I have built a very simple circuit that attaches to a horseshoe pitching glove. It consists of a 9v battery, red led and turns on when two bare wires close the circuit when the leads, one on the finger and one on the thumb, cause the led to go off when the shoe is released. I would like to somehow reverse when the led goes on and off. I would like to add a component(s) that causes the led to go ON when continuity is broken, instead of going OFF. Can anyone recommend a simple design. I am assuming that I will also need a small ON/OFF switch to turn off the LED when not in use. Thanks for any help. Please be specific about any component and how to wire it.
Photon713 wrote: > I have built a very simple circuit that attaches to a horseshoe > pitching glove. It consists of a 9v battery, red led and turns on > when two bare wires close the circuit when the leads, one on > the finger and one on the thumb, cause the led to go off when > the shoe is released. I would like to somehow reverse when > the led goes on and off. I would like to add a component(s) > that causes the led to go ON when continuity is broken, > instead of going OFF. Can anyone recommend a simple > design. I am assuming that I will also need a small ON/OFF > switch to turn off the LED when not in use. Thanks for any > help. Please be specific about any component and how to wire > it.
> Again, thanks...
Google for "inverter". Find a schematic, follow the instructions.
Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html
> Photon713 wrote: >> I have built a very simple circuit that attaches to a horseshoe >> pitching glove. It consists of a 9v battery, red led and turns on >> when two bare wires close the circuit when the leads, one on >> the finger and one on the thumb, cause the led to go off when >> the shoe is released. I would like to somehow reverse when >> the led goes on and off. I would like to add a component(s) >> that causes the led to go ON when continuity is broken, >> instead of going OFF. Can anyone recommend a simple >> design. I am assuming that I will also need a small ON/OFF >> switch to turn off the LED when not in use. Thanks for any >> help. Please be specific about any component and how to wire >> it.
>> Again, thanks...
> Google for "inverter". Find a schematic, follow the instructions.
> Do you need to implement control loops in software? > "Applied Control Theory for Embedded Systems" gives you just what it says. > See details at http://www.wescottdesign.com/actfes/actfes.html
On Thu, 24 Jul 2008 00:21:24 GMT, "Photon713" <bobr...@verizon.net> wrote:
>I have built a very simple circuit that attaches to a horseshoe >pitching glove. It consists of a 9v battery, red led and turns on >when two bare wires close the circuit when the leads, one on >the finger and one on the thumb, cause the led to go off when >the shoe is released. I would like to somehow reverse when >the led goes on and off. I would like to add a component(s) >that causes the led to go ON when continuity is broken, >instead of going OFF. Can anyone recommend a simple >design. I am assuming that I will also need a small ON/OFF >switch to turn off the LED when not in use. Thanks for any >help. Please be specific about any component and how to wire >it.
>Again, thanks...
What, no resistor? That's runing the risk of frying the LED.
Thanks John...that looks simple enough...just what I need. Couldn't find anything about an inverter that did anything other than convert DC to AC. Appreciate the help...
-- __________ lvMMMCCIX
"John Larkin" <jjlar...@highNOTlandTHIStechnologyPART.com> wrote in message
>>I have built a very simple circuit that attaches to a horseshoe >>pitching glove. It consists of a 9v battery, red led and turns on >>when two bare wires close the circuit when the leads, one on >>the finger and one on the thumb, cause the led to go off when >>the shoe is released. I would like to somehow reverse when >>the led goes on and off. I would like to add a component(s) >>that causes the led to go ON when continuity is broken, >>instead of going OFF. Can anyone recommend a simple >>design. I am assuming that I will also need a small ON/OFF >>switch to turn off the LED when not in use. Thanks for any >>help. Please be specific about any component and how to wire >>it.
>>Again, thanks...
> What, no resistor? That's runing the risk of frying the LED.
> Photon713 wrote: >> I have built a very simple circuit that attaches to a horseshoe >> pitching glove. It consists of a 9v battery, red led and turns on >> when two bare wires close the circuit when the leads, one on >> the finger and one on the thumb, cause the led to go off when >> the shoe is released. I would like to somehow reverse when >> the led goes on and off. I would like to add a component(s) >> that causes the led to go ON when continuity is broken, >> instead of going OFF. Can anyone recommend a simple >> design. I am assuming that I will also need a small ON/OFF >> switch to turn off the LED when not in use. Thanks for any >> help. Please be specific about any component and how to wire >> it.
...
> Google for "inverter". Find a schematic, follow the instructions.
** So the OP will wind up building a switching PSU circuit - right ?
>I have built a very simple circuit that attaches to a horseshoe > pitching glove. It consists of a 9v battery, red led and turns on > when two bare wires close the circuit when the leads, one on > the finger and one on the thumb, cause the led to go off when > the shoe is released. I would like to somehow reverse when > the led goes on and off. I would like to add a component(s) > that causes the led to go ON when continuity is broken, > instead of going OFF. Can anyone recommend a simple > design. I am assuming that I will also need a small ON/OFF > switch to turn off the LED when not in use. Thanks for any > help. Please be specific about any component and how to wire > it.
When switch closes led will be short circuited and will go off.
The down side of doing it this way is that the battery will always have a load of ~10mA on it, a high efficiency LED could extend the battery life as they need a lower current. The up side is its simple - don't forget to disconnect battery when not in use.
In sunlight outdoors a clear (plastic lens) LED may be better than a tinted one as you will definitely know its on if you can see the red colour.
Phil Allison wrote: > "Tim Wescott >> Photon713 wrote: >>> I have built a very simple circuit that attaches to a horseshoe >>> pitching glove. It consists of a 9v battery, red led and turns on >>> when two bare wires close the circuit when the leads, one on >>> the finger and one on the thumb, cause the led to go off when >>> the shoe is released. I would like to somehow reverse when >>> the led goes on and off. I would like to add a component(s) >>> that causes the led to go ON when continuity is broken, >>> instead of going OFF. Can anyone recommend a simple >>> design. I am assuming that I will also need a small ON/OFF >>> switch to turn off the LED when not in use. Thanks for any >>> help. Please be specific about any component and how to wire >>> it.
> ... >> Google for "inverter". Find a schematic, follow the instructions.
> ** So the OP will wind up building a switching PSU circuit - right ?
> Do be careful about ambiguity in terminology.
> ...... Phil
Yea, yea -- I seem to have suffered from inadequate imagination.
If done right it could be used to light up _lots_ of LEDs, though.
Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html
Photon713 wrote: > Thanks John...that looks simple enough...just what I need. > Couldn't find anything about an inverter that did anything other > than convert DC to AC. Appreciate the help...
I think the intention was "logic inverter"! Google for SN74LS04 hex inverter IC
Photon713 wrote: > I have built a very simple circuit that attaches to a horseshoe > pitching glove. It consists of a 9v battery, red led and turns on > when two bare wires close the circuit when the leads, one on > the finger and one on the thumb, cause the led to go off when > the shoe is released. I would like to somehow reverse when > the led goes on and off. I would like to add a component(s) > that causes the led to go ON when continuity is broken, > instead of going OFF. Can anyone recommend a simple > design. I am assuming that I will also need a small ON/OFF > switch to turn off the LED when not in use. Thanks for any > help. Please be specific about any component and how to wire > it.
> Again, thanks...
Look up a 555 timer circuit and use the RESET line to hold the LED on. the timer will be configed as Astable.
