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1  Community / Gigs and Collaborations / Gig: Board Drafter for Simple Arduino PID control and pwm output design on: September 12, 2012, 10:02:27 am
Hopefully I'm posting this in an acceptable sub-forum.

I am looking for an individual with experience drafting circuit boards who could create the drawings needed to have a board printed for a prototype.  I have a rough wiring diagram and a working prototype based, but would like to move to an integrated circuit board through a fab house like expressPCB or 4PCB.  Current design utilizes a Teensy Arduino and serial display and drives 3 servos.  PDF showing wiring diagram & Current Code can be sent for review, comments would be appreciated.

Please PM me if interested & have similar experience. Willing to pay for services rendered.
2  Using Arduino / Project Guidance / Re: Emergency Shutdown Power Source on: August 17, 2012, 07:58:14 am
Thanks for this, I think im going to avoid the lipo batteries though as they tend to fail over a long period of time, I intend for this project to rarely need the backup power and only need power for about 1/2 second to shut down.  I'm going to try and build the supercap circuit and see how that goes, it seems to be the cleanest solution i can find.
3  Using Arduino / Project Guidance / Re: Emergency Shutdown Power Source on: August 15, 2012, 09:22:43 am
Quote
For powering it, no. The Arduino shouldn't be powering the servo, anyway.
  What would be the correct method for powering the servos?  can it still be pulling power from the same plug power source so long as its rated for sufficient amperage just not through the +5V off the arduino?  This project will be stationary with a wall wart plug. 

Thanks,
4  Using Arduino / Project Guidance / Emergency Shutdown Power Source on: August 15, 2012, 08:29:27 am
Hi,

Apologies as I'm fairly new to electronics work.

I'm trying to figure out a good way to have a project turn a servo in the case of a power failure and run through a really quick 3 signal shutdown sequence.  I'm currently thinking this would require battery backup and a charging circuit, but I'm curious if anyone has worked with maybe a capacitor circuit that would be simpler to just send a write and power a servo to a specific position if the main board power were to fail.

Thanks for any thoughts.

I've found this: http://ruggedcircuits.com/html/circuit__13.html
using a "Super Capacitor" which seems like a simpler method than battery backup.  I'm not sure if 35 ma for 3 seconds would be enough to power a servo.
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