numat / mfc Goto Github PK

@patrickfuller

I'm trying to control my MFC using a Raspberry Pi4. I'm able to establish a connection with the MFC, .get( ) function is working, and so is .set_gas( ). But when I try to change the actual flowrate with .set( ), .open( ), or .close( ), I'm getting errors.

When I try to use .set( ) on the command line I get: Could not connect to device
When I try to use it in a script I get:
RuntimeError: Event loop is closed
Unclosed client session
Unclosed connector

Am I missing some sort of previous configuration on the MFC? I'm pretty lost here, so any help is welcome!
Thanks in advance!

Sorry, this isn't an issue, just a question. I was wondering how to switch between analog and digital control. On my 'plot' tab, there are analog & digital radio buttons. I have both analog control and the ethernet cable hooked up, and I switch between the 2 depending on how I want to control. Looking through your code, you talk about checking for analog control and switching to digital - is that what I need or something different? At some point, you mentioned "analog over digital", which doesn't sound like what I have - my analog comes through the 9 pin dsub.

Am I looking for something like this line?
await self._request('flow_setpoint_html', 'mfc.sp_adc_enable=0')

This library is overkill for the driver, especially because flow controllers don't need millisecond-level control (the mechanical response time on the controller is ~100ms).

By constructing the frames ourselves, we can remove the dependency and simplify the install process.

The current approach blocks, taking time away from the controller OS. After implementing #1, we should be able to integrate this driver with an async framework (e.g. tornado, asyncio, twisted).

@patrickfuller
.set(##.#) function is returning NoneType in python script? I can get it to work in command line but is there a way to use .set() within a python script? I am trying to set the flow controller to a particular setpoint but would like to do it in a script.

Thanks for your help!