# Using exec node to graph real time data obtained from python script
**URL:** https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617
**Category:** General
**Created:** [30 March 2019 18:24 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617 "2019-03-30T18:24:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@climatedeniers](https://discourse.nodered.org/u/climatedeniers)
#### Post date: [30 March 2019 18:24 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617/1 "2019-03-30T18:24:29Z")
I have been attempting to graph data obtained from a python script using Node-RED. Whenever I attempt to deploy the nodes and inject the timestamp, I lose connection with Node-RED. Below is the python code:
* * *
import RPi.GPIO as GPIO
import time
import Adafruit\_MAX31855.MAX31855 as MAX31855
CLK1 = 16
DO1 = 20
CS1 = 21
sensor1 = MAX31855.MAX31855(CLK1, CS1, DO1)
CLK2 = 13
DO2 = 19
CS2 = 26
sensor2 = MAX31855.MAX31855(CLK2, CS2, DO2)
CLK3 = 23
DO3 = 24
CS3 = 25
sensor3 = MAX31855.MAX31855(CLK3, CS3, DO3)
CLK4 = 17
DO4 = 27
CS4 = 22
sensor4 = MAX31855.MAX31855(CLK4, CS4, DO4)
while True:
temp1 = sensor1.readTempC() - 1.25
temp2 = sensor2.readTempC()
temp3 = sensor3.readTempC()
temp4 = sensor4.readTempC()
```
print ('Thermocouple 1 Temperature: {0:0.3F}*C'.format(temp1))
time.sleep(2.0)
```
* * *
I am attempting to graph the variables temp1, temp2, temp3, and temp4 together on a real-time plot, but so far I have only tested trying to plot temp1.
My python file is saved in /home/pi/noderedthermocouple.py, and this is the exact line that I am inputting into the command blank in the properties of the exec node.
Also, if anyone has a better solution to graph the data from this python script using Node-RED, that would be greatly appreciated.
Thanks for your help.
---
### Author:  [@bohtho](https://discourse.nodered.org/u/bohtho)
#### Post date: [30 March 2019 19:45 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617/2 "2019-03-30T19:45:23Z")
I am not familiar with Python or if there’s a problem with the script but I use the daemon node ([node-red-node-daemon (node) - Node-RED](https://flows.nodered.org/node/node-red-node-daemon)) instead of the exec node for a long-running commandline java program. This node has some more options and its readme also has this tip:
> Some applications will automatically buffer lines of output. It is advisable to turn off this behaviour. For example, if running a Python app, the `-u` parameter will stop the output being buffered.
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [30 March 2019 20:30 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617/3 "2019-03-30T20:30:46Z")
Restart node-red and show us the log (starting from the welcome message) up to the point where it fails.
Also tell us exactly what happens when you "lose connection with node-RED".
---
### Author:  [@climatedeniers](https://discourse.nodered.org/u/climatedeniers)
#### Post date: [30 March 2019 20:44 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617/4 "2019-03-30T20:44:19Z")
Thank you both for replying, I decided to go a different route and use the pythonshell node and so far things are working.