def getDevice():
# This function is used to query the OneWireBus (OWB) to grab a list
# of devices. This function expects that the sensor is wired up to
# Digital pin 2. If you used a different pin, change the following
# line of code:
owb = OneWireBus(board.D2)
devices = owb.scan()
for device in devices:
idString = "ROM = {} \tFamily = 0x{:02x}".format(
[hex(i) for i in device.rom], device.family_code)
#
# This is the particular sensor identification string returned by the DS18B20 that I am using.
# You might have to modify this string if it doesn't work for you. You can log output to Mu serial console
# to see the idStrings for all your OneWire devices.
# e.g.
# print idString
if idString == "ROM = ['0x28', '0xaa', '0x81', '0x2', '0x38', '0x14', '0x1', '0xfe'] Family = 0x28":
ds18b20 = adafruit_ds18x20.DS18X20(owb, device)
#
# There are several resolution settings (e.g. how many significant digits of temperature are sent)
# The settings are 9,10,11,12. Just FYI, the larger the resolution, the longer the time to generate
# the data (we're talking 100-700ms) but for our purposes I would rather have ALL THE SIGNIFICANT DIGITS!
# See here for more info: https://www.maximintegrated.com/en/app-notes/index.mvp/id/4377 or https://cdn-shop.adafruit.com/datasheets/DS18B20.pdf
# So, 12 it is. :-)
ds18b20.resolution = 12
return ds18b20
return None
def measure_temps(sensor_list=None):
names = sensors.keys() if sensor_list is None else sensor_list
readings = OrderedDict()
pixel[0] = READING
for s_name in names:
readings[s_name] = sensors[s_name]()
pixel[0] = BLACK
return readings
i2c = board.I2C()
ow_bus = OneWireBus(DS18X20_PIN)
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)
sht31d = adafruit_sht31d.SHT31D(i2c)
ds18b20 = adafruit_ds18x20.DS18X20(ow_bus, find_DS18X20(ow_bus,
verbose=VERBOSE))
pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
ntc_ain = AnalogIn(NTC_PIN)
tmp36_ain = AnalogIn(TMP36_PIN)
lm35_ain = AnalogIn(LM35_PIN)
vref = ntc_ain.reference_voltage
### Review PAD_TO_LEN if extending this dict
sensors = OrderedDict([("bmp280", lambda: bmp280.temperature),
("sht31d", lambda: sht31d.temperature),
("cpu", lambda: microcontroller.cpu.temperature),
("ds18b20", lambda: ds18b20.temperature),
("tmp36",
lambda: get_voltage(tmp36_ain) * 100.0 - 50.0),
import busio
import digitalio
from digitalio import DigitalInOut
import time
import gc
import adafruit_bme280
from adafruit_onewire.bus import OneWireBus
ow_bus = OneWireBus(board.A5)
devices = ow_bus.scan()
for device in devices:
print("ROM = {} \tFamily = 0x{:02x}".format([hex(i) for i in device.rom],
device.family_code))
import adafruit_ds18x20
ds18b20 = adafruit_ds18x20.DS18X20(ow_bus, devices[0])
# Get Wifi and FarmOS details
try:
from secrets import secrets
except ImportError:
print("WiFi secrets are kept in secrets.py, please add them there!")
raise
WIFI_ESSID = secrets['ssid']
WIFI_PASS = secrets['password']
farmos_pubkey = secrets['farmos_pubkey']
farmos_privkey = secrets['farmos_privkey']
base_url = "https://edgecollective.farmos.net/farm/sensor/listener/"