Naza2HoTT is a standalone Arduino based Application that acts as a HoTTv4 capable device to transmit Naza Gps and Compass information
parts List
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Arduino Pro Mini 328 - 5V/16MHz or what comparable.
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Voltage divider for input on the receiver HoTT 1.8 kohm and 3.3 kohm resistor.
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Power cable for HoTT input on the receiver
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Adapters for GPS Naza tap There is a finished (almost) costs are looking for a professional for "Flytrex Phantom Cable" approx € 9
circuit diagram
Forum entry on fpv-community http://fpv-community.de/showthread.php?47104-Naza2HoTT-Telemetrie-Adapter
It is Based on:
NAZADECODER from http://www.rcgroups.com/forums/showthread.php?t=1995704
and
DIY-HOTT-GPS https://code.google.com/p/diy-hott-gps/
and
John_lenfr http://johnlenfr.1s.fr/index.php?option=com_content&view=category&layout=blog&id=59&Itemid=110