Single PS problem
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Posts: 46,084
It's my understanding that the ground of both supplies should be
connected to each other.
Rus
mhilt1@t... wrote:
> Can anyone tell me why i can only get things to work with my basic
> stamp when i use one common power supply. I first noticed this when
> i had built a simple dc motor control circuit, which i had drawing
> power from a separte power source than the basic stamp. I could
> never get it working. But when i connected the motors to the same
> power supply as the stamp, it worked fine. This was not so much a
> problem because the stamps 9v battery was accessible to the motors.
> But my latest adventure has me using two wireless rf modules made by
> Linx. Again, i was able to get the system to work perfectly when the
> componants are all supplied by the same battery, but when i put the
> transmitter( attached to my computers serial port) on its own 9v
> battery, and the reciever on the 9v battery of the stamp, it wouldn't
> work. This is very confusing to me. Like i said, i was able to get
> the system to transmit and recieve fine if the transmitter and
> reciever were powered by the same battery. Any help would be greatly
> appreciated. Thanks.
>
> matt
--
Rus Hardy
"Lucky Devil"
Keeper of the Bucky-n-Thrifty Flame
http://www.boneyardbargains.com/
"my mind wanders....I'm just along for the ride"
connected to each other.
Rus
mhilt1@t... wrote:
> Can anyone tell me why i can only get things to work with my basic
> stamp when i use one common power supply. I first noticed this when
> i had built a simple dc motor control circuit, which i had drawing
> power from a separte power source than the basic stamp. I could
> never get it working. But when i connected the motors to the same
> power supply as the stamp, it worked fine. This was not so much a
> problem because the stamps 9v battery was accessible to the motors.
> But my latest adventure has me using two wireless rf modules made by
> Linx. Again, i was able to get the system to work perfectly when the
> componants are all supplied by the same battery, but when i put the
> transmitter( attached to my computers serial port) on its own 9v
> battery, and the reciever on the 9v battery of the stamp, it wouldn't
> work. This is very confusing to me. Like i said, i was able to get
> the system to transmit and recieve fine if the transmitter and
> reciever were powered by the same battery. Any help would be greatly
> appreciated. Thanks.
>
> matt
--
Rus Hardy
"Lucky Devil"
Keeper of the Bucky-n-Thrifty Flame
http://www.boneyardbargains.com/
"my mind wanders....I'm just along for the ride"
Comments
stamp when i use one common power supply. I first noticed this when
i had built a simple dc motor control circuit, which i had drawing
power from a separte power source than the basic stamp. I could
never get it working. But when i connected the motors to the same
power supply as the stamp, it worked fine. This was not so much a
problem because the stamps 9v battery was accessible to the motors.
But my latest adventure has me using two wireless rf modules made by
Linx. Again, i was able to get the system to work perfectly when the
componants are all supplied by the same battery, but when i put the
transmitter( attached to my computers serial port) on its own 9v
battery, and the reciever on the 9v battery of the stamp, it wouldn't
work. This is very confusing to me. Like i said, i was able to get
the system to transmit and recieve fine if the transmitter and
reciever were powered by the same battery. Any help would be greatly
appreciated. Thanks.
matt
good. The reciever is on a robot, which i'm trying to communicate
with via my computer wirelessly.
mhilt1@t... writes:
> It does work when the grouds are connected, but this does me no
> good. The reciever is on a robot, which i'm trying to communicate
> with via my computer wirelessly.
Hi Matt,
I'm using a similar type setup using the BS2 with linx hp modules and Motor Mind
B. Are you using a stamp at the transmitter and a stamp at the receiver? My
system uses a BS2 to send info to the the linx transmitter and a BS2 to receive
the info from the linx receiver....
Jerry
Original Message
From: <mhilt1@t...>
To: <basicstamps@egroups.com>
Sent: Thursday, August 10, 2000 5:30 PM
Subject: [noparse][[/noparse]basicstamps] Re: Single PS problem
> It does work when the grouds are connected, but this does me no
> good. The reciever is on a robot, which i'm trying to communicate
> with via my computer wirelessly.
>
> I like the sound of your project, as I'm currently looking at a small
robot which works almost the same as yours. Why is connecting the grounds no
good to you, you said it works and both motors and BSII are running of
diffrent supply voltages. Can you also email the address for the TX/RX pair
that your using.
Thanks, and good luck
John.
>
>
>
Original Message
From: <mhilt1@t...>
To: <basicstamps@egroups.com>
Sent: Thursday, August 10, 2000 5:30 PM
Subject: [noparse][[/noparse]basicstamps] Re: Single PS problem
> It does work when the grouds are connected, but this does me no
> good. The reciever is on a robot, which i'm trying to communicate
> with via my computer wirelessly.
>
> I like the sound of your project, as I'm currently looking at a small
robot which works almost the same as yours. Why is connecting the grounds no
good to you, you said it works and both motors and BSII are running of
diffrent supply voltages. Can you also email the address for the TX/RX pair
that your using.
Thanks, and good luck
John.
>
>
>
connected to the computers ground, not just to the battery's cathode. I'm
using linx transmitters and recievers, specifically the lc series. You can
get them direct from their daughter company rfdigital at rfdigital.com. The
problem with these is that they are surface mount devices. You can get the
same product from a company called glolab, who uses the smd's in an easy to
use pcb. For these goto www.glolab.com.
ground connected to the serial ports ground, rather than just the 9v
battery. Something about the logic devices, i don't know. My particular
project uses a pc to transmit data to my robot. Or any serial device for
that matter ( i have it working with my palm pilot too). What i meant by
connecting the grounds being no good was that i need to have the robot free
from the computer, or in this case the tx. I may have misinterpreted people
when they said "connect the grounds". At any rate, its working. Thanks for
your help.
matt
>I was able to get the system working. It turns out i needed the transmitter
>ground connected to the serial ports ground, rather than just the 9v
>battery. Something about the logic devices, i don't know.
Just for the record:
Connect ALL grounds in any one (or multiple) system(s) [noparse][[/noparse]in one location]
together, for a common ground plane/path. This not only provides the ( - )
connectivity, but aides in implementing various sorts of supression systems
(noise, EMI, cross-talk, etc) when coupled to the other onboard systems
appropriately.
> My particular
>project uses a pc to transmit data to my robot. Or any serial device for
>that matter ( i have it working with my palm pilot too). What i meant by
>connecting the grounds being no good was that i need to have the robot free
>from the computer, or in this case the tx. I may have misinterpreted people
>when they said "connect the grounds". At any rate, its working. Thanks for
>your help.
>
>matt
Bruce Bates