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+--- Thread: live updated json file (/thread-29191.html)
live updated json file - Nyanpasu - Aug-22-2020
Dear Python forum!
I've read quite a bit on how to extract data into a json file but the majority of the documentations found online will only save static data or data you yourself have added by hand.
I have decided to complicate my life a bit and use python to do my project since I had a raspberry pi lying around with a bluetooth I thought might as well....let me explain.
I'm using my Arduino to gather temperature data and via bluetooth send it to my pi.
#! /usr/bin/python
import serial
import datetime
ser = serial.Serial('/dev/rfcomm0' , 9600)
print(ser.name)
print("Connected")
while True:
now = datetime.datetime.now()
ser_bytes = ser.readline()
print (now.strftime("%Y-%m-%d %H:%M:%S, ")), ser_bytesEventually I'd like to load this into a database and make a plot that is visible on a website where the x is the time and y is the temperature.In order to achieve this first I have to somehow save whatever numbers I'm getting in the while function. My initial idea was to just save it as a txt file like this:
nohup python -u temp.py &This would work but eventually the file would get too big and probably not the nicest way to solve this problem, so I have to somehow limit the number of lines allowed in the database.
After a bit of research I found out saving it to CSV or JSON would be a lot more desirable but no documentation I've read so far uses the variables as inputs into the JSON or CSV file. I've done quite a few attempts but I was unsuccessful.
As I am new to this and got nobody else to ask I'd appreciate any help.
Sorry for an entry level question and thanks if you have read through it.
Sincerely,
Nyanpasu
RE: live updated json file - ndc85430 - Aug-22-2020
It would help to see how you're attempting to write the values into whatever file. It really shouldn't be that hard.
RE: live updated json file - Nyanpasu - Aug-22-2020
Managed to use lists instead and solve the issue. Now I can work with the data.