Agrar-Modellbau im Maßstab 1:32

Adaptation to SIKU Control – Prototype

Adaptation to SIKU Control – Prototype

Taja-electronic’s add-on decoder for SIKU Control tractors can also be used externally. In the following article we explain how a trailer (SIKU farmer series) is upgraded with dumping feature, extra blinkers and lighting. All above features can be navigated by SIKU radio control.

The modified trailer is a prototype which was produced while developing the decoder. This means that the focus is not on the design but on functionality. This modification-project is well suitable for beginners as all steps are easy to understand, works are completed externally and no manipulation of the tractor engine is necessary.

Electric power supply – preliminary considerations

The trailer will get its own power supply unit for LEDs and servomotor. The decoder is powered by the tractor. My first idea was to let the tractor be the only power unit supplying all other parameters. However the Servo did interfere that much that the decoder crashed and re-started again and again. It shall be possible to stop interferences effectively by using suitable resistor-capacitor (RC-) units. Yet I decided to separate the electric systems. This way the tractor-accumulator does not need to additionally power the Servo of the trailer. Which means that it will therefore discharge not so very fast. The extra power consumption of the decoder module can be neglected.

Assembly and Setting up

The bore-holes for mounting the screws of the Servo are sawed outwards. Now the motor can be inserted directly into the framework of the trailer and fixed by two-component adhesive. A thin metal sheet is placed inside of the front space of the framework and fixed as well. At this position the accumulator can be placed from below by using a Velcro® tape. As the data cable coming from the tractor is quite short the connector for the data link to the tractor is placed within the front area as well. To realize this I have rasped the framework at this point and affixed the connector by using superglue. The decoder is placed behind the rear-wheel.

Replacing the imitation of the back carrier a printed circuit board is used to carry the lights. All blinkers and the light as well as the series resistors for the LEDs are soldered on top.

All parts need to be connected first. As several thin cables need to be soldered it is good if the decoder is easily accessible. After the functional test was successful the decoder can be affixed. I have used hot-melt adhesive so, if this should become necessary, the decoder can be removed again without partial damages.

Bill of materials


  • Servo e.g. Y-3009 (Length x Width x Depth) 23 x 12 x 27 mm, 18 Ncm at 4,8V
  • Accumulator Novacell LiPo 180 mAH
  • Connector for the data cable
  • Thin metal sheet and Velcro® tape for the accumulator holder
  • Connector for the accumulator
  • Sliding switch
  • Decoder printing circuit board
  • 2 LEDs red for the light
  • 2 LEDs orange for the blinkers
  • Several thin cables
  • 3 series resistors for the LEDs
  • trailer



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