Python Forum

Hi,

Recently I acquired a raspberry pi 3 which my grandson got bored with and decided to make a simple weather station.
The goals are:
1. To connect a temperature/pressure/humidity/sensor to the raspberry
2. Collect readings
3. The readings should be visible on screen
4. A pause (sleep) value can be changed to suit
5. The readings should also be saved to a spreadsheet.
I am completely new to Python (did some html in my time purely for my own website)
So far, however , although I have succeeded with goals 1,2,3 , 4, but can't get readings to appear in my spreadsheet.


Raspberry pi 3
Pi OS = Raspbian GNU UNIX 10 Buster
Python 3.7.3
Thonny 3.3.3

The .py file and the xlsx file are in the same folder

[i]The script below runs without error , but data does not appear in the spreadsheet.
If I populate the 1st row of spreadsheet with some random numbers , it gets wiped and replaced with blanks.
I have spent 2 or 3 weeks with different versions to achieve the different goals .... this version achieves all goals except one

import smbus2
import bme280
from time import sleep
import time
import datetime
from datetime import date
#installed openpyxl at terminal with "sudo pip3 install openpyxl"

from openpyxl import *
amounts, row = [1, 2, 3, 4, 5], 2
workbook = load_workbook("/home/pi/weather-station/bme280_data.xlsx")

port=1
address=0x76
bus=smbus2.SMBus(port)

def update_temp():
    temperature = p.read_temp_c()
    temp_text.value = temperature
    temp_text.after(1000, update_temp)
#load the workbook and select the sheet
workbook = workbook
filename = "/home/pi/weather-station/bme280_data.xlsx"
sheet = workbook.active
today=date.today
now=datetime.datetime.now().time()
bme280_data=bme280.sample(bus,address)
humidity=bme280_data.humidity
pressure=bme280_data.pressure
ambient_temperature=bme280_data.temperature
#
for i, value in enumerate(amounts):
    sheet.cell(column=i+1, row=row, value=value)
#
counter=1
while 1:
    if not counter % 10:

        bme280_data=bme280.sample(bus,address)
        humidity=bme280_data.humidity
        pressure=bme280_data.pressure
        ambient_temperature=bme280_data.temperature
        now=datetime.datetime.now().time()
    print('Adding sensor data to spreadsheet:')
    print(today)
    print(now)
    print('Humidity:'+str(round(humidity,2)))
    print('Pressure:'+str(round(pressure,2)))
    print('Ambiant_Temperature:'+str(round(ambient_temperature,2)))
    time.sleep(10)
#append data to spreadsheet
row=(today, now, ambient_temperature, pressure, humidity)
sheet.append(row)
#Save the workbook
workbook.save('/home/pi/weather-station/bme280_data.xlsx')
counter += 1 #increment counter by 1

On line 36-50 you have infinite loop. Inside the loop you never update workbook and you never break out of the loop.

By the way I don't see the purpose of update_temp function and where it is used.

Thanks Buran