Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Stephen Shaw
On Sun, Oct 7, 2012 at 8:52 PM, Michael Torrie wrote: > On 10/07/2012 08:39 PM, Ryan Byrd wrote: >>> I have only one power supply. It's called a battery. I cannot add a >>> second battery. This is on a vehicle. >> >> well... you could get a dc-dc converter that takes 12v in and outputs >> 24v,

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Michael Torrie
On 10/07/2012 08:52 PM, Michael Torrie wrote: >> Another option is to use an 12->120v inverter and then use a computer >> power supply. ATX, for example, has +/- 12 volt outputs: >> http://jwenet.net/notebook/2005/1161.html > > Hmm, sounds complicated. > > Will give it some thought. Actually the

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Hugh Clark
Perhaps I don't fully understand the problem, but couldn't you use an H-bridge to control the motor (only needing 1 DC power supply) and an ADC on the Arduino to measure the position? The code in the Arduino would provide the basic feedback loop allowing you to set rough ADC values from the pot fo

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Michael Torrie
On 10/08/2012 11:36 AM, Hugh Clark wrote: > Perhaps I don't fully understand the problem, but couldn't you use an > H-bridge to control the motor (only needing 1 DC power supply) and an ADC > on the Arduino to measure the position? The code in the Arduino would > provide the basic feedback loop al

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread justin
I've noticed a strong correlation between bottom posting and judging others for not bottom posting. Top posting helps eliminate this problem. Just saying... ;) --j On Mon, Oct 8, 2012 at 10:57 AM, Michael Torrie wrote: > > [1] I've noticed a strong correlation between top-posting and not > rea

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Michael Torrie
On 10/08/2012 12:30 PM, justin wrote: > I've noticed a strong correlation between bottom posting and judging > others for not bottom posting. Top posting helps eliminate this > problem. Just saying... > > ;) Ahh the memories. Good times. /* PLUG: http://plug.org, #utah on irc.freenode.net Unsub

Re: definitely OT now :)

2012-10-08 Thread Michael Torrie
On 10/08/2012 12:46 PM, Michael Torrie wrote: > On 10/08/2012 12:30 PM, justin wrote: >> I've noticed a strong correlation between bottom posting and judging >> others for not bottom posting. Top posting helps eliminate this >> problem. Just saying... >> >> ;) > > Ahh the memories. Good times. A

Re: definitely OT now :)

2012-10-08 Thread Richard Esplin
I think the prospect of a Canadian winter has Michael feeling feisty. On Monday October 8 2012 12:53:17 Michael Torrie wrote: > On 10/08/2012 12:46 PM, Michael Torrie wrote: > > On 10/08/2012 12:30 PM, justin wrote: > >> I've noticed a strong correlation between bottom posting and judging > >> ot

Re: definitely OT now :)

2012-10-08 Thread justin
On Mon, Oct 8, 2012 at 11:53 AM, Michael Torrie wrote: > On 10/08/2012 12:46 PM, Michael Torrie wrote: >> On 10/08/2012 12:30 PM, justin wrote: >>> I've noticed a strong correlation between bottom posting and judging >>> others for not bottom posting. Top posting helps eliminate this >>> problem.

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Shane Hathaway
On 10/08/2012 11:57 AM, Michael Torrie wrote: > On 10/08/2012 11:36 AM, Hugh Clark wrote: >> Perhaps I don't fully understand the problem, but couldn't you use an >> H-bridge to control the motor (only needing 1 DC power supply) and an ADC >> on the Arduino to measure the position? The code in the

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Nicholas Leippe
Why not just use a mechanical switch at each position, put some capacitance in the input circuit for hysteresis/debouncing, and use relays to control direction? /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Michael Torrie
On 10/08/2012 01:30 PM, Shane Hathaway wrote: > The large current requirement (10A) and the need for a middle position > make the circuit interesting and difficult to achieve using low cost > analog components. An analog H bridge would work well if you only > needed 2 positions. You can't dump

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Shane Hathaway
On 10/08/2012 02:03 PM, Michael Torrie wrote: > On 10/08/2012 01:30 PM, Shane Hathaway wrote: >> The large current requirement (10A) and the need for a middle position >> make the circuit interesting and difficult to achieve using low cost >> analog components. An analog H bridge would work well i

Re: slightly OT, need some electronic circuit help

2012-10-08 Thread Michael Torrie
On 10/08/2012 03:18 PM, Shane Hathaway wrote: > Ok, it seems like you want 2 op-amps wired as comparators. One op amp > decides whether to move the motor forward, the other decides whether to > move it backward. (You can get multiple op-amps on a chip, so this > doesn't increase the parts coun

Meeting this Wednesday at 7:30pm -- FreeSWITCH

2012-10-08 Thread Steve Meyers
Date: Wednesday, October 10th, 2012 Time: 7:30 PM Location: C7 Data Centers (Lindon) Tod Hansmann will be presenting on FreeSWITCH. The goal is a small office setup. We will be going over the following, as this is very intro level, and FreeSWITCH is incredibly vast: - FS architecture - A brie