FrSky DHT TTL modification

This time not so simple mod of FrSky DHT module inspired by awesome application for Android: FrSky Dashboard

Goal: make TTL level output from FrSky DHT module serial interface instead of standard RS232.
Why? To easily connect bluetooth module and microprocessor in r/c remote control.
I found similar mod here but it require cutting traces and adding new pins or cables to module. Because after mod old serial connector is useless I decided to not cut any traces and use old pins to send ttl signals.
In fact mod is simple but requires using of hot-air and very precise soldering.

Module with shrinkwrap removed:

FrSky DHT without shrinkwrap (top side)

FrSky DHT without shrinkwrap (top side)


FrSky DHT without shrinkwrap (bottom side)

FrSky DHT without shrinkwrap (bottom side)

For RS232 levels interface SL3232 is used, so I removed it (with hot-air):

FrSky DHT with SP3232 removed

FrSky DHT with SP3232 removed

Connecting pins 12 with 13 and 11 with 14:

FrSky DHT with bypass connections

FrSky DHT with bypass connections

Meaning of external pins remained unchanged, just standard is TTL now, no additional pins or cables outside. Just put new heat shinkwrap and that’s it:-)

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