Timer baseball feeder circuit

[DaveK]

I have a 3v dc motor that turns at a slow rpm. It has a rubber wheel
that comes in contact with a baseball. This allows the baseball to be
pushed in to a pitching machine. The ball waits in line to be driven
by the motor. I would like to be able to turn the motor on but have a
time delay of approximately 15 sec before it runs continuously. I will
have a limit switch to turn off the motor after the last ball has been
pitched. What type of circuit would be needed to produce this? I know
this is pretty basic but I’m very new to this. I can read schematics,
build circuits and have experience with electronic components but
having the proper circuit would make things very easy for me. Can some
one make a schematic that I can use to accomplish this? Any
information would greatly be appreciated. Thank you in advance for
your time.

Dave K

 

[John Fields]

On Thu, 14 Aug 2008 13:19:34 -0700 (PDT), DaveK <piscatory@cox.net>
wrote:

I have a 3v dc motor that turns at a slow rpm. It has a rubber wheel
that comes in contact with a baseball. This allows the baseball to be
pushed in to a pitching machine. The ball waits in line to be driven
by the motor. I would like to be able to turn the motor on but have a
time delay of approximately 15 sec before it runs continuously. I will
have a limit switch to turn off the motor after the last ball has been
pitched. What type of circuit would be needed to produce this? I know
this is pretty basic but I’m very new to this. I can read schematics,
build circuits and have experience with electronic components but
having the proper circuit would make things very easy for me. Can some
one make a schematic that I can use to accomplish this? Any
information would greatly be appreciated. Thank you in advance for
your time.

---
If you only have 3V available to do everything, this should work.
(View in Courier)

The timer is a CMOS 555, and if you can tell us how much current the
motor draws, one of us can select an appropriate MOSFET for Q1.

____
.. | <--O--+-----+-------+-------+-----+--O O--+
.. | | | | | |K S2 |
..3V>-----O S1 | | 8| | [1N4001] [MOTOR]
.. [100K] [1M] +---+---+ | | |
.. | | 2|_ Vcc _|4 | +--------+
.. +-----|--O|T R|O--+ |
.. | | 6| | | D
.. | +---|TH OUT|---|---G NCH
.. | | 7|_ |3 | S Q1
.. [100nF] +--O|D 7555| | |
.. | +| | GND | [10K] |
.. | [10ľf] +---+---+ | |
.. | | 1| | |
..GND>------------+-----+-------+-------+-----+

JF

 

[John Fields]

On Thu, 14 Aug 2008 17:00:26 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Thu, 14 Aug 2008 13:19:34 -0700 (PDT), DaveK <piscatory@cox.net
wrote:

I have a 3v dc motor that turns at a slow rpm. It has a rubber wheel
that comes in contact with a baseball. This allows the baseball to be
pushed in to a pitching machine. The ball waits in line to be driven
by the motor. I would like to be able to turn the motor on but have a
time delay of approximately 15 sec before it runs continuously. I will
have a limit switch to turn off the motor after the last ball has been
pitched. What type of circuit would be needed to produce this? I know
this is pretty basic but I’m very new to this. I can read schematics,
build circuits and have experience with electronic components but
having the proper circuit would make things very easy for me. Can some
one make a schematic that I can use to accomplish this? Any
information would greatly be appreciated. Thank you in advance for
your time.

---
If you only have 3V available to do everything, this should work.
(View in Courier)

The timer is a CMOS 555, and if you can tell us how much current the
motor draws, one of us can select an appropriate MOSFET for Q1.

____
. | <--O--+-----+-------+-------+-----+--O O--+
. | | | | | |K S2 |
.3V>-----O S1 | | 8| | [1N4001] [MOTOR]
. [100K] [1M] +---+---+ | | |
. | | 2|_ Vcc _|4 | +--------+
. +-----|--O|T R|O--+ |
. | | 6| | | D
. | +---|TH OUT|---|---G NCH
. | | 7|_ |3 | S Q1
. [100nF] +--O|D 7555| | |
. | +| | GND | [10K] |
. | [10ľf] +---+---+ | |
. | | 1| | |
.GND>------------+-----+-------+-------+-----+

---
Aaarghhh!!!

Jumped the gun on that one, sorry...

This one's right, I think.

S1 is the motor ON switch and S2 is the motor's limit switch, assuming
it's normally closed while the motor's running.


.. | <--O--+-----+-------+-------+---+----+
.. | | | | | | |
..3V>--O S1 | | 8| | | |
.. [100K] [1M] +---+---+ | [10k] |
.. | | 2|_ Vcc _|4 | | |
.. +-----|--O|T R|O--+ | |
.. | | 6| | | | S
.. | +---|TH OUT|---|---+--G PCH
.. | | 7|_ |3 | D Q1
.. [100nF] +--O|D 7555| | | ____
.. | +| | GND | [10K] +--O O--+
.. | [10ľf] +---+---+ | |K S2 |
.. | | 1| | [1N4001] [MOTOR]
.. | | | | | |
..GND>---------+-----+-------+-------+--------+--------+

The way it works is that as soon as S1 is made, the timer will output
a 15 second high-going pulse which will keep Q1 turned off.

Then, if S2 is made when the timer times out and pulls the gate of Q1
low, Q1 will switch on and allow charge to flow through the motor
until S2 opens.

When that happens, you'll need to open S1 before you load more balls
into the machine and override the limit switch.

Then, after the balls are loaded, to start the cycle anew, just turn
S1 ON.

About 15 seconds later it should start spitting out balls again.

JF

 

[DaveK]

On Aug 14, 3:34 pm, John Fields <jfie...@austininstruments.com> wrote:

On Thu, 14 Aug 2008 17:00:26 -0500, John Fields





jfie...@austininstruments.com> wrote:
On Thu, 14 Aug 2008 13:19:34 -0700 (PDT), DaveK <piscat...@cox.net
wrote:

I have a 3v dc motor that turns at a slow rpm. It has a rubber wheel
that comes in contact with a baseball. This allows the baseball to be
pushed in to a pitching machine. The ball waits in line to be driven
by the motor.  I would like to be able to turn the motor on but have a
time delay of approximately 15 sec before it runs continuously. I will
have a limit switch to turn off the motor after the last ball has been
pitched. What type of circuit would be needed to produce this? I know
this is pretty basic but I’m very new to this. I can read schematics,
build circuits and have experience with electronic components but
having the proper circuit would make things very easy for me. Can some
one make a schematic that I can use to accomplish this?  Any
information would greatly be appreciated. Thank you in advance for
your time.

---
If you only have 3V available to do everything, this should work.
(View in Courier)

The timer is a CMOS 555, and if you can tell us how much current the
motor draws, one of us can select an appropriate MOSFET for Q1.

                                               ____
.        | <--O--+-----+-------+-------+-----+--O  O--+
.        |       |     |       |       |     |K  S2   |
.3V>-----O S1    |     |      8|       |  [1N4001] [MOTOR]
.             [100K] [1M]  +---+---+   |     |        |
.                |     |  2|_ Vcc _|4  |     +--------+
.                +-----|--O|T     R|O--+     |
.                |     |  6|       |   |     D
.                |     +---|TH  OUT|---|---G NCH
.                |     |  7|_      |3  |     S Q1
.             [100nF]  +--O|D  7555|   |     |
.                |    +|   |  GND  | [10K]   |
.                |  [10ľf] +---+---+   |     |
.                |     |      1|       |     |
.GND>------------+-----+-------+-------+-----+

---
Aaarghhh!!!

Jumped the gun on that one, sorry...

This one's right, I think.  

S1 is the motor ON switch and S2 is the motor's limit switch, assuming
it's normally closed while the motor's running.

.     | <--O--+-----+-------+-------+---+----+            
.     |       |     |       |       |   |    |          
.3V>--O S1    |     |      8|       |   |    |            
.          [100K] [1M]  +---+---+   | [10k]  |            
.             |     |  2|_ Vcc _|4  |   |    |            
.             +-----|--O|T     R|O--+   |    |
.             |     |  6|       |   |   |    S
.             |     +---|TH  OUT|---|---+--G PCH
.             |     |  7|_      |3  |        D Q1
.          [100nF]  +--O|D  7555|   |        |  ____
.             |    +|   |  GND  | [10K]      +--O  O--+
.             |  [10ľf] +---+---+   |        |K  S2   |
.             |     |      1|       |    [1N4001]  [MOTOR]
.             |     |       |       |        |        |
.GND>---------+-----+-------+-------+--------+--------+

The way it works is that as soon as S1 is made, the timer will output
a 15 second high-going pulse which will keep Q1 turned off.

Then, if S2 is made when the timer times out and pulls the gate of Q1
low, Q1 will switch on and allow charge to flow through the motor
until S2 opens.

When that happens, you'll need to open S1 before you load more balls
into the machine and override the limit switch.

Then, after the balls are loaded, to start the cycle anew, just turn
S1 ON.

About 15 seconds later it should start spitting out balls again.

JF- Hide quoted text -

- Show quoted text -

JF,

Thank you so much for you response. There is nothing on the motor
indicating amp draw. It has many gears to deliver high torque which I
think lower the amp draw. The transformer puts out 3vdc at 500ma. I
hope that is enough info to pick out the correct MOSFET.

I took your schematic into WORD and used "courier new" because for
some reason plain courier was not an option, so in-turn the schematic
looks just like the one on this page. I have used schematics that were
sent to me awhile back and they worked out great in WORD. I must have
had the option of using courier instead of courier new.

I believed I could figure something out one way or another, unless you
have any suggestions. The way it is now I’m just not smart enough to
decipher it totally.

Thanks again for your prompt response

 

[John Fields]

On Thu, 14 Aug 2008 19:24:58 -0700 (PDT), DaveK <piscatory@cox.net>
wrote:

On Aug 14, 3:34 pm, John Fields <jfie...@austininstruments.com> wrote:
On Thu, 14 Aug 2008 17:00:26 -0500, John Fields

This one's right, I think.  

S1 is the motor ON switch and S2 is the motor's limit switch, assuming
it's normally closed while the motor's running.

.     | <--O--+-----+-------+-------+---+----+            
.     |       |     |       |       |   |    |          
.3V>--O S1    |     |      8|       |   |    |            
.          [100K] [1M]  +---+---+   | [10k]  |            
.             |     |  2|_ Vcc _|4  |   |    |            
.             +-----|--O|T     R|O--+   |    |
.             |     |  6|       |   |   |    S
.             |     +---|TH  OUT|---|---+--G PCH
.             |     |  7|_      |3  |        D Q1
.          [100nF]  +--O|D  7555|   |        |  ____
.             |    +|   |  GND  | [10K]      +--O  O--+
.             |  [10ľf] +---+---+   |        |K  S2   |
.             |     |      1|       |    [1N4001]  [MOTOR]
.             |     |       |       |        |        |
.GND>---------+-----+-------+-------+--------+--------+

The way it works is that as soon as S1 is made, the timer will output
a 15 second high-going pulse which will keep Q1 turned off.

Then, if S2 is made when the timer times out and pulls the gate of Q1
low, Q1 will switch on and allow charge to flow through the motor
until S2 opens.

When that happens, you'll need to open S1 before you load more balls
into the machine and override the limit switch.

Then, after the balls are loaded, to start the cycle anew, just turn
S1 ON.

About 15 seconds later it should start spitting out balls again.

JF- Hide quoted text -

- Show quoted text -

JF,

Thank you so much for you response. There is nothing on the motor
indicating amp draw. It has many gears to deliver high torque which I
think lower the amp draw. The transformer puts out 3vdc at 500ma. I
hope that is enough info to pick out the correct MOSFET.

I took your schematic into WORD and used "courier new" because for
some reason plain courier was not an option, so in-turn the schematic
looks just like the one on this page. I have used schematics that were
sent to me awhile back and they worked out great in WORD. I must have
had the option of using courier instead of courier new.

I believed I could figure something out one way or another, unless you
have any suggestions. The way it is now I’m just not smart enough to
decipher it totally.

Thanks again for your prompt response

---
You're welcome.

The schematic is just an ASCII representation of a graphic schematic.

Perhaps this'll help:

..     | <--O--+-----+-------+-------+---+----+            
..     |       |     |       |       |   |    |          
..3V>--O S1    |R1   |R2    8|       |   |R4  |            
..          [100K] [1M]  +---+---+   | [10k]  |            
..             |     |  2|_ Vcc _|4  |   |    |            
..             +-----|--O|T     R|O--+   |    |
..             |     |  6|       |   |   |    S
..             |     +---|TH  OUT|---|---+--G FDP4020P
..             |C1   |  7|_      |3  |        D Q1
..          [100nF]  +--O|D   |   |R3      |  ____
..             |    +|   |  GND  | [10K]      +--O  O--+
..             |  [10ľf] +---+---+   |        |K  S2   |
..             |     |C2    1| U1    |    [1N4001]  [MOTOR]
..             |     |       | 7555  |      D1|        |
..GND>---------+-----+-------+-------+--------+--------+


JF

 

[John Fields]

A Fairchild FDC604P is a better choice for Q1:

http://www.fairchildsemi.com/sitesearch/fsc.jsp?command=text&attr1=FDC604P&attr2=&t=0&i=sitemap+id&ia=1&text=FDC604P&as=1&render=1&w=


..     | <--O--+-----+-------+-------+---+----+            
..     |       |     |       |       |   |    |          
..3V>--O S1    |R1   |R2    8|       |   |R4  |            
..          [100K] [1M]  +---+---+   | [10k]  |            
..             |     |  2|_ Vcc _|4  |   |    |            
..             +-----|--O|T     R|O--+   |    |
..             |     |  6|       |   |   |    S
..             |     +---|TH  OUT|---|---+--G FDC604P
..             |C1   |  7|_      |3  |        D Q1
..          [100nF]  +--O|D   |   |R3      |  ____
..             |    +|   |  GND  | [10K]      +--O  O--+
..             |  [10ľf] +---+---+   |        |K  S2   |
..             |     |C2    1| U1    |    [1N4001]  [MOTOR]
..             |     |       | 7555  |      D1|        |
..GND>---------+-----+-------+-------+--------+--------+

---
If you want to see how it works you can get a free copy of LTspice
from:

http://www.linear.com/designtools/software/switchercad.jsp

and run this:

Version 4
SHEET 1 880 864
WIRE -304 160 -544 160
WIRE -224 160 -304 160
WIRE -128 160 -224 160
WIRE -16 160 -128 160
WIRE 352 160 -16 160
WIRE 448 160 352 160
WIRE -224 192 -224 160
WIRE -128 192 -128 160
WIRE 448 192 448 160
WIRE -544 208 -544 160
WIRE -592 224 -720 224
WIRE 96 240 48 240
WIRE 352 240 352 160
WIRE 352 240 320 240
WIRE -128 304 -128 272
WIRE 96 304 -128 304
WIRE 448 304 448 272
WIRE 448 304 320 304
WIRE -304 352 -304 160
WIRE -224 368 -224 272
WIRE -224 368 -256 368
WIRE 96 368 -224 368
WIRE 448 368 448 304
WIRE 448 368 320 368
WIRE -16 432 -16 160
WIRE 96 432 -16 432
WIRE -304 464 -304 448
WIRE -304 464 -400 464
WIRE -128 464 -128 304
WIRE 352 464 352 240
WIRE 448 464 448 368
WIRE -720 480 -720 224
WIRE -544 480 -544 288
WIRE -16 480 -16 432
WIRE -304 512 -304 464
WIRE -400 528 -400 464
WIRE -720 624 -720 560
WIRE -592 624 -592 272
WIRE -592 624 -720 624
WIRE -544 624 -544 560
WIRE -544 624 -592 624
WIRE -400 624 -400 592
WIRE -400 624 -544 624
WIRE -304 624 -304 592
WIRE -304 624 -400 624
WIRE -128 624 -128 528
WIRE -128 624 -304 624
WIRE -16 624 -16 560
WIRE -16 624 -128 624
WIRE 48 624 48 240
WIRE 48 624 -16 624
WIRE 352 624 352 528
WIRE 352 624 48 624
WIRE 448 624 448 528
WIRE 448 624 352 624
WIRE -720 704 -720 624
FLAG -720 704 0
SYMBOL Misc\\NE555 208 336 R0
SYMATTR InstName U2
SYMBOL cap 432 464 R0
SYMATTR InstName C1
SYMATTR Value 10e-6
SYMBOL diode -384 592 R180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL pmos -256 448 R180
SYMATTR InstName M1
SYMATTR Value FDC638P
SYMBOL res 432 176 R0
SYMATTR InstName R2
SYMATTR Value 1e6
SYMBOL res -144 176 R0
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL cap -144 464 R0
SYMATTR InstName C2
SYMATTR Value 100e-9
SYMBOL voltage -544 464 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 3
SYMBOL voltage -720 464 R0
WINDOW 0 -53 5 Left 0
WINDOW 3 -242 110 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 .1 1E-6 1E-6)
SYMBOL sw -544 304 M180
WINDOW 0 32 15 Left 0
WINDOW 3 32 44 Left 0
SYMATTR InstName S1
SYMBOL res -32 464 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 336 464 R0
SYMATTR InstName C3
SYMATTR Value 100e-9
SYMBOL res -240 176 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL ind -320 496 R0
SYMATTR InstName L1
SYMATTR Value .1
SYMATTR SpiceLine Rser=6
TEXT -688 648 Left 0 !.tran 20
TEXT -688 680 Left 0 !.model SW SW(Ron=1 Roff=10Meg Vt=0.5Vh=0)

JF