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richardhughes260(at)yahoo
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 Posted: Mon Jan 09, 2006 8:18 am Post subject: Blind encoder Display |
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My ACK encoder was out of adjustment by 400 plus feet.
Yesterday morning, I soldered tohgether a board with a
resistor and 9 diodes. If you have the time to wait
for shipping get the RST item in the link.
(http://www.rst-engr.com/rst/catalog/altitude encoder and elt.html)
It displays the data lines coming out of the encoder
A1 A2 A4 Bi B2 B4 C1 C2 C4.
This allowed my partner and myself to remove the
encoder and altimiter, using a hand pump calibrate the
encoder on the dining room table instead of in the
cold.
Here is a 100 ft Gray code table if anyone is
interested http://www.airsport-corp.com/modecascii.txt
I want to use a Basic Stamp II (I have a few) to read
the lines and display them on a serial LCD. The
question is the interface.
When a line has a zero value it is at 12 volts, when a
line has a one value it goes to ground. Could I just
put diodes on the lines and check each pin for when it
goes to ground? The Stamp is a TTL device. Do I need a
seperate chip to detect the voltage that can handle up
to 12 volts?
The goal is to give human readable altitudes on an lcd
display while in flight and providing mode C to the
transponder.
-Rich
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craig(at)craigandjean.com
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| Posted: Mon Jan 09, 2006 8:58 am Post subject: Blind encoder Display |
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My transponder will do this (Garmin GTX 327). Is there any display on yours?
Also some encoders also spit out RS232. That might be easier to connect to
the PIC.
-- Craig
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hdwysong(at)gmail.com
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| Posted: Mon Jan 09, 2006 9:51 am Post subject: Blind encoder Display |
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Rich -
Here's an RS-232 receiver (level shifter) that'll do what you're looking
for:
http://www.futurlec.com/Linear/75189.shtml
However, with a Google or two I bet you'll uncover a few robotics folks
that have already generated a plug-n-play solution for BS2 serial comm.
D
-----------------------
Richard Hughes wrote:
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craig(at)craigandjean.com
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| Posted: Mon Jan 09, 2006 10:24 am Post subject: Blind encoder Display |
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I think he is asking about the grey coded parallel interface with a 12 volt
swing.
-- Craig
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richardhughes260(at)yahoo
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skywagon(at)charter.net
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| Posted: Mon Jan 09, 2006 11:38 am Post subject: Blind encoder Display |
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Rich,
I am not familiar with the ACK unit.
Is it adjustable, and is the adjustment linear over the total altitude range
once you have made the new calibration?
David
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Mon Jan 09, 2006 5:40 pm Post subject: Blind encoder Display |
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Richard Hughes wrote:
| Quote: | When a line has a zero value it is at 12 volts, when a
line has a one value it goes to ground. Could I just
put diodes on the lines and check each pin for when it
goes to ground? The Stamp is a TTL device. Do I need a
seperate chip to detect the voltage that can handle up
to 12 volts?
|
There are a couple of ways to approach this. Perhaps the simplest is to
clamp the inputs to ground and +5 using diodes and provide a
current-limiting resistor like this:
+5
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---
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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