# Weather and GPS logger ########## # config # ########## print_data = True data_to_neopixel = True gps_enable = True update_interval = 5 # in seconds send_json_data = True datetime_format = "{:04}/{:02}/{:02}_{:02}:{:02}:{:02}" neopixel_max_value =const(100) #max value instead of brightness to spare some mem ####################### import board, microcontroller import gc, os # import micropython import time, rtc from busio import I2C, UART from analogio import AnalogIn from adafruit_bme280 import Adafruit_BME280_I2C from adafruit_gps import GPS import neopixel ########### # Classes # ########### class Data: """Class for handling data""" def __init__(self): self.data = {} def update(self): """Read the data from various sensors and update the data dict variable""" #Data from Feather board self.data['SYS'] = {'time': {'val': datetime_format.format(*clock.datetime[0:6]), 'unit': '' }, 'v_bat': {'val': vbat.value*0.000100708, 'unit': 'V' }, 'CPU_temp': {'val': microcontroller.cpu.temperature, 'unit': '°C' }} # Note about v_bat calculation : # 0.000100708 = 2*3.3/65536 with # 2 : voltage is divided by 2 # 3.3 : Vref = 3.3V # 65536 : 16bit ADC #Data from BME280 self.data['BME280'] = {'temp': { 'val': bme280.temperature, 'unit': '°C' }, 'hum': { 'val': bme280.humidity, 'unit': '%' }, 'press': { 'val': bme280.pressure, 'unit': 'hPa' }} if gps_enable: if gps.has_fix: self.data['GPS'] = {'timestamp': {'val': datetime_format.format(gps.timestamp_utc.tm_year, gps.timestamp_utc.tm_mon, gps.timestamp_utc.tm_mday, gps.timestamp_utc.tm_hour, gps.timestamp_utc.tm_min, gps.timestamp_utc.tm_sec), 'unit': ''}, 'lat': {'val': gps.latitude, 'unit': 'deg'}, 'lon': {'val': gps.longitude, 'unit': 'deg'}, 'alt': {'val': gps.altitude_m, 'unit': 'm'}, 'qual': {'val': gps.fix_quality, 'unit': ''}} else: self.data['GPS'] = {'lat': {'val': None, 'unit': 'deg'}, 'lon': {'val': None, 'unit': 'deg'}, 'alt': {'val': None, 'unit': 'm'}} else: self.data['GPS'] = None def show(self): """Serialize data to json-formatted string for visualization on serial console """ for source in self.data.keys(): print(source + ": ") if not self.data[source] == None: for d in self.data[source].items(): print("\t{0}: {val} {unit}".format(d[0], **d[1])) def json(self): """Serialize data to json-formatted string""" output = "{" for source in self.data.keys(): output = "".join((output, "'", source, "': \n")) if not self.data[source] == None: for d in self.data[source].items(): output = "".join((output, "{", "'{}': ".format(d[0]), "{", "'val': {val},'unit': {unit}".format(**d[1]), "}}\n")) output = output + "}, \n" output = output + "}" return output ############# # Functions # ############# def check_data_dir(): """Check if data directories exists""" if 'data' not in os.listdir(): os.mkdir('data') os.mkdir('data/hourly') os.mkdir('data/daily') elif 'hourly' not in os.listdir('data'): os.mkdir('data/hourly') elif 'daily' not in os.listdir('data'): os.mkdir('data/daily') def update_neopixel(data): """Convert atmospheric data from BME280 sensor into NeoPixel color * RED => temperature : max = 35degC, min =10degC (range 25°C) * BLUE => humidity : max= 100%, mini=0% * GREEN => pression : mini=960hPa, maxi = 1030hPa (range 70hPa) """ rouge = int((data['BME280']['temp']['val']-10)*neopixel_max_value/25) if rouge > neopixel_max_value: rouge = neopixel_max_value if rouge < 0: rouge = 0 bleu = int(data['BME280']['hum']['val']*neopixel_max_value/100) vert = int((data['BME280']['press']['val']-960)*neopixel_max_value/70) if vert > neopixel_max_value: vert = neopixel_max_value if vert < 0: vert = 0 if print_data: print("Col:{}".format((rouge, vert, bleu))) return (rouge, vert, bleu) def set_clock_from_GPS(): if gps_enable and gps.has_fix: #Convert GPS timestamp into struct_time gps_datetime = time.struct_time((gps.timestamp_utc.tm_year, gps.timestamp_utc.tm_mon, gps.timestamp_utc.tm_mday, gps.timestamp_utc.tm_hour, gps.timestamp_utc.tm_min, gps.timestamp_utc.tm_sec, 0, 0, 0)) #Max difference between GPS and internal RTC (in seconds): if abs(time.mktime(gps_datetime) - time.mktime(clock.datetime)) >= 5.0: print("Clock difference with GPS!") print("Previous date/time : " + datetime_format.format(*clock.datetime[0:6])) clock.datetime = gps_datetime #Trust GPS if there is a bias print("New date/time : " + datetime_format.format(*clock.datetime[0:6])) ######### # Setup # ######### gc.collect() #micropython.mem_info() #Enable RTC of the feather M0 board clock = rtc.RTC() #clock.datetime = time.struct_time((2018, 7, 29, 15, 31, 30, 0, 0, 0)) # BME280 sensors (I2C) i2c = I2C(board.SCL, board.SDA) # i2c addresses for BME280 breakout : # 0x77 = adafruit breakout board # 0x76 = tiny chinese board bme280 = Adafruit_BME280_I2C(i2c, address=0x76) # Battery voltage vbat = AnalogIn(board.D9, ) # GPS on FeatherWing board if gps_enable: gps_uart = UART(board.TX, board.RX, baudrate=9600, timeout=3000) gps = GPS(gps_uart) # Turn on the basic GGA and RMC info gps.send_command('PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0') gps.send_command('PMTK220,1000') # 1000 ms refresh rate # Integrated Neopixel if data_to_neopixel: pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=1) else: #if neopixel is disable : turn off the LED pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=1) pixel[0] = (0,0,0) pixel = None check_data_dir() ############# # Main loop # ############# data = Data() last_update = time.monotonic() while True: if gps_enable: gps.update() current = time.monotonic() if current - last_update >= update_interval: last_update = current set_clock_from_GPS() data.update() if print_data: data.show() # print(data.json()) if data_to_neopixel: pixel[0] = update_neopixel(data.data) gc.collect() # micropython.mem_info(1) # print('Memory free: {} allocated: {}'.format(gc.mem_free(), gc.mem_alloc()))