Shaking Relays

Archiver

Hi everyone,

I've made a program to read in 3 switch values and the status of the
switches determines how the output pins must be.

PIN 0=switch 1
PIN 1=switch 2
PIN 2=switch 3
PIN 4=output 1
PIN 5=output 2
PIN 6=output 3

I programmed my BS2P-24 as following:

low 4
low 5
low 6

main:
inA=outB
goto main

---

I use a ULN-2003A to amp. the voltage also the current. With this voltage I
control 3 relays. The problem is that the relays start to shake when I
download the program into my controller. I guess that the command brings the
outputs very short on a 0 status even when my input voltage is 5V. Does
anybody have an idea to solve my program so the relays won't shake anymore.

Kindly regards,

Tim


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

When you reprogram the BASIC Stamp the I/O pins are reset to inputs -- this
is what's causing your relays to chatter until you make relay control pins
outputs and low. What you can do to prevent the chatter is connect 10K
pull-down
resistors to the relay-control pins. These will hold the inputs to the
ULN2003 low until your Stamp program makes a change to a pin's output state.

-- Jon Williams
-- Parallax


In a message dated 6/17/2003 8:55:17 AM Central Standard Time,
peter.christiaen@s... writes:

> Hi everyone,
>
> I've made a program to read in 3 switch values and the status of the
> switches determines how the output pins must be.
>
> PIN 0=switch 1
> PIN 1=switch 2
> PIN 2=switch 3
> PIN 4=output 1
> PIN 5=output 2
> PIN 6=output 3
>
> I programmed my BS2P-24 as following:
>
> low 4
> low 5
> low 6
>
> main:
> inA=outB
> goto main
>
>

---

>
> I use a ULN-2003A to amp. the voltage also the current. With this voltage I
> control 3 relays. The problem is that the relays start to shake when I
> download the program into my controller. I guess that the command brings the
> outputs very short on a 0 status even when my input voltage is 5V. Does
> anybody have an idea to solve my program so the relays won't shake anymore.
>
> Kindly regards,
>
> Tim



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

June 17, 2002 I am not exactly sure what you mean by shake, but I ran into a
problem once when I tried to operate four relays at the same time. When I
operated them sequentially there was no problem. When I tried to turn them on at
the same time they would all chatter ( turn off and on very quickly). The
problem was fixed by going to a more powerful power supply, one that was capable
of running the Stamp & relays & LED without dropping its voltage. I hope that
helps. Larry

---

Original Message

---

From: TLD-NV [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=mGobMPxXtTTxJvLjX2fMAY_mTcbkXc_RzU2ndDROUCIVdM13nEUdHkFSdM1eAed7S54yKfTf80BSUbQwjhqLIP3WMQ]peter.christiaen@s...[/url
Sent: Tuesday, June 17, 2003 8:52 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Shaking Relays


Hi everyone,

I've made a program to read in 3 switch values and the status of the
switches determines how the output pins must be.

PIN 0=switch 1
PIN 1=switch 2
PIN 2=switch 3
PIN 4=output 1
PIN 5=output 2
PIN 6=output 3

I programmed my BS2P-24 as following:

low 4
low 5
low 6

main:
inA=outB
goto main

---

I use a ULN-2003A to amp. the voltage also the current. With this voltage I
control 3 relays. The problem is that the relays start to shake when I
download the program into my controller. I guess that the command brings the
outputs very short on a 0 status even when my input voltage is 5V. Does
anybody have an idea to solve my program so the relays won't shake anymore.

Kindly regards,

Tim


[noparse][[/noparse]Non-text portions of this message have been removed]


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