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  • Author Author: phoenixcomm
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NeXGen: Hacking a ID-453/ARN-30 Course Indicator

phoenixcomm

imageThe ID-453/ARN-30 is a Vietnam-era CDI. The connector on the rear is an ARC 19 pin. Well, here I'm going to do this from memory as this indicator has been already been taken apart. So let's begin.

Analysis: As you can see there are 2 pointers (Vertical and Horizontal pointers) and 2 flags (Vertical and Horizontal pointers) as well as the FROM-TO motor and a resolver, but let's just talk about the first five. They really are the same, just D’Arsonval Meter Movements, and they can be driven by the Arduino PCM output.

image

image
Device Name Mnemonic Power Ground

Vertical Pointer

      Positive Going:

      Negative Going:

PCM_VP

 

A

B

 

B

A

Horizontal Pointer

      Positive Going:

      Negative Going:

PCM_HP

 

C

D

 

D

C
Vertical Pointer Flag PCM_VPF E F
Horizontal Pointer Flag PCM_HPF G H

To-From Meter

    TO

    FROM

 PCM_TFM

 

I

J

 

J

I
Resolver:
    Rotor Coil
    Stator Coils

RSLVR

RSLVR_R

RSLVR_Sin
RSLVR_Cos

neutral

 

O, P

N

L

K
image image

While most Arduinos, such as the Uno, Duemilanove, and the Leonardo only have only 6 PCM ports, the Mega2560 has 16 PCM output ports.

The  OBS pointer or the Omnibearing selector controls the selected bearing. This is shown by a small pointer and a small dot for the reciprocal bearing. This pointer is commonly referred to as the BUG A Resolver, Clifton Precision Type PS-17-E-1 is used to Read the Bearing' which are Sine and Cosine of the angle of the bearing.  The Resolver's COS and SIN are connected together at S1 and S2 (K), which becomes neutral, while S3 (N) and S4 (L) are outputs, SIN, and COS respectively.

In the picture below, you will see four black wire-wound resistors These are most likely shunts for the meters Just ignore them and test pinouts Here I used a DVM Amprobe  30XR-A30XR-A on the 2k ohm setting and the meters moved So I changed the setting to the and I could deflect the meter full scale and change the flags as well.image

The only other thing that I have to do now is to take care of the From-To Motor. This is the same as the other two flags but it is bi-directional, so it will require two (2) outputs as well.


~~ Cris image

Keep tuned in, More to Come!

 

Back to the Main Index
image

 

NOTES, FIXES, and TYPOS

  1. 07Oct16  Changed all variable names with '-' in them to '_' ....Blond Moment. LOL image
  2. 18Oct16  Changed the format of the table in Red.  (trying to fix the pdf downloader)
  3. 30Aug18 Changed some of the page formattings, to get rid of very small lines.
My Pin Outs:
ARC
12139
Connector		 Mnemonic RS232
Connector		 Mega Pin
A PCM_VP_pos 1 6
B PCM_VP_neg 14 7
C

PCM_HP_pos

 2 8
D PCM_HP_neg 15 9
E PCM_VPF_pos 3 10
F PCM_VPF_neg 16 neutral
G PCM_HPF_pos 4 12
H PCM_HPF_neg 17 neutral
I

PCM_TFM_pos

 5 13
J PCM_TFM_neg 18 14
K RSLV_neut 21 neutral
L RSLV_Sin 7
N RSLV_Cos 9
O RSLV_R_400Hz_1 12
P RSLV_R_400Hz_2 25
M, Q, R, S NO CONNECTION

 

 

Header file: D-453_ARN-30.hHeader 2

/* MEGA PINS */
  const int Serial_Rx = 0;
  const int Serial_Tx = 1;

// Vertical Pointer & Flag
  const int PWM_VP_pos  = 6;
  const int PWM_VP_neg  = 7;
  const int PWM_VPF_pos = 10;
// Horizontal Pointer & Flag
  const int PWM_HP_pos  = 8;
  const int PWM_HP_neg  = 9;
  const int PWM_HPF_pos = 12;
// From-To Meter
  const int PWM_TFM_pos = 13;
  const int PWM_TFM_neg = 14;
Part of my main file: D-453_ARN-30.c or pde
#include D-453_ARN.h
void setup() {
  pinMode( PWM_VP_pos,  OUTPUT ); // for change in direction change polarity
  pinMode( PWM_VP_neg,  OUTPUT ); // for change in direction change polarity
  pinMode( PWM_VPF_pos, OUTPUT );
  pinMode( PWM_HP_pos,  OUTPUT ); // for change in direction change polarity
  pinMode( PWM_HP_neg,  OUTPUT ); // for change in direction change polarity
  pinMode( PWM_VHF_pos, OUTPUT );
  pinMode( PWM_TFM_pos, OUTPUT ); // for change in direction change polarity
  pinMode( PWM_TFM_neg, OUTPUT ); } // for change in direction change polarity
//      OUTPUT +/- SCALING