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Dfidalgo:
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Edit: Important notice, please make sure that you can find a 5V source on your radio, this board does not have a voltage regulator for the arduino, so you can not power it direct from your TX battery.Well, my TX is a Graupner MC-19, I think that a LM7805 can solve the problem dont? Anyway, I do intent to use your tx uhf with a joystick that generates the ppm signal from another arduino (details here: http://www.ianjohnston.com/content/index.php?option=com_content&view=article&id=30:project-rc-ppm-trainer-port-joystick) I have done this on my homemade console that you can see here at work:
Homemade radio console for FPV - YouTubeThe joystick will be a old but cool "Top Gun" , and a pair of old T2m rudder pedals, all for FPV obviously.