Quick and dirty script for plotting the JSON output of rtl_433

temp_plot.py

from pylab import *
from drawnow import drawnow, figure
import random
import time
import fileinput
import json
import datetime

sensors = []
values = {}

def draw_fig():
    for s in sensors:
        vals = values[s]
        plot_date(vals["time"],vals["val"],".-")
    legend(sensors)

for line in fileinput.input():
    vals = json.loads(line)
    if "temperature_C" not in vals:
        continue
    
    t = datetime.datetime.fromisoformat(vals["time"])
    mid = vals["model"]+" "+str(vals["id"])
    if "channel" in vals:
        mid += "_"+str(vals["channel"])
    if "rid" in vals:
        mid += "_"+str(vals["rid"])

    if mid not in sensors:
        sensors.append(mid)
        values[mid]={"time":[],"val":[]}
    values[mid]["time"].append(t)
    values[mid]["val"].append(vals["temperature_C"])
    #print(values)
    drawnow(draw_fig)