Hi, Yes, it is a project i had in mind several months ago. I always had the idea of the autotracking antenna to give full freedom to my fpv flights, but i didn't want to use the audio channel to send data and loose the engine's audio. Then i thought in the use of the hidden lines of the video commonly used to send teletext and closed caption in tv. My OSD, the DakarOSD sends the necessary information through these hidden lines of the video to a video decoder in my home station, Lince(Lynx), as soon as this information is checked and filtered, it is converted to the movement of a servo (360º or standard servo) that point the patch antenna to my plane. At this moment i'm using this system very successfully and now i can fly in any direction without the limitations of a fixed patch. The project like Wavess says is open and I can offer more technical details about it. Regards Cristóbal Fernández _______________ DakarOSD 2.0 Lince 1.0 Robin 1.0 Vienna 1.0

Hi Mosfet, Fantastic instruments. Are you using interrupts to control the servos in your circuit? Regards

Hi Thomas, i'm very agree with you, although the project is developed around the idea of a low cost system to return home, in the future i'll improve the system with a 5 Hz GPS module to faster updates in the servo arm and a push botton to archive the home point in the eeprom of the microcontroller to avoid loose this point if the microcontroller restarts in flight. Regards and Happy Christmas to all the forum from Spain. Cristobal Fernandez Fernandez www.alastur.com

This project is developed around the idea of using cheap and tiny servos of 5 grams or less like real flight on board instruments. In this case the instrument i've developed is a "Return Home" instrument, i think all the telemetry is important, but the orientation to return home is the most important. It works like a real NDB, you need align vertically the arrow(the arm of the servo) to go in the correct direction. It is a very simple circuit with few components , designed to everybody can build it. It uses a microcontroller 18f252-i/sp , a xtal to 10 Mhz and a pair of resistors and diodes, an em-411 gps and a tiny servo like the tower pro sg-50 or similar. The circuit is completely isolated of the transmitter, camera, mic and the rest of fpv components, you only need install it in the field of view of the camera like a real instrument and supply it with 5v. There are a lot of diferent variations of installing the servo , you can use only the servo arm like a simple arrow with a wire, etc... i can supply the .hex file to anybody interested in build this return home system This is a Robin's video: Regards Cristóbal Fernández Fernández www.alastur.com

Hi Terry, In essentials, the schematic is very similiar to Vienna 1.0 , the microcontroller, the r2r and the amplifier is the same, if you are really interested in building "Real Engine" , i'll provide you the schematic and the .hex file Regards

This is a dynamic video of Vienna 1.0. you can hear perfectly her voice instructions

This is a dynamic video of Vienna 1.0. you can hear perfectly her voice instructions

At this moment i haven't a dedicated web to the technical info for Diy builders, but if somebody is interested i'll explain all the building details of "Vienna 1.0" and of "Real Engine"

Yes , Mr.RC-Cam, no problem with the .hex file if somebody needs it. The opto1 only needs 8 ma from the signal pin, at this moment is working perfectly with a futaba pcm receiver but the opto also could be driven by a npn transistor like i think you are suggesting. this is a little video that explains how it works, sorry, is in spanish, but you can hear perfectly the Vienna's voice. Now i'm developing the messages in english too. Excuse me my poor english.

This is the nearly finished schematic.

Hi, Acetronics Yes, i was using this same takamisawa model but 5V. Finally i decided to use 2 optocouplers switched by two PIC pins. Thanks

Thank you Thomas, i want switch between an lm386 1w amplifier and the mic input at this moment i used a micro relay activated by one pin of a microcontroller pic 18f252. Do you know something of dil-8 or less pins? Thanks in advance

i want substitute a micro relay because i think it is making a lot of noise to the rf with its electromagnetic field. I was thinking in a pair o optocouplers or something like that. Could you help me with this question? , i need to switch between two different audio inputs to only one output. thanks in advance

Hi Terry, The sounds are stored in a mmc/sd card like .wav files , it has 56 files to compose all the numbers and the rest of the messages.

Why don’t use the audio to send audible telemetry? Vienna is the name of a project nearly finished that transforms all the telemetry in voice messages through the audio of our FPV transmitter, it switches between the engine sound of the microphone and voice messages with an auxiliary channel of the transmitter combined with a gear. It is like a co-pilot or an onboard computer saying to us the flight instrumentation All this tiny circuit is onboard the plane, you don’t need anything in the receiver neither FSK modems nor another special device, only the headphones of our goggles or a little amplifier and a speaker. All the voice messages are selected from the auxiliary channel that plays/stops the messages combined with a gear to select 4 messages: - The first message is the Altitude, the Ground speed and the Course of the plane. - The second it is like a road navigator and it says for example “turn right 140 degrees” and the distance to a waypoint. - In third if we loose the plane it says the latitude and the longitude of the plane to recover it. - The last message is automatic and it says “careful, loose of radio signal” as soon as is activated the Fail Safe. At this moment it has a GPS receiver connected to it, but in the future we could connect another devices. The essential of this device is transform the telemetry in voice messages to keep the screen clear to fly, in the future could be combined with an OSD and have audio messages and data on screen. If you need technical info or any suggestions then let me know in this thread. Excuse my poor English. _______________________________ CRISTOBAL FERNANDEZ FERNANDEZ NUEVO ALASTUR club member www.alastur.com Asturias (North of Spain)