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#!/usr/bin/python
#-------------------------------------------------------------------readtemp.py
#
# detect i2c temperature sensor, read it, and put its data where node_exporter
# will send it to prometheus.
#
# (C) D Delmar Davis 2023-24
#
# Note: POC lots of hard coded foo here....
# should probly be some sort of arguments for file name.
# your crontab should look like this
# */1 * * * * /usr/local/bin/readtemp.py
import sys
import board
import adafruit_tc74
import adafruit_ahtx0
import adafruit_sht4x
import adafruit_mcp9808
from adafruit_dps310.basic import DPS310
import tempfile
import os
i_can_has_temperature = False
i_can_has_humidity = False
i_can_has_pressure = False
temperature_read=0
humidity_read=0
pressure_read=0
i2c = board.I2C() # uses board.SCL and board.SDA
print(i2c.scan())
for tempsensorid in i2c.scan():
if (tempsensorid==72):
print ("found a TC74")
sensor = adafruit_tc74.TC74(i2c)
temperature_read=sensor.temperature
i_can_has_temperature = True
elif (tempsensorid==56):
print ("found an AHTx0")
sensor = adafruit_ahtx0.AHTx0(i2c)
temperature_read=sensor.temperature
i_can_has_temperature = True
humidity_read = sensor.relative_humidity
i_can_has_humidity = True
elif (False): #tempsensorid==44):
print ("found an SHT4x")
sensor = adafruit_sht4x.SHT4x(board.I2C())
temperature_read=sensor.temperature
i_can_has_temperature = True
humidity_read = sensor.relative_humidity
i_can_has_humidity = True
elif (tempsensorid==119):
print ("found a EPS310")
sensor = DPS310(i2c)
temperature_read=sensor.temperature
i_can_has_temperature = True
pressure_read = sensor.pressure
i_can_has_pressure = True
elif (tempsensorid==24):
print ("found an mcp9808")
sensor = adafruit_mcp9808.MCP9808(i2c)
temperature_read=sensor.temperature
i_can_has_temperature = True
else:
print ("found something else ", tempsensorid)
if (i_can_has_temperature):
tmpfile =os.path.join(tempfile.gettempdir(),'temp.prom')
file = open(tmpfile, 'w')
sys.stdout = file
print("# HELP home_temperature_farenheit Temperature read off of external sensor.")
print("# TYPE home_temperature_farenheit gauge")
print("home_temperature_farenheit %0.3f" % ((temperature_read * 1.8) + 32.0))
print("# HELP home_temperature_celsius Temperature read off of external sensor.")
print("# TYPE home_temperature_celsius gauge")
print("home_temperature_celcius %0.3f" % temperature_read)
if (i_can_has_humidity):
print("# HELP home_relative_humidity Temperature read off of external sensor.")
print("# TYPE home_relative_humidity gauge")
print("home_relative_humidity %0.3f" % humidity_read)
if (i_can_has_pressure):
print("# HELP home_barometric_pressure Barometric Pressure read off of external sensor.")
print("# TYPE home_barometric_pressure gauge")
print("home_barometric_pressure %0.3f" % pressure_read)
file.close()
os.replace(tmpfile, '/var/lib/prometheus/node-exporter/temp.prom')
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