Relay circuit for toy

In article
<4dc44cdf$0$4429$e4fe514c@dreader28.news.xs4all.nl>,
petrus.bitbyter@hotmail.com says...

[snip]

Minimum guaranteed operation voltage of a CMOS 555 depends on the
manufacturer. Some say 3V, others 1.5V. A problem may arise for the
dimensions of the timing capacitor. I did not calculate it (yet) but you may
need a >100uF capacitor which has to fit in the available space.
Click to expand...
According to one on-line calculator,
R1=20k, R2=1M and C=47uF gives values
just over 30s off and on.

Still not *tiny*, but smaller...
 
emetzger wrote:
Randy,
Thank you for the response, but Im not familiar with electronics. I
have no idea what you sent or how to hook a relay timer to this toy.
Is there a 30 second or close to relay timer I can purchase and solder
on to this toy? It needs to be run off the small battery in the unit
or double A- 9 volt battery.
Click to expand...
If you are that unfamiliar with electronics you won't even be able to do the
kind of soldering needed.

Stop trying to modify it. Just leave that thing alone, buy some kits from
solarbotics.com and learn something from them first.


--

Reply in group, but if emailing add one more
zero, and remove the last word.
 
"Randy Day" <randy.day@sasktel.netx> schreef in bericht
news:MPG.282e802b20454309896a1@aioe.org...
In article
4dc44cdf$0$4429$e4fe514c@dreader28.news.xs4all.nl>,
petrus.bitbyter@hotmail.com says...

[snip]

Minimum guaranteed operation voltage of a CMOS 555 depends on the
manufacturer. Some say 3V, others 1.5V. A problem may arise for the
dimensions of the timing capacitor. I did not calculate it (yet) but you
may
need a >100uF capacitor which has to fit in the available space.

According to one on-line calculator,
R1=20k, R2=1M and C=47uF gives values
just over 30s off and on.

Still not *tiny*, but smaller...
Click to expand...
Well, maybe it'll fit, especially when using SMD-components. Though I
suppose a course on soldering electronic components especially (again) SMD
ones has to be added :)

petrus bitbyter
 
"Randy Day" <randy.day@sasktel.netx> schreef in bericht
news:MPG.282e7c38129c0b89896a0@aioe.org...
In article <tni8s6l0uprs9jld4i38244ppo9ea93acf@4ax.com>,
bbew.ar@mapson.nozirev.ten says...

[snip]

As was noted somewhere else on the thread, though, enough capacitance to
run a 30 sec on - 30 sec off cycle with a 555 would probably make the
entire package far too large.

Something that might work -- not mentioned earlier for fear of scaring
the OP away too soon -- would be a little 6- or 8-pin SOIC
microcontroller running off of an internal clock. That, an SOT-23
transistor, and similar catch diode for the motor could probably all be
squeezed into the available space with a little creativity.

Yabbut, isn't there an unwritten rule that
whoever suggests a micro has to supply the
source code?

/wide-eyed innocence> :)
Click to expand...
At the time I also had this feeling. Calling "use a PIC" seemed to be the
solution for every problem. Of course on it's own that yell did not solve a
thing. Providing a usefull sourcecode on the other hand means you to have to
design about 80% or more of the solution. The problem as you know it that
is, as too often the OP does provide enough information to make a relevant
design specification. That's why I only gave some general hints in this case
and did not start to draw or calculete something.

petrus bitbyter
 
On May 6, 2:36 pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote:
On Fri, 6 May 2011 11:32:08 -0700 (PDT), George Herold





gher...@teachspin.com> wrote:
On May 4, 9:52 pm, George Herold <gher...@teachspin.com> wrote:
On May 4, 5:11 pm, emetzger <emetzger1...@yahoo.com> wrote:

On May 4, 11:53 am, George Herold <gher...@teachspin.com> wrote:

On May 3, 9:39 pm, emetzger <emetzger1...@yahoo.com> wrote:> I have a toy bug that when turned on it vibrates and walkes around
like a live bug. I am interested in putting some sort of time relay
that will run it for 30 seconds and shut it off for 30 seconds. Can
someone suggest a relay timer that I can purchase for this and where I
can solder it onto the unit. I will probably run it with 2 double A
batteries. Thank you for your help.

(snip picutres)

Those little bugs run off a few button cells. (I think).
The vibrator is like those in cell phones.
Do you picture the timer riding on top of the bug?
I don't think it will work very well if you load it down with a
9 volt battery and a relay.

The first thing you might do is measure how much current the vibrator
draws.

George H.

Thank you guys for the help. The main reason I want a time relay is to
conserve batterys and peak my cats interest.  I wasn't sure If a relay
would run off the small battery that is already in it. I know nothing
about electronics, was just hoping someone could tell me to buy a
specific timer and solder wire A to pin B.

Thanks,
Erik- Hide quoted text -

- Show quoted text -

Yeah the first thing to do is buy three more, so you can break some
and still have one left for the cat.

Then take one apart and see how the circuit works.  Do you have a
cheap DMM?  Less than $10.

I don't think there are any 'tab A in slot B' answers to your
question.

George H.- Hide quoted text -

- Show quoted text -

DMM is a digital multi meter.  You can use it to measure voltage,
current, resistance, and sometimes other things.  It would be a good
first piece of electronics test gear.  You could use it to measure the
battery voltage and current in your circuit.  I think the problem you
will have is not very much voltage.  With only 3 volts or so it might
be hard to make a 555 timer circuit work.  (I think?)

National's CMOS version is spec'd down to 1.5 V and they are available
in some pretty small packages.

As was noted somewhere else on the thread, though, enough capacitance to
run a 30 sec on - 30 sec off cycle with a 555 would probably make the
entire package far too large.

Something that might work -- not mentioned earlier for fear of scaring
the OP away too soon -- would be a little 6- or 8-pin SOIC
microcontroller running off of an internal clock. That, an SOT-23
transistor, and similar catch diode for the motor could probably all be
squeezed into the available space with a little creativity.

--
Rich Webb     Norfolk, VA
Rich,
Click to expand...
Thank you for the post. The timer can be bigger than the unit. I'm
hiding it under objects for the cat to find. I want it to buzz and
then cut off, then buzz again. It doesn't have to walk around. If I
bought a 555, where do I solder the exsisting wires on the unit to get
it to cut on and off at roughly 30 seconds?
Thanks,
Erik
 
On Sun, 8 May 2011 06:09:03 -0700 (PDT), emetzger
<emetzger1974@yahoo.com> wrote:

On May 6, 2:36 pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote:
On Fri, 6 May 2011 11:32:08 -0700 (PDT), George Herold





gher...@teachspin.com> wrote:
On May 4, 9:52 pm, George Herold <gher...@teachspin.com> wrote:
On May 4, 5:11 pm, emetzger <emetzger1...@yahoo.com> wrote:

On May 4, 11:53 am, George Herold <gher...@teachspin.com> wrote:

On May 3, 9:39 pm, emetzger <emetzger1...@yahoo.com> wrote:> I have a toy bug that when turned on it vibrates and walkes around
like a live bug. I am interested in putting some sort of time relay
that will run it for 30 seconds and shut it off for 30 seconds. Can
someone suggest a relay timer that I can purchase for this and where I
can solder it onto the unit. I will probably run it with 2 double A
batteries. Thank you for your help.

(snip picutres)

Those little bugs run off a few button cells. (I think).
The vibrator is like those in cell phones.
Do you picture the timer riding on top of the bug?
I don't think it will work very well if you load it down with a
9 volt battery and a relay.

The first thing you might do is measure how much current the vibrator
draws.

George H.

Thank you guys for the help. The main reason I want a time relay is to
conserve batterys and peak my cats interest.  I wasn't sure If a relay
would run off the small battery that is already in it. I know nothing
about electronics, was just hoping someone could tell me to buy a
specific timer and solder wire A to pin B.

Thanks,
Erik- Hide quoted text -

- Show quoted text -

Yeah the first thing to do is buy three more, so you can break some
and still have one left for the cat.

Then take one apart and see how the circuit works.  Do you have a
cheap DMM?  Less than $10.

I don't think there are any 'tab A in slot B' answers to your
question.

George H.- Hide quoted text -

- Show quoted text -

DMM is a digital multi meter.  You can use it to measure voltage,
current, resistance, and sometimes other things.  It would be a good
first piece of electronics test gear.  You could use it to measure the
battery voltage and current in your circuit.  I think the problem you
will have is not very much voltage.  With only 3 volts or so it might
be hard to make a 555 timer circuit work.  (I think?)

National's CMOS version is spec'd down to 1.5 V and they are available
in some pretty small packages.

As was noted somewhere else on the thread, though, enough capacitance to
run a 30 sec on - 30 sec off cycle with a 555 would probably make the
entire package far too large.

Something that might work -- not mentioned earlier for fear of scaring
the OP away too soon -- would be a little 6- or 8-pin SOIC
microcontroller running off of an internal clock. That, an SOT-23
transistor, and similar catch diode for the motor could probably all be
squeezed into the available space with a little creativity.

--
Rich Webb     Norfolk, VA
Rich,
Thank you for the post. The timer can be bigger than the unit. I'm
hiding it under objects for the cat to find. I want it to buzz and
then cut off, then buzz again. It doesn't have to walk around. If I
bought a 555, where do I solder the exsisting wires on the unit to get
it to cut on and off at roughly 30 seconds?
Thanks,
Erik
Click to expand...
This *might* work, assuming that the motor is a really low current
device. Using an intermediate transistor switch driven by pin 3 would
probably be better.

.----------o---o-----------------------------.
| | | |
| | | |
| | | .------o-----------o
.-. .---o---o---. | | |
| | | 4 6 | | | |
22K | | | | | .--o--. |
'-' | | - | | |
| | | ^ |MOTOR| |
o------o 7 | | | | | +
| | | | '--o--' ---
.-. | | | | -
| | | 3 o------o------' | -
470K | | | | 1N4148 |
'-' | | |
| | | |
o------o 6 | |
o------o 2 | |
| | 1 5 | |
--- '--o----o---' |
--- | | |
| 100u | | |
| | --- |
| | --- 0.01u |
| | | |
| | | |
| | | |
'---------o----o-----------------------------'
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

--
Rich Webb Norfolk, VA
 
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