Open Source Antenna Tracker, here! - Page 30 - RC Groups
Thread Tools
Dec 28, 2012, 03:57 PM
Registered User
jalves's Avatar

Time to investigate the culprit the tracker work very well in my home, but not in the field...

I have here 5 lm1881 chips, two of them (1st batch) work very well, the other 3 also work well together, but they don't mix well. I have to teak the code to work well with mixed batches of chips.

Tomorrow will take the pc with me to the field to try to understand what's going on there that prevents the tracker from working well.

In regard of the video telemetry for the openMAXosd the "module" is working well in the bench (wired and wireless), now it's time to integrate it in the openMAxosd code.
Sign up now
to remove ads between posts
Dec 28, 2012, 04:13 PM
Registered User
Grzechu's Avatar
Ok guys, here is schematic for 5.8GHz AV from Hobbyking (Boscam) - inverting amplifier

And some pics

Now I'm going to connect servos. I hope that it will works
Last edited by Grzechu; Dec 28, 2012 at 04:21 PM.
Dec 28, 2012, 04:29 PM
Registered User
jalves's Avatar
keep the fingers crossed
Dec 28, 2012, 04:48 PM
Registered User
Is it possible to use the ardupilot as the autopilot + upload the code from the openat and use is as antenna tracker TX as well ?
Dec 28, 2012, 05:49 PM
Registered User
jalves's Avatar
I think it could be possible, you just have to program two new PWM outputs (two new for the AT or two new for the AP) because I use two them of the original code for PAN and TILT.

If you manage to advance, please share the code here.
Dec 28, 2012, 10:16 PM
Registered User
aquintero's Avatar
hi Jalves,
Would you please give a quick look to my material list? I have to make international order and it will take some time. I am working in CAD standard design for mechanical so you can make this proyect standard and share in ur wiki if you like, later I can improve the electronic diagrams.

main elements:
  • 2 x Servos (Hitec HS-645MG)
  • 2 x Arduino Pro Mini 328 - 5V/16MHz
  • bateries, bec
  • resistors and other minor elements

1. Do I need arduino Demilanove as RX side or is ok with arduino pro mini as the link below?

2. What about LCD, do we need it? I found one below.

thanks for your comments sorry for silly questions (but I hurry to order).
Andres Q.
Dec 29, 2012, 05:16 AM
Registered User
jalves's Avatar
The servos are good ones, but a little to much in strength (to much torque for our usual antennas, what antenna you pretend to use?), but for PAN you only get about 120~180 degrees with these servos.

No need to change anything in the code but bear in mind the 180š PAN.

You can use any arduino board with the atmega328 , I prefer the duemilenouve/uno for the ground station, but use a mini pro in the model plane.

You can use a lcd, but the tight timings don't recommend its use.

Check the good working of the tracker before adding the lcd to the tracker.
Dec 29, 2012, 01:16 PM
Registered User
aquintero's Avatar
thanks a lot, itīs clear now.
Dec 29, 2012, 02:17 PM
Registered User
ntgr's Avatar
I wonder how easy is to replace the pan servo with a stepper motor?
Dec 29, 2012, 03:28 PM
Registered User
aquintero's Avatar
Originally Posted by typicalaimster
I follow the Wiki when I assembled mine.

I went with a Arduino Nano instead of a Mini... I'll probably scale mine back to two Nano's vs a Mini and a Uno.

1 - Arduino Board
1 - 1.8k Resistor
1 - 8.2k Resistor
1 - GPS

1 - Arduino Board
2 - 100k Resistors
1 - LED
1 - Resistor to match your LED (470 ohm on the schematic)
1 - Push Button
1 - 0.1uF Ceramic Capacitor
1 - 360 degree servo
1 - Servo

For the 360 degree servo I hacked the servo and removed the internal potentiometer and gear stop. I added a external 5k ohm potentiometer.

Hope that helps!
Hi, can I use Futaba S3305 for PAN? unfortunately i dont have to many options i found that one in similar proyect and towerhobbies store. Thanks for your recommendation.

Operating Voltage: 4.8-6.0 Volts
Operating Speed (4.8V): 0.25sec/60 degrees at no load
Operating Speed (6.0V): 0.20sec/60 degrees at no load
Stall Torque (4.8V): 99 oz/in. (
Stall Torque (6.0V): 124 oz/in. (
Operating Angle: 45 Deg. one side pulse traveling 400usec
360 Modifiable: Yes
Direction: Counter Clockwise/Pulse Traveling 1520-1900usec
Potentiometer Drive: Indirect Drive

Thanks for your comments.
Dec 29, 2012, 04:26 PM
Registered User
jalves's Avatar

One little question to you all:

Who from you, that are reading this question, has this Antenna tracking device mounted, in working order and use it in the RC field with regularity?

I would like to hear cases of success (or the lack of it...)

Dec 29, 2012, 05:07 PM
pisagor's Avatar

here is my arduino's i will start next week
Last edited by pisagor; Dec 29, 2012 at 06:44 PM.
Dec 30, 2012, 05:01 PM
Registered User
Grzechu's Avatar
Jalves, what sould I change in TX if I want to use pin 11 instead of pin 10? I burnt it

I changed
" pinMode(11,OUTPUT);"

But it doesn't work
Dec 30, 2012, 05:06 PM
Just another user
Dennis Frie's Avatar
Originally Posted by Grzechu
Jalves, what sould I change in TX if I want to use pin 11 instead of pin 10? I burnt it

I changed
" pinMode(11,OUTPUT);"

But it doesn't work
It's not "just a pin"
Pin 10 is the MOSI-pin if I remember correctly. It have a 8-bit buffer to send out chars, and can be used at a high speed (8MHz).

If you have really fried pin 10, I would suggest to buy a new Atmega328P. If it's an Arduino with the Atmega328P in socket, you can get them quite cheap with bootloader.
Last edited by Dennis Frie; Dec 30, 2012 at 05:21 PM.
Dec 30, 2012, 05:20 PM
Registered User
Grzechu's Avatar
Hm, I don't say precisly. I can't solder into pin 10, now it is pure laminate. I know that I can solder it into atmega or ftdi but I don't have good soldering.

Eh, again costs This will be my third Arduino nano ^^

So, it can be only pin 10?

I found:

SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.
Last edited by Grzechu; Dec 30, 2012 at 05:25 PM.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Help! LRS/UHF/XPS for Aurora 9, and 1.3ghz Antenna Tracker. Eagleeyes or Skylark? daign FPV Talk 2 May 17, 2012 04:36 PM
Sold 360 Servo for (Antenna Tracker or PAN).....NEW crd FPV Equipment (FS/W) 1 Apr 15, 2012 06:39 PM
Sold RVGS Antenna Tracker scrape FPV Equipment (FS/W) 0 Apr 01, 2012 12:18 AM
Sold Antenna Pan/Tilt for Antenna Tracker w/ MG Servos imagebuff FPV Equipment (FS/W) 1 Mar 20, 2012 03:26 AM
Sold Servo City Heavy Duty Pan / Tilt for antenna tracker w EZ Antenna Tracker thefokker FPV Equipment (FS/W) 4 Sep 08, 2011 08:53 AM