Enviro + Sensor Data Plotting

Support
1

Hi Guys,

I’m sorry, I’m very new to the python and sensors game :)

I’ve recently purchased Enviro+ and would like to plot out the data. How are you guys plotting your sensors outputs?

I did some Googling and looks like you can try to use Plotly, Adafruit OI and more manual like this one Data Collection, Logging, Plotting & Serving - A Simple Guide

I have tried to adopt the python from examples and the guide but ran into issues in the exporting to CSV part:

 #!/usr/bin/env python

import time
import csv
from bme280 import BME280
from datetime import datetime

try:
    from smbus2 import SMBus
except ImportError:
    from smbus import SMBus

dt = datetime.now()

full_date = dt.strftime("%Y-%m-%d")
full_time = dt.strftime("%H:%M:%S")
full_day = dt.strftime("%A")
year = dt.year
month = dt.month
date = dt.day
hour = dt.hour

bus = SMBus(1)
bme280 = BME280(i2c_dev=bus)



temperature = bme280.get_temperature()
pressure = bme280.get_pressure()
humidity = bme280.get_humidity()
csvWrite = full_date, full_time, full_day, year, month, date, hour, temperature, pressure, humidity
csvFile = open("/home/pi/enviroplot.csv", "a")

while True:
    with csvFile:
        writer = csv.writer(csvFile)
        writer.writerow(csvWrite)
        time.sleep(1)

Errors:

Traceback (most recent call last):
  File "Weather_Plot_Test.py", line 35, in <module>
    with csvFile:
ValueError: I/O operation on closed file
2

I signed up for an account at emoncms.org and am sending my data every 30s there. It’s an interim solution, I just wanted a way to start saving & graphing the output!

3

Thank you! I will have a look. I was hoping to set up something locally on the Pi

I come from Networking world and I’m surprised there is no PRTG equivalent solution to these sensors :)

I should mention that I run the Pi headless so i cant use the matplotlib option.

4

#Azazel try this code
import time
import smbus2
import bme280

bus = smbus2.SMBus(1)
address = 0x77

calibration_params = bme280.load_calibration_params(bus, address)
layout = ‘{0:5d}: {1}, {2:0.3f} deg C, {3:0.2f} hPa, {4:0.2f} %’
counter = 1

while True:
data = bme280.sample(bus, address, calibration_params)
with open(“sample.log”,“a+”) as f:
f.write(layout.format(counter, data.timestamp, data.temperature, data.pressure, data.humidity) + “\n”)
f.close()
counter += 1
time.sleep(5)

5

Hey Mate,

Thank you for the advise!

I am getting the following error though:

pi@RaspberryPiEnviro:~ $ /usr/bin/python3 /home/pi/export.py
  File "/home/pi/export.py", line 13
    data = bme280.sample(bus, address, calibration_params)
       ^
IndentationError: expected an indented block

It OK I’ve started on working on Crontab idea.

Any tips on how to get python to show the light sensors?
It seems that you need to run it for few seconds to get the reading, so the single “lux = ltr559.get_lux()” will no do.

I have tried the following but no go:

#Light

lux = ltr559.get_lux()

def get_lux_avg():

while lux != 0:

    time.sleep(1)

return lux

avg_lux = get_lux_avg()

6

I give up trying to post the indented code in this forum. This forum
is _ _ _ _ _ _ _ piece of _ _ _ _ !