1.2GHz FPV Receiver customized control

In a previous post I described how to control the internal tuner module of a common 1.2GHz FPV receiver by a PC.

Since this setup was only for general tests I put some more efforts and put an AVR tiny44 in control.

On a 4 channel receiver I removed the original micro-controller and replace it by a AVR tiny44, running on internal 8MHz oscillator.
The tiny44 takes inputs from the 4 DIP switches and controls the tuner by I2C and the LED.

Attached to this post is the source code for the tiny44, written for WinAVR compiler.

With this code you have the following functionality:

DIP1 DIP2 DIP3 DIP4 Function
ON OFF OFF OFF Favorite frequency 1, default 1240MHz
OFF ON OFF OFF Favorite frequency 2, default 1280MHz
ON ON OFF OFF Favorite frequency 3, default 1276MHz
OFF OFF ON short OFF Manual tune, 1MHz up
OFF OFF OFF ON short Manual tune, 1MHz down
OFF OFF ON long OFF Auto tune, 1MHz up every 100ms
OFF OFF OFF ON long Auto tune, 1MHz down every 100ms

For DIP3 and DIP4 a long press will be >1 second.

The frequency set using DIP3 and DIP4 will be stored in EEPROM 5 seconds after last tuning action (DIP switch used).
After power cycle this frequency will be the start for new tuning.

Frequency range for manual/auto tuning is 850MHz to 2200MHz in 1MHz steps.

Wiring is given in the source code, header of main.c.

FPV Receiver Control
FPV Receiver Control
FPV_Receiver_Control.zip
Version: 1.0
13.8 KB
682 Downloads
Details
FPV Receiver Control
FPV Receiver Control
FPV_Receiver_Control.zip
Version: 1.0
13.8 KB
682 Downloads
Details

3 thoughts on “1.2GHz FPV Receiver customized control

  1. Hello Michael, congratulations on your excellent work, I bought a 4-channel 1,2GHz wireless A/V kit Tx/Rx and I’ve been modifying the receiver,I have done a similar project and want to share with you and all who wish to experience in this field,please visit mi blog: http://esquinaelectronica.blogspot.com/2011/07/control-de-un-receptor-av-en-12ghz.html
    I am working on customization of the frequencies of the transmitter with a PIC 12F629 and I hope to finish soon
    Best Regards

    • Receiver looks similar to those I’m using, only that mine are 1.3GHz. Tuning shouldn’t be a problem.
      Extending wiring shouldn’t be a problem either. Just use a shielded cable for the video signal.

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