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 (bottom side)

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

FrSky DHT with SP3232 removed

Connecting pins 12 with 13 and 11 with 14:

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:-)