# Pigpio commands into NodeRed
**URL:** https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221
**Category:** General
**Created:** [11 August 2019 15:25 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221 "2019-08-11T15:25:49Z")
**Posts on this page:** 15
**Page:** 1
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 15:25 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/1 "2019-08-11T15:25:49Z")
Hello,
I'm looking for a way to insert following terminal commands into NodeRed:
sudo pigpiod
python
import pigpio
pi=pigpio.pi()
pi.hardware\_PWM(12, 25000, 1e6\ ***0.25** ) # 25000Hz 25% dutycycle(normaly)
The whole thing is a fan control and the **0.25** are the duty cycle and should be infinitely adjustable.
Can someone help me plz?
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [11 August 2019 15:34 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/2 "2019-08-11T15:34:04Z")
Hi,
a) you can't (easily) run a command as sudo as that is a security privilege escalation. so you need to run pigpiod outside of Node-RED. However once you have done that then
b) there is a node-red-node-pi-gpiod that can drive it for most use cases - [https://flows.nodered.org/node/node-red-node-pi-gpiod](https://flows.nodered.org/node/node-red-node-pi-gpiod)
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 15:49 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/3 "2019-08-11T15:49:12Z")
Hi,
i know this node but i have to run it with the 25khz and there is no option to change it.
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 16:37 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/4 "2019-08-11T16:37:04Z")
If the pigpiod daemon is running then you might be able to set the frequency by calling your exec node using this (not tried but worth a go)
```auto
import pigpio
pi=pigpio.pi()
set_PWM_frequency(12, 25000)
```
NB pigpio doesn't let you choose any frequency value
but is the fan really that sensitive to the frequency?
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 16:39 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/5 "2019-08-11T16:39:51Z")
Hi,
thanks.
And yes, they are^^
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 17:39 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/6 "2019-08-11T17:39:55Z")
seem not to work.
Another idea:
A Pythonscript with a variable (DutyCycle), but also there I do not know yet really how I should convert it...
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 18:24 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/7 "2019-08-11T18:24:14Z")
Just checking - what physical pin is your fan connected to
Node-RED uses physical pin numbers so if your connected to pin 12 then you need to use
```auto
set_PWM_frequency(18, 25000)
```
as physical pin 12 is gpio number 18
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 19:03 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/8 "2019-08-11T19:03:17Z")
Just tried it out on a PiZero and it seems to work - with correct syntax that is 🙂
I created a file called fred.py
and stuck this in it
```auto
import pigpio
pi=pigpio.pi()
pi.set_PWM_frequency(18, 25000)
```
And injected value of 25 into the pigpio node
I've put an LED on the pin and it glowed as expected
I then changed the fred.py to
```auto
import pigpio
pi=pigpio.pi()
pi.set_PWM_frequency(18, 5)
```
and this time the LED blinked rapidly
So I think that proves the concept is good 🙂
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 19:23 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/9 "2019-08-11T19:23:39Z")
Well it doesn't work for me. I get the following error message from exec:
```auto
11.8.2019, 21:22:47node: ac7e4461.29989msg.payload : string[0]
""
11.8.2019, 21:22:47node: ac7e4461.29989msg.payload : string[144]
"Traceback (most recent call last):↵ File "/home/pi/scripts/test.py", line 2, in ↵ import pigpio↵ImportError: No module named pigpio↵"
11.8.2019, 21:22:47node: ac7e4461.29989
msg.payload : Object
{ code: 1, message: "Command failed: python /home/p…" }
```
pigpio is runnig cause pigs hp 12 25000 500000 works but the python part dont.
```auto
>>> import pigpio
Traceback (most recent call last):
File "", line 1, in
ImportError: No module named pigpio
```
I'm a bit confused
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 19:33 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/10 "2019-08-11T19:33:17Z")
Do you get same error if your run
python /home/pi/scripts/test.py
from plain terminal command line?
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 19:34 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/11 "2019-08-11T19:34:45Z")
yes
```auto
pi@octopi:~ $ python /home/pi/scripts/test.py
Traceback (most recent call last):
File "/home/pi/scripts/test.py", line 2, in
import pigpio
ImportError: No module named pigpio
```
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 19:47 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/12 "2019-08-11T19:47:09Z")
That IS wierd ☹
Luckily you can directly call pigs
(My LED is on pin 12 - gpio 18)
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 19:51 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/13 "2019-08-11T19:51:33Z")
Hello,
yeah, that's what I'm playing with right now.
All I have to do now is figure out how to get a number from the inject block into the output.
So I would have to
pigs have hp 12 25000 500000 where the 50000 should come from an input.
---
### Author:  [@cymplecy](https://discourse.nodered.org/u/cymplecy)
#### Post date: [11 August 2019 19:57 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/14 "2019-08-11T19:57:21Z")
You can use incoming msg.payload and get it added onto the end 🙂
Just make sure to add the space at the end
---
### Author:  [@Gummix](https://discourse.nodered.org/u/Gummix)
#### Post date: [11 August 2019 20:04 UTC](https://discourse.nodered.org/t/pigpio-commands-into-nodered/14221/15 "2019-08-11T20:04:40Z")
> [@Gummix](#):
>
> pigs hp 12 25000 500000
Ah ok, Thanks it works xD