# Processing.py and Arduino connection
**URL:** https://discourse.processing.org/t/processing-py-and-arduino-connection/20026
**Category:** Processing.py
**Created:** [April 22, 2020, 9:40am UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026 "2020-04-22T09:40:44Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Bodo29](https://discourse.processing.org/u/Bodo29)
#### Post date: [April 22, 2020, 9:40am UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/1 "2020-04-22T09:40:44Z")
Hi,
I’m brand new here in this forum and also in using processing.
So first: English is not my first language. Sorry for any mistakes or misunderstandings.
I’ve got the following problem while trying to use an Arduino Uno with processing:
My OS is Windows 10, the Arduino is connected via USB to COM1 and running the Standard Firmata, I#M using the processing IDE in Python mode.
I am not able to connect to the Arduino in Python mode. An example:
**in Java mode:**
```auto
import processing.serial.*;
Serial myPort; // Create object from Serial class
int val; // Data received from the serial port
void setup()
{
size(200, 200);
myPort = new Serial(this, "COM1", 57600);
}
void draw()
{
}
```
**that works fine.**
**Now in Python mode:**
```auto
add_library('serial')
add_library('arduino')
def setup():
a = Arduino(this, "COM1", 57600)
def draw():
pass
```
**ends with a mistake:**
> UnsatisfiedLinkError: jssc.SerialNativeInterface.openPort(Ljava/lang/String;Z)J
> at jssc.SerialNativeInterface.openPort(Native Method)
> at jssc.SerialPort.openPort(SerialPort.java:158)
> at processing.serial.Serial.(Unknown Source)
> at processing.serial.Serial.(Unknown Source)
> at cc.arduino.Arduino.(Arduino.java:159)
**and so on.**
What is wrong here? I think it is a problem with the serial library in Python mode.
Can anybody help me?
---
### Author:  [@tabreturn](https://discourse.processing.org/u/tabreturn)
#### Post date: [April 22, 2020, 9:52am UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/2 "2020-04-22T09:52:17Z")
“… Deleting windows32\jSSC-2.8.dll works perfectly …”
>
>
> It looks like processing is using incorrect dll search path on a 64bit architecture.
> Following code fails.
> add\_library('serial')
> from java.lang import System
> System.loadLibrary("jSSC-2.8") #the native...
---
### Author:  [@Bodo29](https://discourse.processing.org/u/Bodo29)
#### Post date: [April 23, 2020, 8:38am UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/3 "2020-04-23T08:38:52Z")
Thank you very much, **tabreturn**.
Great, it works.
It was a little bit tricky because I didn’t know exactly what was meant and what I should do.
The path to find the .dll was **c:\programs (x86)\processing-3.5.4\modes\java\libraries\serial\library\windows32** and it was difficult for a beginner to find that. 😇 😇
After deleting the .dll everything works fine.
---
### Author:  [@villares](https://discourse.processing.org/u/villares)
#### Post date: [April 25, 2020, 4:05pm UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/4 "2020-04-25T16:05:52Z")
Yeah! This is terrible for beginners, It bothers me so much!
From time to time I try to find someone with skills to fix this 😕
I’m glad you made it work! Now see if you can [play with some potentiometers](https://github.com/villares/lousa-magica/)!
---
### Author:  [@mpsftw](https://discourse.processing.org/u/mpsftw)
#### Post date: [April 27, 2020, 1:00pm UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/5 "2020-04-27T13:00:19Z")
I have a fix in for this. I believe it’s in build 3058. I can only test Windows in a VM, so please let me know if you continue to see it.
---
### Author:  [@villares](https://discourse.processing.org/u/villares)
#### Post date: [April 27, 2020, 2:41pm UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/6 "2020-04-27T14:41:58Z")
Wow! That is **great news** I don’t have access to Windows right now, but I’ll have a look ASAP!
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [May 3, 2020, 5:25pm UTC](https://discourse.processing.org/t/processing-py-and-arduino-connection/20026/7 "2020-05-03T17:25:35Z")
> [@mpsftw](#):
>
> I believe it’s in build 3058
Thank you so much, @mpsftw !
That’s correct – currently if you install Python mode from Processing PDE you will see a 3058+ build including [that Windows fix](https://github.com/jdf/processing.py/commit/3267891a64e3393aec9c13c5c35756dddc1b7adf). I just tried, and PDE installed [3059](https://github.com/jdf/processing.py/releases/tag/3059).