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google / OctoPrint-LEDStripControl

OctoPrint plugin that intercepts M150 GCode commands and controls local GPIOs connected to LEDs.
Apache License 2.0
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Problem with gpio group #1

Closed pettib closed 7 years ago

pettib commented 7 years ago

I´m testing your project and had a working Octoprint. But when after running "usermod -G gpio pi" it stops to work. It can´t connect to the printer. Error message: Changing monitoring state from 'Operational' to 'Offline' Changing monitoring state from 'Offline' to 'Detecting serial port' Serial port list: ['/dev/ttyACM0'] Connecting to: /dev/ttyACM0 Error while connecting to /dev/ttyACM0: 'Timeout' Changing monitoring state from 'Detecting serial port' to 'Error: Failed to autodetect serial port, please set it manually.' Failed to autodetect serial port, please set it manually. Connection closed, closing down monitor

I tried it with two different octoprint installations and both gave me the same result. I´m not so good at Linux to find this out, just that it has something with rights to do.

Maby it should be: usermod -G -a gpio pi

precision commented 7 years ago

Ack, I'm sorry about that. Totally right, I somehow missed the -a, fixed #ac56ce7b53226c5225d86ff9335a8d6a6e8cf149

precision commented 7 years ago

You should be able to restore the defaults with a 'usermod -a -G sudo, dialout,video pi'

pettib commented 7 years ago

Thanks for clarifying. :-) Can you tell me witch MOSFets you are using to control the Ledstrip from gpio. I tried with 30N06L but they are built to work with 5v logic so they wont work. Need to find some that work nice with 3.3v logic.

thatch commented 7 years ago

Hi pettib, I'm the board designer. It has DNM3023L (SOT-23 ~6A N-Channel) on it, but it depends on how much current draw your strip needs. precision's strip draws about 300mA, so this is much more than we need. I also went surface-mount to keep things small. These are about 38 cents each from digikey.

Did you try your 30N06L though? Since you're only driving say 1A, given the V_GS_th of 1.0 to 2.5V I think it's possible that it will work on 3.3 without overheating. Note Figure 3 in the datasheet and extrapolate another curve the same distance to the top-left. I suspect the y-intercept will only be about 40 or 50 mOhm.