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mark.supinski(at)gmail.co
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 Posted: Thu Sep 03, 2009 7:00 am Post subject: 200 ohm pullup |
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Hi everyone-
I'm trying to wire my fuel level sender to the device that displays the level. I have a simple float-based fuel level sender with 180-degree sweep & 40-240 ohm resistance. There is a single terminal post at the back of the sender to hook it up to a display. I am told that I need a 200ohm pullup to connect it to the device. The fuel sender input for the device is +5v.
I've trolled the web to find out what a pullup is. What I haven't found is whether I can buy a discrete IC to use for this purpose, or if I need to breadboard something. Also, I presume I will need some sort of component to take +12 bus voltage and step it down to +5v as the input to the pullup.
Is there an easy way to accomplish this (where easy = go to radio shack & buy X) or do I have to build something to accomplish it.
Thanks,
Mark
[quote][b]
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bob(at)bob-white.com
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| Posted: Thu Sep 03, 2009 7:40 am Post subject: 200 ohm pullup |
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Hi Mark,
The 200 ohm pull up is just a resistor. There is a 5 volt source from
your EC2 that can be used to power it. Pin 11, which may also be
connected to your air input temp sensor depending on how old the unit
is.
Bob W.
On Thu, 3 Sep 2009 08:58:19 -0600
"Mark R. Supinski" <mark.supinski(at)gmail.com> wrote:
| Quote: | Hi everyone-
I'm trying to wire my fuel level sender to the device that displays the
level. I have a simple float-based fuel level sender with 180-degree sweep
& 40-240 ohm resistance. There is a single terminal post at the back of the
sender to hook it up to a display. I am told that I need a 200ohm pullup to
connect it to the device. The fuel sender input for the device is +5v.
I've trolled the web to find out what a pullup is. What I haven't found is
whether I can buy a discrete IC to use for this purpose, or if I need to
breadboard something. Also, I presume I will need some sort of component to
take +12 bus voltage and step it down to +5v as the input to the pullup.
Is there an easy way to accomplish this (where easy = go to radio shack &
buy X) or do I have to build something to accomplish it.
Thanks,
Mark
|
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/
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bob(at)bob-white.com
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| Posted: Thu Sep 03, 2009 8:25 am Post subject: 200 ohm pullup |
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Scratch the comment about the EC2. The 5 V source is pins 11 or 24 on
P2 of the EM2, or if you have an EM3, TB1-12 or TB4-16.
Connect the resistor between 5V and the level sender. Connect that
junction to the input. Max power dissipation in the resistor will be
less than 1/8 watt, so a 1/4 or 1/2 watt resistor will be OK. Don't
expect it to be real linear.
Bob W.
On Thu, 3 Sep 2009 09:34:21 -0600
Bob White <bob(at)bob-white.com> wrote:
| Quote: |
Hi Mark,
The 200 ohm pull up is just a resistor. There is a 5 volt source from
your EC2 that can be used to power it. Pin 11, which may also be
connected to your air input temp sensor depending on how old the unit
is.
Bob W.
On Thu, 3 Sep 2009 08:58:19 -0600
"Mark R. Supinski" <mark.supinski(at)gmail.com> wrote:
> Hi everyone-
>
> I'm trying to wire my fuel level sender to the device that displays the
> level. I have a simple float-based fuel level sender with 180-degree sweep
> & 40-240 ohm resistance. There is a single terminal post at the back of the
> sender to hook it up to a display. I am told that I need a 200ohm pullup to
> connect it to the device. The fuel sender input for the device is +5v.
>
> I've trolled the web to find out what a pullup is. What I haven't found is
> whether I can buy a discrete IC to use for this purpose, or if I need to
> breadboard something. Also, I presume I will need some sort of component to
> take +12 bus voltage and step it down to +5v as the input to the pullup.
>
> Is there an easy way to accomplish this (where easy = go to radio shack &
> buy X) or do I have to build something to accomplish it.
>
> Thanks,
>
> Mark
>
|
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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