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
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
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
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?
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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
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.
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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
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
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
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
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,
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, like this
> http://www.jameco.com/webapp/wcs/stores/servlet/
> 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, like this
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_155695_-1
then, with 24v you co
On 10/07/2012 07:47 PM, Ryan Byrd wrote:
>> Any ideas on how to get negative volts? I have only one power source...
> 12V positive.
>
> Just add another 12v DC power supply and you're good to go. Most op amps have
> a wide input operating voltages.
> See:
> http://www.sciencelobby.com/operati
>Any ideas on how to get negative volts? I have only one power source...
12V positive.
Just add another 12v DC power supply and you're good to go. Most op amps have a
wide input operating voltages.
See:
http://www.sciencelobby.com/operational-amplifier/opamp-dual-power-supplies.html
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On 10/07/2012 12:32 AM, Ryan Byrd wrote:
>> However it does not specify what sort of op amps to use. I am unsure
>> how to translate the schematic into a working circuit with real parts.
>> Also I don't know how to choose the resistor values.
>
> this page:
> https://sites.google.com/site/cmunsf
I know many of you guys are electronics geniuses as well as linux gurus.
I need a very simple circuit and despite searching the internet I
haven't found any real good recipes, except one rough schematic that I
will present here.
Basically I have a simple linear actuator (12 V) with a built-in
pot
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