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Pierrick C 2018-08-25 11:38:05 +02:00
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commit 67b7fdce68
1 changed files with 138 additions and 127 deletions
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circuitpython/code/main.py
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@ -15,7 +15,6 @@
##########################
# Weather and GPS logger #
##########################
Author : Pierrick "Arofarn" Couturier
Use with:
* Adafruit Feather M4 Express (CircuitPython firmware)
@ -43,41 +42,46 @@ TODO for v1 :
* send data through UART (work-in-progress)
"""
__version__ = 0.2
__author__ = "arofarn"
#######################
import time
import gc
import os
import rtc
import microcontroller
import board
# import micropython
from busio import I2C, UART
from analogio import AnalogIn
from digitalio import DigitalInOut, Direction
from adafruit_bme280 import Adafruit_BME280_I2C
from adafruit_gps import GPS
import neopixel
##########
# config #
##########
print_data = True # Print data on USB UART / REPL output ?
send_json_data = True # Send data as JSON on second UART ?
backup_data = True # Write data as CSV files on onboard SPI Flash ?
data_to_neopixel = True # Display atmospheric data as color on onboard neopixel ?
gps_enable = True # Use GPS module ?
update_interval = const(10) # Interval between data acquisition (in seconds)
write_interval = const(60) # Interval between data written on flash Memory
send_interval = const(60) # Interval between packet of data sent to Rpi
datetime_format = "{:04}/{:02}/{:02}_{:02}:{:02}:{:02}" # Date/time format
neopixel_max_value =const(70) #max value instead of brightness to spare some mem
#######################
import microcontroller, board
import gc, os
# import micropython
import time, rtc
from busio import I2C, UART
from analogio import AnalogIn
from digitalio import DigitalInOut, Direction
from adafruit_bme280 import Adafruit_BME280_I2C
from adafruit_gps import GPS
import neopixel
print_data_flag = True # Print data on USB UART / REPL output ?
send_json_flag = True # Send data as JSON on second UART ?
backup_data_flag = True # Write data as CSV files on onboard SPI Flash ?
neopixel_flag = True # Display atmospheric data as color on onboard neopixel ?
gps_enable_flag = True # Use GPS module ?
UPDATE_INTERVAL = 10 # Interval between data acquisition (in seconds)
WRITE_INTERVAL = 60 # Interval between data written on flash Memory
SEND_INTERVAL = 60 # Interval between packet of data sent to Rpi
TIME_FORMAT = "{:04}/{:02}/{:02}_{:02}:{:02}:{:02}" # Date/time format
NEOPIXEL_MAX_VALUE = 70 # max value instead of brightness to spare some mem
###########
# Classes #
###########
class Data:
"""Class for handling data"""
def __init__(self):
self.data = {'SYS': {'time': "2000/01/01_00:00:00",
'vbat': int(),
@ -90,15 +94,14 @@ class Data:
'lon': float(),
'alt': float(),
'qual': int(),
'age': int() }
}
'age': int()}}
self._gps_last_fix = int()
self._gps_current_fix = int()
def update(self):
"""Read the data from various sensors and update the data dict variable"""
# Data from Feather board
self.data['SYS']['time'] = datetime_format.format(*clock.datetime[0:6])
self.data['SYS']['time'] = TIME_FORMAT.format(*clock.datetime[0:6])
self.data['SYS']['vbat'] = round(measure_vbat(), 3)
self.data['SYS']['cput'] = round(microcontroller.cpu.temperature, 2)
@ -107,11 +110,11 @@ class Data:
self.data['BME']['hum'] = int(bme280.humidity)
self.data['BME']['press'] = round(bme280.pressure, 2)
if gps_enable:
if gps_enable_flag:
self._gps_current_fix = int(time.monotonic())
if gps.has_fix:
self._gps_last_fix = self._gps_current_fix
self.data['GPS']['time'] = datetime_format.format(gps.timestamp_utc.tm_year,
self.data['GPS']['time'] = TIME_FORMAT.format(gps.timestamp_utc.tm_year,
gps.timestamp_utc.tm_mon,
gps.timestamp_utc.tm_mday,
gps.timestamp_utc.tm_hour,
@ -131,7 +134,7 @@ class Data:
"""Serialize data for visualization on serial console"""
for source in self.data.keys():
print(source + ": ")
if not self.data[source] == None:
if not self.data[source] is None:
for d in self.data[source].items():
print("\t{0}: {1}".format(d[0], d[1]))
@ -147,7 +150,7 @@ class Data:
else:
comma_src = ","
output = '{}{}"{}":'.format(output, comma_src, source)
if not self.data[source] == None:
if not self.data[source] is None:
output = output + '{'
first_data = True
for d in self.data[source].items():
@ -172,35 +175,37 @@ class Data:
# RED componant calculation from temperature data
# 10 is the min temperature, 25 is the range
# (10+25=35°C = max temperature)
red = int((self.data['BME']['temp']-10)*neopixel_max_value/25)
if red > neopixel_max_value:
red = neopixel_max_value
red = int((self.data['BME']['temp']-10)*NEOPIXEL_MAX_VALUE/25)
if red > NEOPIXEL_MAX_VALUE:
red = NEOPIXEL_MAX_VALUE
if red < 0:
red = 0
# BLUE componant calculation: very simple! By definition relative
# humidity cannot be more than 100 or less than 0, physically
blue = int(self.data['BME']['hum']*neopixel_max_value/100)
blue = int(self.data['BME']['hum']*NEOPIXEL_MAX_VALUE/100)
# GREEN component calculation : 960 is the minimum pressure and 70 is
# the range (960+70 = 1030hPa = max pressure)
green = int((self.data['BME']['press']-960)*neopixel_max_value/70)
if green > neopixel_max_value:
green = neopixel_max_value
green = int((self.data['BME']['press']-960)*NEOPIXEL_MAX_VALUE/70)
if green > NEOPIXEL_MAX_VALUE:
green = NEOPIXEL_MAX_VALUE
if green < 0:
green = 0
if print_data:
if print_data_flag:
print("Col:{}".format((red, green, blue)))
return (red, green, blue)
def write_on_flash(self):
"""Save the current data as csv file on SPI flash"""
global backup_data_flag
try:
with open("data/data.csv", "a") as csv_file:
if gps_enable:
csv_file.write("{};{};{};{};{};{};{};{};{};{}\n".format(self.data['SYS']['time'],
if gps_enable_flag:
csv_file.write("{};{};{};{};{};{};{};{};{};{}\n".format(
self.data['SYS']['time'],
self.data['BME']['temp'],
self.data['BME']['hum'],
self.data['BME']['press'],
@ -212,15 +217,18 @@ class Data:
self.data['GPS']['qual'],
))
else:
csv_file.write("{};{};{};{};{};;;;;\n".format(self.data['SYS']['time'],
csv_file.write("{};{};{};{};{};;;;;\n".format(
self.data['SYS']['time'],
self.data['BME']['temp'],
self.data['BME']['hum'],
self.data['BME']['press'],
self.data['SYS']['vbat']
self.data['SYS']['vbat'],
))
except OSError as e:
print("Err {}: readonly".format(e))
backup_data = False #to avoid trying again till next reset
except OSError as err:
print("Err {}: readonly".format(err))
# to avoid trying again till next reset
backup_data_flag = False
# Turn onboard led on to indicate read-only error
led13.value = True
@ -228,8 +236,10 @@ class Data:
# Functions #
#############
def check_data_dir():
"""Check if data directories exists"""
global backup_data_flag
try:
if 'data' not in os.listdir():
os.mkdir('data')
@ -239,27 +249,27 @@ def check_data_dir():
os.mkdir('data/hourly')
elif 'daily' not in os.listdir('data'):
os.mkdir('data/daily')
except OSError as e:
print("Err {}: readonly".format(e))
backup_data = False #to avoid trying again till next reset
except OSError as err:
print("Err {}: readonly".format(err))
backup_data_flag = False # to avoid trying again till next reset
# Turn onboard led on to indicate read-only error
led13.value = True
def rotate_files():
def rotate_files(last_time):
"""Check if files need to rotate
=> every new hour
=> every new day
"""
global last_time
current_time = clock.datetime
# If the hour changed : copy current data.csv to hourly directory
if current_time[3] != last_time[3] and backup_data:
if current_time[3] != last_time[3] and backup_data_flag:
print("Time to move hourly data !")
os.rename("data/data.csv", "data/hourly/{:02}.csv".format(last_time[3]))
# If the day changed : copy content of hourly to daily directories
if current_time[2] != last_time[2] and backup_data:
if current_time[2] != last_time[2] and backup_data_flag:
print("Time to move daily data !")
# Create new dir for the date of yesterday
newdir = "data/daily/{}{:02}{:02}".format(*last_time[0:3])
@ -270,16 +280,15 @@ def rotate_files():
os.rename("data/hourly/{}".format(file), "{}/{}".format(newdir, file))
# Finally update last_time, each time
last_time = current_time
return current_time
def set_clock_from_GPS(treshold=5.0):
def set_clock_from_gps(treshold=5.0):
"""Compare internal RTC and date-time from GPS (if enable and fixed) and set
the RTC date time to GPS date-time if the difference is more or equal to
threshold (in seconds)"""
if gps_enable and gps.has_fix:
#Congreen GPS timestamp into struct_time
if gps_enable_flag and gps.has_fix:
gps_datetime = time.struct_time((gps.timestamp_utc.tm_year,
gps.timestamp_utc.tm_mon,
gps.timestamp_utc.tm_mday,
@ -289,10 +298,11 @@ def set_clock_from_GPS(treshold=5.0):
# Max difference between GPS and internal RTC (in seconds):
if abs(time.mktime(gps_datetime) - time.mktime(clock.datetime)) >= treshold:
# print("Clock difference with GPS!")
# print("Previous date/time : " + datetime_format.format(*clock.datetime[0:6]))
# print("Previous date/time : " + TIME_FORMAT.format(*clock.datetime[0:6]))
clock.datetime = gps_datetime # Trust GPS if there is a bias
print("Clocks synced !")
def measure_vbat(samples=10, timestep=0.01):
"""Measure Vbattery as the mean of n samples with timestep second between
each measurement"""
@ -301,16 +311,17 @@ def measure_vbat(samples=10, timestep=0.01):
# 2 : voltage is divided by 2
# 3.3 : Vref = 3.3V
# 65536 : 16bit ADC
v = 0
val = 0
for i in range(samples):
v = v + vbat.value
val = val + vbat.value
time.sleep(timestep)
return v/samples*0.000100708
return val/samples*0.000100708
#########
# Setup #
#########
gc.collect()
# micropython.mem_info()
@ -338,8 +349,8 @@ led13.direction = Direction.OUTPUT
led13.value = False
# Set GPS module on FeatherWing board
gps_en_pin.value = not gps_enable #Set enable pin high to disable GPS module
if gps_enable:
gps_en_pin.value = not gps_enable_flag # Set enable pin high to disable GPS module
if gps_enable_flag:
gps_uart = UART(board.TX, board.RX,
baudrate=9600, timeout=3000)
gps = GPS(gps_uart)
@ -348,13 +359,13 @@ if gps_enable:
gps.send_command('PMTK220,1000') # 1000 ms refresh rate
# Second UART to communicate with raspberry pi (throught GPIO)
if send_json_data:
if send_json_flag:
rpi_uart = UART(board.A2, board.A3,
baudrate=115200, timeout=2000)
# Set onboard Neopixel : used as atmo data output
# brightness is fixed to 1 to spare some memory. Use neopixel_max_value instead
if data_to_neopixel:
# brightness is fixed to 1 to spare some memory. Use NEOPIXEL_MAX_VALUE instead
if neopixel_flag:
pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=1)
else:
# if neopixel is disable : turn off the LED
@ -369,36 +380,36 @@ check_data_dir()
# Main loop #
#############
#Create the Data object
data = Data()
#Init timer
# Init timers
last_update = last_sent_packet = last_written_data = time.monotonic()
last_time = clock.datetime
last_rotation = clock.datetime
while True:
if gps_enable:
if gps_enable_flag:
gps.update()
current = time.monotonic()
if current - last_update >= update_interval:
if current - last_update >= UPDATE_INTERVAL:
last_update = current
set_clock_from_GPS()
set_clock_from_gps()
data.update()
if print_data:
if print_data_flag:
data.show()
if data_to_neopixel:
if neopixel_flag:
pixel[0] = data.rgb
if send_json_data and current - last_sent_packet >= send_interval :
if send_json_flag and current - last_sent_packet >= SEND_INTERVAL:
last_sent_packet = current
rpi_uart.write(data.json + '\n')
print(data.json + '\n')
if backup_data and current - last_written_data >= write_interval :
if backup_data_flag and current - last_written_data >= WRITE_INTERVAL:
last_written_data = current
rotate_files() #First check if files need to rotate
# First check if files need to rotate
last_rotation = rotate_files(last_rotation)
print("Backup data...")
data.write_on_flash()