How to add another trace to a plotly graph?

1

Hi all,

I have a python script running to output room temperatures from my Evohome heating system to a Plotly graph, which works beautifully using the following code:

# We make a plot for every room
for device in client.temperatures():
    stream_id = Config.get('Rooms', device['id'])
    stream = Stream(token=stream_id,
        maxpoints=288
    )
    trace1 = Scatter(
           x=[],
           y=[],
           mode='lines+markers',
           line=Line(
               shape='spline'
               ),
           stream = stream
           )

    data = Data([trace1])
    layout = Layout(title=device['name'])
    fig = Figure(data=data, layout=layout)
    py.plot(fig, filename=device['name'], fileopt='extend')

# Infinite loop every 5 minutes, send temperatures to plotly
while True:

# Get current time and then send all thermostat readings to plotly
    try:
        client = EvohomeClient(USERNAME, PASSWORD)
        from datetime import datetime
        j=0
        for device in client.temperatures():
            stream_id = Config.get('Rooms', device['id'])
            j+=1
            s = py.Stream(stream_id)
            s.open()
            tijd = datetime.now().strftime('%Y-%m-%d %H:%M')
            temperatuur = float(device['temp'])
            print tijd + " : " + device['name'] + " " + str(temperatuur)
            s.write(dict(x=tijd ,y=temperatuur))
            s.close()
        print "Going to sleep for 5 minutes"
        time.sleep(300)
    except Exception, e:
        print "An error occured! Trying again in 15 seconds"
        print str(e)
        time.sleep(15)

As you can see, the existing trace is plotting “device[‘temp’]”. I’d like to add a second trace to the same axes which plots "device[‘setpoint’]. The code to extract the information from the Honeywell servers is working fine, I just can’t get the code to add another trace to the Plotly graphs.

Struggling to get it to work, any help appreciated!

Thanks,

Gareth

2

Hi, so you need to create a new traces (ie: trace2) for this data, along with a unique stream id for each trace in the initial for loop.
Then in the second for loop, you would have to write information to these additional stream ids as well.

3

Hi garmcqui ,
Did you manage to achieve this ? Any config you could share please as I’m looking at doing the same with my Evohome.
Thanks