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by CAP_Cadet
Wed Mar 05, 2014 8:44 pm
Forum: General discussion
Topic: SOLVED: Separate GNDs for Different Voltages?
Replies: 7
Views: 2446

Re: Separate GNDs for Different Voltages?

Thanks for all your help everybody. I went with what was on my schematic and it is working well. :D
I will be posting my latest project's overview next week.
Thanks again!

For those who want to know the solution: Keep your RPi grounding separate from your higher-voltage line's grounding.
by CAP_Cadet
Wed Mar 05, 2014 7:52 pm
Forum: General discussion
Topic: SOLVED: Separate GNDs for Different Voltages?
Replies: 7
Views: 2446

Re: Separate GNDs for Different Voltages?

Schematic as promised.

@rpdom you are exactly right.

edit: the relay is in open mode

Image
by CAP_Cadet
Wed Mar 05, 2014 6:00 pm
Forum: General discussion
Topic: SOLVED: Separate GNDs for Different Voltages?
Replies: 7
Views: 2446

Re: Separate GNDs for Different Voltages?

Thanks for the quick replies.
The GPIO pins are using a transistor to control a 5V signal (from the Pi) to switch a 5V relay which turns on/off the 12V strip. I'll put up a schematic in a bit.

Thanks again for the help.
by CAP_Cadet
Wed Mar 05, 2014 5:32 pm
Forum: General discussion
Topic: SOLVED: Separate GNDs for Different Voltages?
Replies: 7
Views: 2446

SOLVED: Separate GNDs for Different Voltages?

Hello, I am using my Pi's GPIO to control some 12V lighting strips (LED). Can I just ground the GPIO connection to the 12V supply's ground? Or do I have to keep the RPi's connection grounded back to the board? I have heard that using 12V to GND 3.3V can create negative voltage, but I don't know. Tha...
by CAP_Cadet
Thu Feb 20, 2014 5:41 pm
Forum: General discussion
Topic: good power supply for graphical application to fit behind TV
Replies: 2
Views: 380

Re: good power supply for graphical application to fit behin

Are you using any peripherals, and if so, are you using a USB hub with them? Once I get your answer I can comment better on a supply. In general, a 5V 1Amp mini-USB supply works well enough. I'm running a pretty heavy project, so I juice the Pi from a powered hub connected to the Pi using a 5V 2.1Am...
by CAP_Cadet
Wed Feb 19, 2014 6:33 pm
Forum: Beginners
Topic: Battery regulator
Replies: 1
Views: 315

Re: Battery regulator

I've looked around and didn't find anything good. However, you could use a cheap mini Ammeter--since charge is dictated by amperage. Add an ammeter (analog is cheapest) in line with the battery and you could see your charge.
Hope this helps!
by CAP_Cadet
Wed Feb 19, 2014 6:14 pm
Forum: Automation, sensing and robotics
Topic: Linear Actuator for Door Lock Demo
Replies: 30
Views: 13363

Re: Linear Actuator for Door Lock Demo

This might be a little more than what you're looking for, but MAKE has:
http://makezine.com/projects/make-34/th ... -actuator/

You could also use some sort of screw drive, with an interface to a drill motor, but that would cost more.
Hope this helps!
by CAP_Cadet
Mon Feb 17, 2014 10:54 pm
Forum: Automation, sensing and robotics
Topic: Remote Cronjobs?
Replies: 2
Views: 464

Re: Remote Cronjobs?

Thanks Ivan- I will start research into it and working on that. Your help is greatly appreciated :D
by CAP_Cadet
Mon Feb 17, 2014 4:18 pm
Forum: Automation, sensing and robotics
Topic: Remote Cronjobs?
Replies: 2
Views: 464

Remote Cronjobs?

Hi all,

I am working on an automation project using Cron. Is it possible to schedule cronjobs over the Internet? I would like to receive input from a website to schedule a cronjob to run a python script (that turns on lighting over GPIO). Any ideas/suggestions are appreciated.

Thanks

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