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Shortened error messages

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This commit is contained in:
Kristjan Komlosi
2020-07-13 11:52:22 +02:00
parent 89ea9564c8
commit 4878df9ca8
4 changed files with 214 additions and 23 deletions
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2
backend/app.py
View File

@@ -8,7 +8,7 @@ app = Flask(__name__)
@app.route('/data')
def sendData():
'''Responder function for /data route'''
s = sensors.Spectrometer(path='/dev/serial0', baudrate=115200, tout=1)
s = sensors.Spectrometer(path='/dev/serial0')
u = sensors.UVSensor()
l = sensors.LxMeter()
response = jsonify([s.getData(), l.getData(), u.getABI()])

43
backend/sensors.py
View File

@@ -6,8 +6,10 @@ import serial as ser
import pandas as pd
import smbus2
class Spectrometer:
'''Class representing the AS7265X specrometer'''
def initializeSensor(self):
'''confirm the sensor is responding and proceed\
with spectrometer initialization'''
@@ -23,8 +25,7 @@ class Spectrometer:
if rstring == 'ERROR':
raise Exception # sensor is in error state
except:
raise Exception(
'An exception ocurred when performing spectrometer handshake')
raise Exception('No AT command response')
def setParameters(self, parameters):
'''applies the parameters like LED light and gain to the spectrometer'''
@@ -53,8 +54,7 @@ class Spectrometer:
self.serialObject.write('ATLED3={}\n'.format(led).encode())
self.serialObject.readline()
except:
raise Exception(
'An exception occured during spectrometer initialization')
raise Exception('Error setting spectrometer parameters')
def getData(self):
'''Returns spectral data in a pandas DataFrame.'''
@@ -62,8 +62,7 @@ class Spectrometer:
self.serialObject.write(b'ATCDATA\n')
rawresp = self.serialObject.readline().decode()
except:
raise Exception(
'An exception occurred when polling for spectrometer data')
raise Exception('Error polling spectrometer data')
else:
responseorder = list('RSTUVWGHIJKLABCDEF')
realorder = list('ABCDEFGHRISJTUVWKL')
@@ -78,14 +77,14 @@ class Spectrometer:
try:
self.serialObject = ser.Serial(path, baudrate, timeout=tout)
except:
raise Exception(
'An exception occured when opening the serial port at {}'.format(path))
raise Exception('Error opening serial port: {}'.format(path))
else:
self.initializeSensor()
class LxMeter:
'''Class representing the APDS-9301 digital photometer.'''
def __init__(self, busNumber=1, addr=0x39):
self.addr = addr
try:
@@ -93,14 +92,14 @@ class LxMeter:
self.bus = smbus2.SMBus(busNumber)
except:
raise Exception(
'An exception occured opening the SMBus {}'.format(self.bus))
'Error opening SMBus {}'.format(self.bus))
try:
self.bus.write_byte_data(
self.addr, 0xa0, 0x03) # enable the sensor
self.setGain(16)
except:
raise Exception('An exception occured when enabling lux meter')
raise Exception('Error enabling lux meter')
def setGain(self, gain):
'''Set the sensor gain. Either 1 or 16.'''
@@ -109,15 +108,13 @@ class LxMeter:
temp = self.bus.read_byte_data(self.addr, 0xa1)
self.bus.write_byte_data(self.addr, 0xa1, 0xef & temp)
except:
raise Exception(
'An exception occured when setting lux meter gain')
raise Exception('Error setting lux meter gain')
if gain == 16:
try:
temp = self.bus.read_byte_data(self.addr, 0xa1)
self.bus.write_byte_data(self.addr, 0xa1, 0x10 | temp)
except:
raise Exception(
'An exception occured when setting lux meter gain')
raise Exception('Error setting lux meter gain')
else:
raise Exception('Invalid gain')
@@ -176,6 +173,7 @@ class LxMeter:
class UVSensor:
'''Class representing VEML6075 UVA/B meter'''
def __init__(self, bus=1, addr=0x10):
self.addr = addr
try:
@@ -189,13 +187,14 @@ class UVSensor:
self.bus.write_byte_data(self.addr, 0x00, 0b00010000)
# trigger a measurement to prevent bus errors at first read
self.bus.write_byte_data(self.addr, 0x00, 0b00010010) # UV_AF=1
self.bus.write_byte_data(self.addr, 0x00, 0b00010110) # UV_TRIG=1
self.bus.write_byte_data(self.addr, 0x00, 0b00010000) # normal mode
self.bus.write_byte_data(self.addr, 0x00, 0b00010010) # UV_AF=1
self.bus.write_byte_data(self.addr, 0x00, 0b00010110) # UV_TRIG=1
self.bus.write_byte_data(
self.addr, 0x00, 0b00010000) # normal mode
except:
raise Exception(
'An exception occured when initalizing the UV Sensor')
'Error initalizing the UV Sensor')
def getABI(self):
'''Calculates the UVA and UVB irradiances,
@@ -208,14 +207,14 @@ class UVSensor:
c1 = self.bus.read_word_data(self.addr, 0x0a)
c2 = self.bus.read_word_data(self.addr, 0x0b)
except:
raise Exception('An exception occured when fetching raw UV data')
raise Exception('Error fetching raw UV data')
# Refer to Vishay app note 84339 and Sparkfun VEML6075 documentation.
# The computed values may be negative if UV is vastly weaker than
# visible and IR light. This is not a bug!
a = (aRaw - 2.22 * c1 - 1.33 * c2) * 1.06
b = (bRaw - 2.95 * c1 - 1.74 * c2) * 0.48
i = (a + b) / 2 # calculate UV index
i = (a + b) / 2 # calculate UV index
return [a, b, i]
def on(self):
@@ -226,7 +225,7 @@ class UVSensor:
self.bus.write_byte_data(self.addr, 0x00, 0x10)
except:
raise Exception(
'An exception occured when turning the UV sensor on')
'Error turning the UV sensor on')
def off(self):
'''Shuts the UV sensor down.'''
@@ -236,4 +235,4 @@ class UVSensor:
self.bus.write_byte_data(self.addr, 0x00, 0x11)
except:
raise Exception(
'An exception occured when shutting the UV sensor down')
'Error shutting the UV sensor down')