forked from BrucesHobbies/radonMaster
-
Notifications
You must be signed in to change notification settings - Fork 0
/
sensorHnyAbp.py
366 lines (276 loc) · 13 KB
/
sensorHnyAbp.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
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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
#!/usr/bin/env python
"""
Copyright(C) 2020, BrucesHobbies
All Rights Reserved
AUTHOR: Bruce
DATE: 12/1/2020
REVISION HISTORY
DATE AUTHOR CHANGES
yyyy/mm/dd --------------- -------------------------------------
2021/03/01 BrucesHobbies Fixed exception logic in readAbp()'s
OVERVIEW:
Read and calculate pressure optional with temperature from Honeywell ABP series pressure sensor
(High Accuracy, Compensated/Amplified, 60 mbar to 10 bar | 6kPa to 1 MPa | 1 psi to 150 psi,
Liquid Media Capable)
LICENSE:
This program code and documentation are for personal private use only.
No commercial use of this code is allowed without prior written consent.
This program is free for you to inspect, study, and modify for your
personal private use.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
GENERAL INFORMATION:
Debug print can be commented in or out.
Each sensor is either I2C or SPI, but not both.
RASPBERRY PI I2C PINS to ABP PRESSURE SENSOR (4-wires):
RPI 40-pin ABP (From Table 8 in Data Sheet)
Pin 1 (+3.3 VDC) = Pin 2 (+3.3 Vsupply)
Pin 3 (SDA1) = Pin 5 (SDA)
Pin 5 (SCL1) = Pin 6 (SCL)
Pin 6 (GND) = Pin 1 (GND)
RASPBERRY PI SPI PINS to ABP PRESSURE SENSOR (5-wires):
RPI 40-pin ABP (From Table 8 in Data Sheet)
Pin 17 (+3.3 VDC) = Pin 2 (+3.3 Vsupply)
Pin 21 (SPI_MISO) = Pin 5 (MISO)
Pin 23 (SPI_CLK) = Pin 6 (SCLK)
Pin 24 (SPI_CE0_N) = Pin 3 (SS)
Pin 25 (GND) = Pin 1 (GND)
PACKAGES REQUIRED:
sudo apt-get install python3-smbus # I2C
Use RASPI Config to enable I2C and SPI buses.
# https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md
Commands to display if SPI is enabled on Raspberry PI OS
ls /dev/*spi* # Response should be: /dev/spidev0.0 /dev/spidev0.1
Commands to display I2C addresses in use from connected hardware on Raspberry PI OS:
sudo i2cdetect -y 0
sudo i2cdetect -y 1
--- OVERVIEW ----------------------------------------------------------------------------
https://sensing.honeywell.com/
Sensors available from these distributors: Arrow, Digikey, and Mouser
Decodes sensor type from:
Basic Board Mount Pressure Sensors, ABP Series, 32305128 Issue E
Figure 4: Nomenclature and Order Guide
Remove Product series, package, pressure port, and option prefix before passing string to function.
Remove transfer function and supply voltage suffix before passing string to function.
Example 1: ABPMANN001PDSA3 which is a 0 - 1 psi differential 3.3VDC pressure sensor use "001PDS"
Example 2: ABPDANN060MG2A3 which is a 0 - 60 mbar gage 3.3VDC pressure sensor use "060PG2"
Additional examples:
ABPDRRT005PG2A5 ABP D RR T 005PG 2 A 5 "005PG2"
ABPMRRV001PD2A3 ABP M RR V 001PD 2 A 3 "001PD2"
ABPMRRV060MG2A3 ABP M RR V 060MG 2 A 3 "060MG2"
ABPDRRV001PDAA5 ABP D RR V 001PD A A 5 "001PDA"
ABPDRRV001PDSA3 ABP D RR V 001PD S A 3 "001PDS"
ABPDRRV060MGSA3 ABP D RR V 060MG S A 3 "060MGS"
| | | | | || | | | | ||+------> Output type (S|1-7)
| | | | | || | | | | |+-------> Differential | Gage
| | | | | || | | | | +--------> Units: mbar, bar, kPa, MPa, psi
| | | | | || | | | +-----------> Range
| | | | | || | | +-> Supply voltage
| | | | | || | +---> Transfer function
| | | | | || +-----> Output type (S|1-7)
| | | | | |+-------> Differential | Gage
| | | | | +--------> Units: mbar, bar, kPa, MPa, psi
| | | | +-----------> Range
| | | +-------------> Option: N, D, T, V
| | +----------------> Pressure port
| +------------------> Package: D=DIP, M=SMT, L=Leadless SMT
+----------------------> Product series: Amplified Basic Pressure
"""
import sys
import time
import smbus # I2C support
import spidev # SPI support
class SensorHnyAbp :
def __init__(self, sensor) :
# ABP sensor Analog Digital Converter
self.OUTPUT_MAX = 14745 # 2^14 counts at 90% - maximum
self.OUTPUT_MIN = 1638 # 2^14 counts at 10% - minimum
# ABP sensor pressure range as floats
self.PRESSURE_MAX = 60.0 # at output maximum
self.PRESSURE_MIN = 0.0 # at output minimum
# ABP pressure units and type
self.PRESS_UNITS = "psi"
self.PRESS_SENSOR = "diff"
self.i2c_address = 0x28 # ABP sensor address on the I2C bus
print("ABP sensor: " + sensor)
if len(sensor)!=6 :
print("Error in sensor selection!")
return
# RANGE
range = float(sensor[:3])
if range<1 or range>600 :
print("Error in pressure range!")
return
self.PRESSURE_MAX = float(range)
self.PRESSURE_MIN = 0.0
# UNITS
if sensor[3]=="M" :
self.PRES_UNITS = "mbar"
self.__conv2inchwc = 0.401865
elif sensor[3]=="B" :
self.PRES_UNITS = "bar"
self.__conv2inchwc = 401.865
elif sensor[3]=="K" :
self.PRES_UNITS = "kPa"
self.__conv2inchwc = 4.01865
elif sensor[3]=="G" :
self.PRES_UNITS = "mPa"
self.__conv2inchwc = 4018.65
elif sensor[3]=="P" :
self.PRES_UNITS = "psi"
self.__conv2inchwc = 27.679904842545
else :
print("Error in pressure range units!")
self.__conv2inchwc = 0.0
# diff|gage
if sensor[4]=="D" :
self.PRESS_SENSOR = "diff"
self.PRESSURE_MIN = -self.PRESSURE_MAX
elif sensor[4]=="G" :
self.PRESS_SENSOR = "gage"
else :
print("Error in diff|gage type!")
# SPI or I2C address
if sensor[5]=="S" :
self.i2c_address = 0 # i2c_address==0 indicates SPI for us
else :
i2c_addr = int(sensor[5])
if (i2c_addr > 0) and (i2c_addr < 8) :
self.i2c_address = (i2c_addr << 4) + 0x08
else :
print("Error in i2c address!") # self.i2c_address remains unchanged
if self.i2c_address :
addr = " i2c address: " + hex(self.i2c_address)
else :
addr = " SPI"
print("Range: " + str(round(self.PRESSURE_MIN,1)) + " to " + str(round(self.PRESSURE_MAX,1)) + " " + self.PRES_UNITS + " " + self.PRESS_SENSOR + addr)
# initialize appropriate bus
if self.i2c_address :
i2c_ch = 1 # i2c channel
self.bus=smbus.SMBus(i2c_ch) # Initialize I2C (SMBus)
else :
self.spi = spidev.SpiDev() # Initialize SPI bus
bus = 0
device = 0 # Chip select pin: Set to 0 or 1
self.spi.open(bus, device) # Open SPI bus
self.spi.max_speed_hz = 500000
self.spi.mode = 0
def __del__(self) : # del Abp pressure sensor
if self.i2c_address :
self.bus.close()
else :
self.spi.close()
def __cnts2pres(self, dataBlk) :
# converts 2 bytes to return scaled floating point
# print("dataBlk[0]: " + hex(dataBlk[0]) + " dataBlk[1]: " + hex(dataBlk[1]))
ans = ((dataBlk[0] & 0x003F) << 8) + (dataBlk[1] & 0x00ff)
# calculation of PSI value per Honeywell Technical Note
return ((ans-self.OUTPUT_MIN) * (self.PRESSURE_MAX-self.PRESSURE_MIN) / (self.OUTPUT_MAX-self.OUTPUT_MIN)) + self.PRESSURE_MIN
def __cnts2tempC(self, dataBlk) :
# converts 2 bytes to return scaled floating point
tempC = (dataBlk[2] << 3) + ((dataBlk[3] & 0xE0) >> 5)
# calculation of temperature per Honeywell Technical Note
# Temperature output may be uncompensated depending on part number
return (tempC * 200.0 / 2047.0) - 50.0
def __statusDecode(statusCode) :
""" Status bits
0 = normal operation, valid data
1 = device in command mode
2 = stale data
3 = diagnostic condition
"""
return
# Reads the I2C pressure sensor returning pressure only
def readAbp(self):
try :
if self.i2c_address :
result = self.bus.read_i2c_block_data(self.i2c_address, 0, 2) # send address with read bit and returns 2 bytes
else :
result = self.spi.readbytes(2)
pressure = self.__cnts2pres(result)
except :
pressure = None
return pressure
# Reads the I2C pressure sensor and also returns status
def readAbpStatus(self):
try :
if self.i2c_address :
result = self.bus.read_i2c_block_data(self.i2c_address, 0, 2) # send address with read bit and returns 2 bytes
else :
result = self.spi.readbytes(2)
status = (result[0] & 0xC0) >> 6
pressure = self.__cnts2pres(result)
except :
status = None
pressure = None
return status, pressure
# Reads the I2C pressure sensor and also returns status and temp
def readAbpStatusTemp(self):
try :
if self.i2c_address :
result = self.bus.read_i2c_block_data(self.i2c_address, 0, 4) # send address with read bit and returns 4 bytes
else :
result = self.spi.readbytes(4)
status = (result[0] & 0xC0) >> 6
pressure = self.__cnts2pres(result)
tempC = self.__cnts2tempC(result)
except :
status = None
pressure = None
tempC = None
return status, pressure, tempC
""" Conversions (need to verify temperature assumptions for inches of water column)
1 PSI = 27.679904842545 inches water column at 4 deg C or 39.2 deg F (international standard)
1" WC = 0.03612729182735355 PSI
1 PSI = 27.70759 inches water column at 60 deg F (industry practice)
1" WC = 0.030609 PSI
1 mbar = 0.401865 inches water column
1" WC = 2.490889083333 mbar
1 mbar = 100 Pascals
1 kPa = 1000 Pascals
1 kPa = 10 mbar
1" WC = kPa 0.0401865 # need to verify
1 mPa = 1000 kPa
"""
def psi2inchwc(self, psi) :
return psi * 27.70759
def mbar2inchwc(self, mbar) :
return mbar * 0.401865
def kPa2inchwc(self, kPa) :
return kPa * 0.0401865 # need to verify
def c2f(self, tempC) :
return (tempC * 9.0 / 5.0 + 32.0)
def pres2inwc(self, pressure) :
return pressure * self.__conv2inchwc
# end class Abp
if __name__ == '__main__':
print("Press CTRL+C to exit...")
try:
abp = SensorHnyAbp("060MG2") # 0 to 60 mbar gage I2C
# abp = SensorHnyAbp("001PDS") # -1 to +1 psi diff SPI
while True:
"""
result = abp.readAbp()
print('Press: {0:7.3f} {1:s} {2:7.2f} in.wc'.
format(round(result,3), abp.PRES_UNITS, round(abp.pres2inwc(result),2)) )
status, result = abp.readAbpStatus()
print('Status: {0:d} Press: {1:7.3f} {2:s} {3:7.2f} in.wc'.
format(status, round(result,3), abp.PRES_UNITS, round(abp.pres2inwc(result),2)) )
"""
status, result, tempC = abp.readAbpStatusTemp()
if 0 : # mbar
print('Status: {0:d} Press: {1:7.3f} {2:s} {3:7.2f} in.wc {4:5.1f} degF'.
format(status, round(result,3), abp.PRES_UNITS, round(abp.pres2inwc(result),2), round(abp.c2f(tempC),1)) )
else : # psi
print('Status: {0:d} Press: {1:7.3f} {2:s} {3:7.2f} in.wc {4:5.1f} degF'.
format(status, round(result,3), abp.PRES_UNITS, round(abp.pres2inwc(result),2), round(abp.c2f(tempC),1)) )
time.sleep(1) # Print out every second
except KeyboardInterrupt:
sys.exit(" Exit")