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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
|
# Obtain temperature using linear interpolation of ADC values
#
# Copyright (C) 2016-2024 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging, bisect
######################################################################
# Interface between MCU adc and heater temperature callbacks
######################################################################
SAMPLE_TIME = 0.001
SAMPLE_COUNT = 8
REPORT_TIME = 0.300
RANGE_CHECK_COUNT = 4
# Interface between ADC and heater temperature callbacks
class PrinterADCtoTemperature:
def __init__(self, config, adc_convert):
self.adc_convert = adc_convert
ppins = config.get_printer().lookup_object('pins')
self.mcu_adc = ppins.setup_pin('adc', config.get('sensor_pin'))
self.mcu_adc.setup_adc_callback(REPORT_TIME, self.adc_callback)
self.diag_helper = HelperTemperatureDiagnostics(
config, self.mcu_adc, adc_convert.calc_temp)
def setup_callback(self, temperature_callback):
self.temperature_callback = temperature_callback
def get_report_time_delta(self):
return REPORT_TIME
def adc_callback(self, read_time, read_value):
temp = self.adc_convert.calc_temp(read_value)
self.temperature_callback(read_time + SAMPLE_COUNT * SAMPLE_TIME, temp)
def setup_minmax(self, min_temp, max_temp):
arange = [self.adc_convert.calc_adc(t) for t in [min_temp, max_temp]]
min_adc, max_adc = sorted(arange)
self.mcu_adc.setup_adc_sample(SAMPLE_TIME, SAMPLE_COUNT,
minval=min_adc, maxval=max_adc,
range_check_count=RANGE_CHECK_COUNT)
self.diag_helper.setup_diag_minmax(min_temp, max_temp, min_adc, max_adc)
# Tool to register with query_adc and report extra info on ADC range errors
class HelperTemperatureDiagnostics:
def __init__(self, config, mcu_adc, calc_temp_cb):
self.printer = config.get_printer()
self.name = config.get_name()
self.mcu_adc = mcu_adc
self.calc_temp_cb = calc_temp_cb
self.min_temp = self.max_temp = self.min_adc = self.max_adc = None
query_adc = self.printer.load_object(config, 'query_adc')
query_adc.register_adc(self.name, self.mcu_adc)
error_mcu = self.printer.load_object(config, 'error_mcu')
error_mcu.add_clarify("ADC out of range", self._clarify_adc_range)
def setup_diag_minmax(self, min_temp, max_temp, min_adc, max_adc):
self.min_temp, self.max_temp = min_temp, max_temp
self.min_adc, self.max_adc = min_adc, max_adc
def _clarify_adc_range(self, msg, details):
if self.min_temp is None:
return None
last_value, last_read_time = self.mcu_adc.get_last_value()
if not last_read_time:
return None
if last_value >= self.min_adc and last_value <= self.max_adc:
return None
tempstr = "?"
try:
last_temp = self.calc_temp_cb(last_value)
tempstr = "%.3f" % (last_temp,)
except e:
logging.exception("Error in calc_temp callback")
return ("Sensor '%s' temperature %s not in range %.3f:%.3f"
% (self.name, tempstr, self.min_temp, self.max_temp))
######################################################################
# Linear interpolation
######################################################################
# Helper code to perform linear interpolation
class LinearInterpolate:
def __init__(self, samples):
self.keys = []
self.slopes = []
last_key = last_value = None
for key, value in sorted(samples):
if last_key is None:
last_key = key
last_value = value
continue
if key <= last_key:
raise ValueError("duplicate value")
gain = (value - last_value) / (key - last_key)
offset = last_value - last_key * gain
if self.slopes and self.slopes[-1] == (gain, offset):
continue
last_value = value
last_key = key
self.keys.append(key)
self.slopes.append((gain, offset))
if not self.keys:
raise ValueError("need at least two samples")
self.keys.append(9999999999999.)
self.slopes.append(self.slopes[-1])
def interpolate(self, key):
pos = bisect.bisect(self.keys, key)
gain, offset = self.slopes[pos]
return key * gain + offset
def reverse_interpolate(self, value):
values = [key * gain + offset for key, (gain, offset) in zip(
self.keys, self.slopes)]
if values[0] < values[-2]:
valid = [i for i in range(len(values)) if values[i] >= value]
else:
valid = [i for i in range(len(values)) if values[i] <= value]
gain, offset = self.slopes[min(valid + [len(values) - 1])]
return (value - offset) / gain
######################################################################
# Linear voltage to temperature converter
######################################################################
# Linear style conversion chips calibrated from temperature measurements
class LinearVoltage:
def __init__(self, config, params):
adc_voltage = config.getfloat('adc_voltage', 5., above=0.)
voltage_offset = config.getfloat('voltage_offset', 0.0)
samples = []
for temp, volt in params:
adc = (volt - voltage_offset) / adc_voltage
if adc < 0. or adc > 1.:
logging.warning("Ignoring adc sample %.3f/%.3f in heater %s",
temp, volt, config.get_name())
continue
samples.append((adc, temp))
try:
li = LinearInterpolate(samples)
except ValueError as e:
raise config.error("adc_temperature %s in heater %s" % (
str(e), config.get_name()))
self.calc_temp = li.interpolate
self.calc_adc = li.reverse_interpolate
# Custom defined sensors from the config file
class CustomLinearVoltage:
def __init__(self, config):
self.name = " ".join(config.get_name().split()[1:])
self.params = []
for i in range(1, 1000):
t = config.getfloat("temperature%d" % (i,), None)
if t is None:
break
v = config.getfloat("voltage%d" % (i,))
self.params.append((t, v))
def create(self, config):
lv = LinearVoltage(config, self.params)
return PrinterADCtoTemperature(config, lv)
######################################################################
# Linear resistance to temperature converter
######################################################################
# Linear resistance calibrated from temperature measurements
class LinearResistance:
def __init__(self, config, samples):
self.pullup = config.getfloat('pullup_resistor', 4700., above=0.)
try:
self.li = LinearInterpolate([(r, t) for t, r in samples])
except ValueError as e:
raise config.error("adc_temperature %s in heater %s" % (
str(e), config.get_name()))
def calc_temp(self, adc):
# Calculate temperature from adc
adc = max(.00001, min(.99999, adc))
r = self.pullup * adc / (1.0 - adc)
return self.li.interpolate(r)
def calc_adc(self, temp):
# Calculate adc reading from a temperature
r = self.li.reverse_interpolate(temp)
return r / (self.pullup + r)
# Custom defined sensors from the config file
class CustomLinearResistance:
def __init__(self, config):
self.name = " ".join(config.get_name().split()[1:])
self.samples = []
for i in range(1, 1000):
t = config.getfloat("temperature%d" % (i,), None)
if t is None:
break
r = config.getfloat("resistance%d" % (i,))
self.samples.append((t, r))
def create(self, config):
lr = LinearResistance(config, self.samples)
return PrinterADCtoTemperature(config, lr)
######################################################################
# Default sensors
######################################################################
AD595 = [
(0., .0027), (10., .101), (20., .200), (25., .250), (30., .300),
(40., .401), (50., .503), (60., .605), (80., .810), (100., 1.015),
(120., 1.219), (140., 1.420), (160., 1.620), (180., 1.817), (200., 2.015),
(220., 2.213), (240., 2.413), (260., 2.614), (280., 2.817), (300., 3.022),
(320., 3.227), (340., 3.434), (360., 3.641), (380., 3.849), (400., 4.057),
(420., 4.266), (440., 4.476), (460., 4.686), (480., 4.896)
]
AD597 = [
(0., 0.), (10., .097), (20., .196), (25., .245), (30., .295),
(40., 0.395), (50., 0.496), (60., 0.598), (80., 0.802), (100., 1.005),
(120., 1.207), (140., 1.407), (160., 1.605), (180., 1.801), (200., 1.997),
(220., 2.194), (240., 2.392), (260., 2.592), (280., 2.794), (300., 2.996),
(320., 3.201), (340., 3.406), (360., 3.611), (380., 3.817), (400., 4.024),
(420., 4.232), (440., 4.440), (460., 4.649), (480., 4.857), (500., 5.066)
]
AD8494 = [
(-180, -0.714), (-160, -0.658), (-140, -0.594), (-120, -0.523),
(-100, -0.446), (-80, -0.365), (-60, -0.278), (-40, -0.188),
(-20, -0.095), (0, 0.002), (20, 0.1), (25, 0.125), (40, 0.201),
(60, 0.303), (80, 0.406), (100, 0.511), (120, 0.617), (140, 0.723),
(160, 0.829), (180, 0.937), (200, 1.044), (220, 1.151), (240, 1.259),
(260, 1.366), (280, 1.473), (300, 1.58), (320, 1.687), (340, 1.794),
(360, 1.901), (380, 2.008), (400, 2.114), (420, 2.221), (440, 2.328),
(460, 2.435), (480, 2.542), (500, 2.65), (520, 2.759), (540, 2.868),
(560, 2.979), (580, 3.09), (600, 3.203), (620, 3.316), (640, 3.431),
(660, 3.548), (680, 3.666), (700, 3.786), (720, 3.906), (740, 4.029),
(760, 4.152), (780, 4.276), (800, 4.401), (820, 4.526), (840, 4.65),
(860, 4.774), (880, 4.897), (900, 5.018), (920, 5.138), (940, 5.257),
(960, 5.374), (980, 5.49), (1000, 5.606), (1020, 5.72), (1040, 5.833),
(1060, 5.946), (1080, 6.058), (1100, 6.17), (1120, 6.282), (1140, 6.394),
(1160, 6.505), (1180, 6.616), (1200, 6.727)
]
AD8495 = [
(-260, -0.786), (-240, -0.774), (-220, -0.751), (-200, -0.719),
(-180, -0.677), (-160, -0.627), (-140, -0.569), (-120, -0.504),
(-100, -0.432), (-80, -0.355), (-60, -0.272), (-40, -0.184), (-20, -0.093),
(0, 0.003), (20, 0.1), (25, 0.125), (40, 0.2), (60, 0.301), (80, 0.402),
(100, 0.504), (120, 0.605), (140, 0.705), (160, 0.803), (180, 0.901),
(200, 0.999), (220, 1.097), (240, 1.196), (260, 1.295), (280, 1.396),
(300, 1.497), (320, 1.599), (340, 1.701), (360, 1.803), (380, 1.906),
(400, 2.01), (420, 2.113), (440, 2.217), (460, 2.321), (480, 2.425),
(500, 2.529), (520, 2.634), (540, 2.738), (560, 2.843), (580, 2.947),
(600, 3.051), (620, 3.155), (640, 3.259), (660, 3.362), (680, 3.465),
(700, 3.568), (720, 3.67), (740, 3.772), (760, 3.874), (780, 3.975),
(800, 4.076), (820, 4.176), (840, 4.275), (860, 4.374), (880, 4.473),
(900, 4.571), (920, 4.669), (940, 4.766), (960, 4.863), (980, 4.959),
(1000, 5.055), (1020, 5.15), (1040, 5.245), (1060, 5.339), (1080, 5.432),
(1100, 5.525), (1120, 5.617), (1140, 5.709), (1160, 5.8), (1180, 5.891),
(1200, 5.98), (1220, 6.069), (1240, 6.158), (1260, 6.245), (1280, 6.332),
(1300, 6.418), (1320, 6.503), (1340, 6.587), (1360, 6.671), (1380, 6.754)
]
AD8496 = [
(-180, -0.642), (-160, -0.59), (-140, -0.53), (-120, -0.464),
(-100, -0.392), (-80, -0.315), (-60, -0.235), (-40, -0.15), (-20, -0.063),
(0, 0.027), (20, 0.119), (25, 0.142), (40, 0.213), (60, 0.308),
(80, 0.405), (100, 0.503), (120, 0.601), (140, 0.701), (160, 0.8),
(180, 0.9), (200, 1.001), (220, 1.101), (240, 1.201), (260, 1.302),
(280, 1.402), (300, 1.502), (320, 1.602), (340, 1.702), (360, 1.801),
(380, 1.901), (400, 2.001), (420, 2.1), (440, 2.2), (460, 2.3),
(480, 2.401), (500, 2.502), (520, 2.603), (540, 2.705), (560, 2.808),
(580, 2.912), (600, 3.017), (620, 3.124), (640, 3.231), (660, 3.34),
(680, 3.451), (700, 3.562), (720, 3.675), (740, 3.789), (760, 3.904),
(780, 4.02), (800, 4.137), (820, 4.254), (840, 4.37), (860, 4.486),
(880, 4.6), (900, 4.714), (920, 4.826), (940, 4.937), (960, 5.047),
(980, 5.155), (1000, 5.263), (1020, 5.369), (1040, 5.475), (1060, 5.581),
(1080, 5.686), (1100, 5.79), (1120, 5.895), (1140, 5.999), (1160, 6.103),
(1180, 6.207), (1200, 6.311)
]
AD8497 = [
(-260, -0.785), (-240, -0.773), (-220, -0.751), (-200, -0.718),
(-180, -0.676), (-160, -0.626), (-140, -0.568), (-120, -0.503),
(-100, -0.432), (-80, -0.354), (-60, -0.271), (-40, -0.184),
(-20, -0.092), (0, 0.003), (20, 0.101), (25, 0.126), (40, 0.2),
(60, 0.301), (80, 0.403), (100, 0.505), (120, 0.605), (140, 0.705),
(160, 0.804), (180, 0.902), (200, 0.999), (220, 1.097), (240, 1.196),
(260, 1.296), (280, 1.396), (300, 1.498), (320, 1.599), (340, 1.701),
(360, 1.804), (380, 1.907), (400, 2.01), (420, 2.114), (440, 2.218),
(460, 2.322), (480, 2.426), (500, 2.53), (520, 2.634), (540, 2.739),
(560, 2.843), (580, 2.948), (600, 3.052), (620, 3.156), (640, 3.259),
(660, 3.363), (680, 3.466), (700, 3.569), (720, 3.671), (740, 3.773),
(760, 3.874), (780, 3.976), (800, 4.076), (820, 4.176), (840, 4.276),
(860, 4.375), (880, 4.474), (900, 4.572), (920, 4.67), (940, 4.767),
(960, 4.863), (980, 4.96), (1000, 5.055), (1020, 5.151), (1040, 5.245),
(1060, 5.339), (1080, 5.433), (1100, 5.526), (1120, 5.618), (1140, 5.71),
(1160, 5.801), (1180, 5.891), (1200, 5.981), (1220, 6.07), (1240, 6.158),
(1260, 6.246), (1280, 6.332), (1300, 6.418), (1320, 6.503), (1340, 6.588),
(1360, 6.671), (1380, 6.754)
]
def calc_pt100(base=100.):
# Calc PT100/PT1000 resistances using Callendar-Van Dusen formula
A, B = (3.9083e-3, -5.775e-7)
return [(float(t), base * (1. + A*t + B*t*t)) for t in range(0, 500, 10)]
def calc_ina826_pt100():
# Standard circuit is 4400ohm pullup with 10x gain to 5V
return [(t, 10. * 5. * r / (4400. + r)) for t, r in calc_pt100()]
DefaultVoltageSensors = [
("AD595", AD595), ("AD597", AD597), ("AD8494", AD8494), ("AD8495", AD8495),
("AD8496", AD8496), ("AD8497", AD8497),
("PT100 INA826", calc_ina826_pt100())
]
DefaultResistanceSensors = [
("PT1000", calc_pt100(1000.))
]
def load_config(config):
# Register default sensors
pheaters = config.get_printer().load_object(config, "heaters")
for sensor_type, params in DefaultVoltageSensors:
func = (lambda config, params=params:
PrinterADCtoTemperature(config, LinearVoltage(config, params)))
pheaters.add_sensor_factory(sensor_type, func)
for sensor_type, params in DefaultResistanceSensors:
func = (lambda config, params=params:
PrinterADCtoTemperature(config,
LinearResistance(config, params)))
pheaters.add_sensor_factory(sensor_type, func)
def load_config_prefix(config):
if config.get("resistance1", None) is None:
custom_sensor = CustomLinearVoltage(config)
else:
custom_sensor = CustomLinearResistance(config)
pheaters = config.get_printer().load_object(config, "heaters")
pheaters.add_sensor_factory(custom_sensor.name, custom_sensor.create)
|
