16 channel decoder PCBs

16 Channel Multiswitch Decoder

This module is connected to the receiver like a servo and decodes the multiplexed signal encoded by the 16 channel multiswitch encoder. Loads like lamps, motors, LEDs, relais can be connected to the decoder module and thus switched on/off by the encoder's switches.

There are two versions of the decoder module:

  • basic version with a max. current of 200 mA for each channel
  • LED version with a max. current of 2 A for each channel and visual on/off LED indication

The microcontroller firmware is the same for both versions and provides these features:

  • 16 switch channels
  • a latch mode can be configured for each channel individually
  • blink/flash mode can be configured for each channel individually

There is also a firmware version compatible with the original Robbe encoder module (8084) and with the original Graupner encoder module (4108) available, if your transmitter is already equipped with these and if you want them to use further.

A PIC 16F883 microcontroller evaluates the receiver pulse length and sets the channel outputs accordingly. A red LED indicates error conditions. There are two configuration jumpers for the latch mode, the blink/flash mode and a learning mode for measuring the pulse lengths generated by the transmitter/encoder combination. For more details please refer to the manual.

The free version of the firmware (see download link above) has a built in waiting time, the red LED flashes for 30 secs when the module is switched on. After 30 secs there are no functional restrictions.

Basic Version

Two ULN2803A driver ICs are used and this version is ideal for connecting relais modules or switching loads with low power consumption like lamps or LEDs. An external power supply 6 V ... 24 V for the loads can be connected via a screw terminal, alternatively the loads can be supplied from the receiver battery.

LED Version

There is a LED display for indicating the switch state for each channel. Loads with a max. current of 2 A can be connected. Optionally, two different external power supplies (e.g. 6 V and 12 V) can be connected for driving loads with different voltages. Eight IRF 7103 double MOSFET transistors (SMD) are used for driving the loads.