RC Receivers Hacked

This article show you how to hack different RC receiver models to get the PPM signal...

CIMG7029_1

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RC PPM signal

RC Receiver Overview

A standard RC receiver is made of four main blocks :

  • Radio-frequency block (FM receiver + antenna) which converts through demodulation the signal into a form usable for the other blocks. This particular signal is a PPM (Pulse Position Modulation) coded signal.
  • PPM signal decoder which converts the pulse positions into PWM (Pulse Width Modulation) servo signals
  • Synchro blank detector block which detects PPM frames separation in order to re-initialize the PPM decoder.
  • Power supply block which supplies all blocks from external receiver supply (on one of the servo header)

standard_rc_receiver_block_diagram

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RC Receiver Hacking Tutorial

In some RC homemade applications based on microcontrollers, the receiver must be slightly modified in order to get a PPM signal.

CIMG6377

Let's see how to patch a Castle Creations Berg 4L RC receiver...

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