
def clearInterrupt(self):
self.i2c.write8(0x66 & 0xff)
def setIntLimits(self, low, high):
self.i2c.write8(0x04, low & 0xFF)
self.i2c.write8(0x05, low >> 8)
self.i2c.write8(0x06, high & 0xFF)
self.i2c.write8(0x07, high >> 8)
#Static Utility Methods
@staticmethod
def calculateColorTemperature(rgb):
"Converts the raw R/G/B values to color temperature in degrees Kelvin"
if not isinstance(rgb, dict):
raise ValueError('calculateColorTemperature expects dict as parameter')
# 1. Map RGB values to their XYZ counterparts.
# Based on 6500K fluorescent, 3000K fluorescent
# and 60W incandescent values for a wide range.
# Note: Y = Illuminance or lux
X = (-0.14282 * rgb['r']) + (1.54924 * rgb['g']) + (-0.95641 * rgb['b'])
Y = (-0.32466 * rgb['r']) + (1.57837 * rgb['g']) + (-0.73191 * rgb['b'])
Z = (-0.68202 * rgb['r']) + (0.77073 * rgb['g']) + ( 0.56332 * rgb['b'])
# 2. Calculate the chromaticity co-ordinates
xc = (X) / (X + Y + Z)
yc = (Y) / (X + Y + Z)
# 3. Use McCamy's formula to determine the CCT
n = (xc - 0.3320) / (0.1858 - yc)
# Calculate the final CCT
cct = (449.0 * (n ** 3.0)) + (3525.0 *(n ** 2.0)) + (6823.3 * n) + 5520.33
return int(cct)
@staticmethod
def calculateLux(rgb):
"Converts the raw R/G/B values to color temperature in degrees Kelvin"
if not isinstance(rgb, dict):
raise ValueError('calculateLux expects dict as parameter')
illuminance = (-0.32466 * rgb['r']) + (1.57837 * rgb['g']) + (-0.73191 * rgb['b'])
return int(illuminance)