[EMS Discuss] HIgher current H-Bridge and circuit help
Sun Apr 7 02:48:23 PDT 2013
If you do go the relay route I think you will need both, one for each direction.
My gut reaction is to go h-bridge, however. Here is one that looks good, shipped from within the states, for $6.35.
> I have a dual relay that I am not sure if it will work or not, never used
> relays before actually... here's a link to one similar to it:
> On Sat, Apr 6, 2013 at 11:12 AM, Taper Wickel <EMAIL HIDDEN> wrote:
>> My quick reaction is to go with relays -- and on consideration, that
>> original switch is probably just a DPDT wired with each "throw" inverted.
>> Er, reading that back, maybe this page will make things clearer:
>> What you lose, compared to an H-bridge, is the capacity for speed control,
>> but in this application it doesn't sound vital.
>> Hope this helps!
>> Taper Wickel <EMAIL HIDDEN>
>> Hi all!
>> I hope someone may be able to help me to decide what direction to take a
>> project that semi-works but doesn't complete the goal set out.
>> I have a chicken door opening mechanism built using an electronic
>> screwdriver powered from 4 AA batteries, it has a spool on the driver area
>> and it winds up a rope that pulls up the door through a pulley system. The
>> switch on the screwdriver is a weird type that throws both negative and
>> positive at once and then reverses that for the other direction, thereby
>> avoiding the need for any IC or control. The way we operate it is to hold
>> the button while the door goes up or down and release it when it is in the
>> correct spot. This all works fine and has been in place for a while.
>> However now that it gets light earlier I have built a circuit that will
>> automatically open the door when it gets light. It uses an H-Bridge to
>> control the motor instead of the direct connection to the batteries as
>> before, which worked great in testing with a motor with no load on it,
>> however once I built it all and tried to put it in place the current of the
>> H-Bridge(600ma) was not enough to open the door at more than a snails pace.
>> My question is: should I continue to look for another higher amperage (to
>> let all the juice from the batteries through would be a much higher
>> amperage, like 1 amp)H-Bridge with a similar pinout layout or try to use
>> relays to switch it, or try to use some transistors to do it?
>> Thanks for any help!
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