FtControlSetReceiver Class Reference

Receiver interface for the fischertechnik IR control set. More...

#include <FtControlSetReceiver.h>

Detailed Description

Receiver interface for the fischertechnik IR control set.

An mbed port of the code found on this ft community WIKI page The ft IR remote control uses some kind of RC-MM Protocol . When any of the controls is applied the remote control sends updates at a rate of at 1/120ms or 1/90ms depending on the senders frequency setting. Each message delivers the complete remote control status encoded into 30 bits. The structure of the message can be seen in FtControlSetMessage.h. The protocol uses Pulse Distance Modulation (PDM) with two bits (di-bit) per pulse, hence four different distances. A transmission consists of 16 pulses (15 distances) for a total of 30 bits.

I assume that the ft control set works fine with standard 38kHz IR detectors. I have used a CHQ0038 from a broken DVD Player. It can be onnected directly to the mebed: GND, VCC->3.3V and the signal line to any of the numbered mbed gpios.

The PDM timing of the ft IR control set isn't that exact. Thus receive errors occur quite frequently. I am observing an error rate somewhere between 3% and 5%. This driver "ignores" up to 3 consecutive receive errors, i.e. it just indicates an error but still provides the last correctly received message, before it resets the message to zero after the fourth error.

Some fluorescent energy saving lamp might disturb the transmision quite heavily.

Definition at line 31 of file FtControlSetReceiver.h.

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