Domburg ASB Manuel utilisateur

Domburg Train Support

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DTS

Manual

DTS Manual:

Analogue Servo Control ASB

Version 2 - 2019

Manual ASB │ version 2 – 2019

Pagina: 2 van 11

Content

Introduction ......................................................................................................................................................... 3

How the ASB works ............................................................................................................................................. 4

The functionality of the ASB ............................................................................................................................ 4

Possibility’s to control the ASB ........................................................................................................................ 4

Mounting ............................................................................................................................................................. 5

Servo bracket ................................................................................................................................................... 5

Servo ................................................................................................................................................................ 5

Spring steel wire .............................................................................................................................................. 6

Aansluiten ............................................................................................................................................................ 7

Power ............................................................................................................................................................... 8

Servo’s .............................................................................................................................................................. 8

Rocker switches ............................................................................................................................................... 8

Relay ................................................................................................................................................................. 9

Configuring the controller ................................................................................................................................. 10

Resetting the ASB ........................................................................................................................................... 10

Fault status ..................................................................................................................................................... 11

FAQ .................................................................................................................................................................... 11

The heat sink of the print gets hot, is that a problem? ................................................................................. 11

When I switch on the power supply, the servos convulse ............................................................................ 11

Epilogue ............................................................................................................................................................. 11

Manual ASB │ version 2 – 2019

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Introduction

Thank you for purchasing the Analogue Servo Control ASB. This item has been specially developed for

users who would like to operate their switches and barriers beautifully and reliably by hand. A controller

that is unique in its kind and that offers an answer to a frequently asked lack. There are many users for

whom digital control is still a bridge too far, or who simply do not find digital control of accessories

interesting. This group of users controls their switches and scenery by hand with switches on a control

panel. A way that is well known to every model railroader. These users often use magnetic controls for

points, signals and barriers. A solution that has many disadvantages compared to servo control.

Servo control is not only cheaper to buy, but also many times more economical, reliable and beautiful

than the click-on magnets. However, you usually need a hardware for servo control with software to

operate the servos. Here are some solutions for this through a handful of small print providers. However,

these solutions lack the ability to switch a relay with a servo. These relays have two changeover contacts,

which makes it possible to polarize heart pieces and create feedback for the position of the change.

Until now this was only possible with an OC32 or self-build through Arduino. However, this is a great

solution for the advanced and experts among us. But for the normal model railroader there was no

solution yet, until now!!!

I wish you much ease of use with the ASB, if you have suggestions for improving the product or a critical

note. Let me know by sending an email to info@domburgtrainsupport.nl

Sincerely,

Martin Domburg

Manual ASB │ version 2 – 2019

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How the ASB works

The functionality of the ASB

The ASB works based on a PIC interface with a code with which it can function. For the PCB to work

properly, the power supply offered is reduced to 5VDC, which allows the PIC to operate the servos and

the relay.

Each servo is controlled via a switch. The most used is the rocker switch, but any switch that retains its

position is suitable for this. A link is made to the middle position of a servo in the internal code with a

relay. As soon as the servo has reached its middle position, it switches the relay on or off depending on

the position taken.

To determine the servo positions and speed, three push buttons are present namely: Plus, Enter and Min.

The internal code can be set with these three buttons.

As mentioned, the ASB can control two servos, but it does not do this simultaneously. If you control a

servo and immediately control the second, the print will first convert the first servo and then the second

servo. This is built into the code to prevent the interface from missing a command. This makes the servos

work more reliably.

Possibility’s to control the ASB

With the relay it is possible to perform several functions by means of two changeover contacts per relay.

Some of the most common:

 Point polarization of a switch

 LED status notification on a control panel

 Activation of an MP3 player (e.g. the AVT 100 series MP3 player)

 Switching of a signal position to the switch position

 Switching blocks to the switch position

This is a selection of the many options. If you have applied a new option, please let me know. I can collect

and process this in this manual.

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Mounting

The ASB has 4 mounting points. It is advisable to mount the printed circuit board at height due to the

heat development of the voltage regulator. Preferably with the components on top.

Mounting the ASB in upside down or sideways position is also possible if you consider the cooling of the

cooling element.

For the assembly you can use the printed circuit board assembly kit which

you can find in the webshop.

Servo bracket

The MDF Servo brackets consist of 3 separate parts. A base plate stands and partition.

You must glue the 3 parts together with preferably wood glue. Hobby glue and hot glue are also good.

Note the partition, it only fits well in one way. Then the sides are the same. You can use the bracket by

Mount the supplied sheet screws on your layout.

Servo

The servo has several arms. Choose the arm that you wish to use and mount it on the servo. Be sure to

use the small screw to secure the arm to the servo shaft.

You must now position the servo in the bracket in this way and screw it into the servo bracket with two

plate screws.

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Spring steel wire

The spring steel wire can be used to affect the transfer between the servo arm and the object to be

moved. You do this as directly as possible. Every kind of bending, Z-cut and V-cut are not necessary and

counteract the movements.

The most common way of mounting is right under the switch tongue, making the distance and movement

of the servo as short as possible. You can use the different holes in the arm to play with the stroke of the

servo. If the stroke is too short or too fast, you can prefer a hole closer to the axis. If you want a direct

movement, choose a hole as far as possible from the axis.

The distance from the arm to the servo is irrelevant, if you cover more than 5 cm perpendicular to the

arm and in line with the movement of the servo, it is advisable to use a tube to guide the spring steel.

Tip: use the cotton buds for this. That saves you a lot in your wallet.

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Aansluiten

Figure 1

V + Positive voltage between 7-35 VDC

GND Well-known minus, or the Ground

Servo 1 First servo connection

Servo 2 Connection second servo

S1 Rocker switch associated with servo 1

S2 Rocker switch associated with servo 2

Servo1 Contact 1 First changeover contact of relay 1 associated with servo 1

Servo1 Contact 2 First changeover contact of relay 1 associated with servo 1

Servo2 Contact 1 First changeover contact of relay 1 associated with servo 1

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Power

The supply voltage that must be offered on the ASB is a direct voltage of a minimum of 7 volts and a

maximum of 35 volts. A voltage between 12 and 15 volts is recommended. Offering an alternating

voltage is not allowed, if you do this can cause irreparable damage to the printed circuit board and its

components.

If you have an alternating voltage you can solve this by using a bridge rectifier circuit as shown below in

figure 2 by means of a few simple parts such as a bridge cell rectifier and an Elko capacitor.

source Wikipedia

Figure 2

On the two-pole terminal of the ASB you can offer the DC voltage as in figure 1. On the voltage regulator

side, you offer the positive voltage (V +) and on the other side the ground or better known as V- (GND).

If you have connected the polarity correctly, the green POWER LED lights up. If you connect the polarity

incorrectly, the ASB will not light a green power LED.

Servo’s

Connect the servos to the two three-pole headers with the text "servo 1" and "servo 2". It is important

that you connect the orange wire of the servo cable to the inside of the print. If you plug the plug in the

wrong way, the servo will show strange behaviour.

You can extend the servo cable if desired. You will find servo extension cables 30, 50 and 100 centimetres

long in the webshop.

Rocker switches

You offer the two rocker switches on the four-pole terminals next to the servo connection. The two left

terminals (S1) are a set and belong to servo 1. The two right terminals (S2) are the second set and belong

to servo 2.

The rocker switches each have 3 contacts, identical to those of the relay. You connect one terminal to the

middle leg of the rocker switch, the other terminal to either the left or the right leg of the rocker switch.

You repeat this with two wires for the second set of terminals.

Incidentally, it is not necessary to use a rocker switch. Any switch that switches between two contacts is

enough to operate the servo.

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Relay

Each servo has a relay that switches to the middle position of the servo. As shown in figure 1, each relay

has two changeover contacts. This means that every contact consists of a Common (COM), Normally

Closed (NC) and Normally Open (NO). We have indicated this more easily by a few letters per contact:

P: Common

A: Normally Closed

B: Normally Open

In principle you can forget the above again. You connect the supply wire of what you want to switch to

the P, then the contact switches this voltage to either A or B. This depends on the position of the relay.

If you want to polarize a switch:

1. Solder a wire to the point of the switch and connect it to terminal P (middle terminal of a contact)

2. Solder a wire to the rail, which is straight, it feeds the heart piece when bent. Connect this to

terminal B

3. Solder a wire to the rail, which is bent, this will feed the heart piece in the straight-through

position. Connect this to terminal A

4. Measure with the multimeter after switching the servo or the correct rail led to the heart piece

5. If this is not the case, exchange A and B

If you want to make a status message with an LED:

1. Connect the long leg of the LED (cathode) to the V + of the power supply.

2. Connect the short leg of the LED (Anode) to the A or B terminal of a contact. Depending on the

status message determined by the position of the servo.

3. Connect the GND of the power supply to terminal P.

Figure 3

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Configuring the controller

Each servo has its own characteristics due to its mechanical transmission from motor to gears. As a result,

the results of the servos cannot be programmed in advance. You determine the result per servo by

programming it in the ASB. This operation does not take much time but is very essential. On the printed

circuit board, you will see three push buttons with the text Plus, Min and Enter. You will need these keys

for programming.

There are 8 steps to go through of which 4 per servo:

Step 1: Left position servo 1

Step 2: Medium servo 1

Step 3: Right position servo 1

Step 4: speed servo 1

Step 5: Left position servo 2

Step 6: Medium servo 2

Step 7: Right position servo 2

Step 8: speed servo 2

To enter programming mode, you must keep the Enter key pressed for 3 seconds. After releasing the

button, the red PROGRAM LED lights up and you are directly in step 1. Go through steps 1 to 8.

You determine the result of the servo by using the PLUS and the MIN key.

When you have finished a step, press ENTER to go to the next step. You will then see the red LED go out

temporarily.

After step 8, both servos go into the middle position and the ASB is ready for use. If desired, you can

repeat the steps, the fact is that the order is fixed. You can also walk through the steps without making a

change. The ASB then remembers the position that the servo is currently in.

Resetting the ASB

It is possible that the programming did not go well, or you are not satisfied with the settings and want to

perform them again. You can of course go through the steps again. However, you can also reset the

entire ASB.

You can do this by keeping the PLUS and MIN button pressed simultaneously for 2 seconds in normal

operation. You hear the servos give a blow and the ASB is reset again.

This does not work in PROGRAM mode to protect your settings.

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