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Antenna Controller Speed Mod Guide

This document describes a firmware update for the OE5JFL antenna controller that adds manual speed control for the azimuth and elevation motors. It implements variable pulse-width modulation control of the motors in manual mode using additional buttons and pull-up resistors on spare input/output pins of the microcontroller. Pushing the buttons reduces the pulse-width modulation in steps from 100% down to the minimum speed, then back to 100% again. It remembers the speed setting when switching between manual and auto modes. The firmware modification requires adding pull-up resistors to two microcontroller pins used for the new buttons.

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Виктор Сабов
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129 views2 pages

Antenna Controller Speed Mod Guide

This document describes a firmware update for the OE5JFL antenna controller that adds manual speed control for the azimuth and elevation motors. It implements variable pulse-width modulation control of the motors in manual mode using additional buttons and pull-up resistors on spare input/output pins of the microcontroller. Pushing the buttons reduces the pulse-width modulation in steps from 100% down to the minimum speed, then back to 100% again. It remembers the speed setting when switching between manual and auto modes. The firmware modification requires adding pull-up resistors to two microcontroller pins used for the new buttons.

Uploaded by

Виктор Сабов
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Eme_contr_jfl_v77.

hex
1) Introduction

As many of us are getting QRV on the higher bands it might be a great feature to have
manual speed control on both azimuth and elevation motors for alignment or testing your
antenna system.
Untill now the OE5JFL antenna controller only has soft start and soft stop when operating
In “AUTO” mode
The idea came to implement some variable speedcontrol on the manual antenna movement.

2) Implementation:

When using the OE5JFL antenna controller in its default hardware configuration, the PWM
signal controlling both AZ (JP6) and EL (JP7) H-bridges (L6203 IC1 & IC2 of the motor/encoder
interface board) is pulled to VCC by R15 & R16.
When used in “AUTO” mode PWM is applied for speed control.
When used in “MANUAL” the speed is always 100%
As the Atmel 89C51ED2 has some spare I/O pins left, the idea came to add 2 buttons and 2
pullup resistors in order to add PWM in “MANUAL” Mode

3) How does it work:


When you “power on” the controller, the speed or PWM for both motors is 100% in
“MANUAL” mode (as default)

Each time you push the AZ or EL speed button the PWM speed is reduced by 1 step.(Total 30
steps) After reaching minimum speed it jumps to 100% again.

It remembers its value if you swith to “AUTO” mode and back to “MANUAL”

If you “power on” the controller the PWM is reset to default 100%

4) Hardware modification:
The free pins which are used on the 89C51ED2 are:

P0.0 for azimuth pin 43

P0.1 for elevation pin 42

You MUST !!! pull-up these pins if you use this firmware version

73 de Walter ON4BCB
The pins are close to a 100n capacitor and the 20 pin flat cable connector.

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