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On 2/21/2012 3:28 AM, Roy Coates wrote:
<blockquote
cite="mid:CAPe297Y4RoJSMTpgLS0ZQ_PR6tcvFLveNFZbLB3XvPxKjeu4NA@mail.gmail.com"
type="cite"><br>
The signal you (and the boards) are interested in is between the
wiper and the ground pin. The voltage on the wiper will vary from
the supply voltage (on your + pin) and the ground pin.<br>
<br>
So, wire your supply voltage to the + pin.<br>
wire your - pin to the ground.<br>
Take a wire from the wiper to the input of your plasma board.<br>
<br>
Roy.<br>
<br>
<br>
<div class="gmail_quote">On 21 February 2012 06:24, <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:dabigboy@cox.net">dabigboy@cox.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Alright, got
a little dilemma here, hoping someone can help. I am wiring up
this Gables nav head for my sim, and the left side of the
frequency selector (the 108-117) uses a bunch of resistors to
determine frequency....basically, there are two signal pins.
Resistance between those pins is varied depending on frequency
selection. "Great!" methinks, "I can just wire this into a
joystick axis and voila!" Old gameport joysticks just use two
wires, so it should be OK, right? Well, apparently my
controller (a Beta Innovations Plasma V2) REQUIRES the ground
terminal of the pot to be connected.<br>
<br>
It appears to me that all the ground pot does is provide a
"reference" voltage, ergo, the max resistance of the pot. The
Plasma manual says you hook the wiper terminal of the pot to
any analog input, then hook the other two terminals (+ and -)
to any common voltage and common ground terminal,
respectively. A pot measures its max resistance between the +
and - terminals, all the time....so, I tried using resistors
to equal the max resistance of the resistor pack on the Gables
unit, and wire that to a common negative and common positive
terminal on the Plasma. It did not work.<br>
<br>
How would I go about wiring this up? I don't really understand
why the Plasma (and Bodnar board, for that matter) "need" the
pots grounded to even just have the axis show up and move a
little. Or is it that the Plasma needs to see the resistance
between the wiper and ground be the INVERSE of the resistance
going to the analog input? If that is the case, I'm not sure
how I can make this work........<br>
<br>
Matt<br>
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</blockquote>
Roy you are right that how a pot works but Mat is going down the
wrong road.<br>
1. Gables heads use ARINC410<br>
2. They do not generate a voltage, frequency or anything else.<br>
3. They are a 5 bit device not 8<br>
4. They are LOW active. I have not looked at yours but the
resistors are pull up. <br>
5. to show you self whats going on get 5 leds and wire them to the
channel (one led per bit) the other end to power. (check to see
which way your led goes and remember to use a 220 ohm resister in
series with the led to limit its current and not burn out) <br>
6. Freq selector common to logic ground<br>
7. now watch the leds as you rotate the knob.. <br>
<br>
also send me your pdf and I will look at it for you...<br>
<a class="moz-txt-link-abbreviated" href="mailto:harrison@phoenixaerospace.us">harrison@phoenixaerospace.us</a><br>
<br>
<br>
Cris.<br>
<br>
<br>
<br>
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