How the Current Sensor 8×3A works
As soon as a vehicle draws current in any of the monitored sections, the corresponding signal output switches to ground (GND). The eight signal outputs correspond one to one to the eight track outputs and are connected to the inputs of an s88 or s88-N feedback module. Alternatively, you can evaluate the signal directly with LEDs, for example for red illumination in a track diagram control panel.
The current sensor needs only one input from the command station or booster and distributes the current across eight sections. All eight outputs are at the same potential: in the 2-rail system you always separate the same rail, in the 3-rail system the centre rail or both outer rails. You set the sensitivity for each output with a potentiometer. Thanks to spring terminals, the module is wired quickly and without soldering.
What else you need
- an s88-N Feedback Module, 8-way – it matches the Current Sensor 8×3A exactly with its eight inputs
- for individual sections or FREMO modules: the Current Sensor 1×3A
- current sensor and feedback module in one device: the s88-N Occupancy Detector, 16-way
Note: The current sensor only works on digitally operated layouts; analogue operation is not supported. The total current at the input must not exceed 3 A, and short-circuit detection must be active on the command station or booster.
Frequently asked questions
Do I need a separate feedback module as well?
If the signals are to reach your command station: yes, an s88 or s88-N feedback module with at least eight inputs. For a simple indication with LEDs in the control panel, you do not need a feedback module.
Can I read out the occupancy detection with an Arduino?
Yes. The signal outputs switch to GND. Connect the GND of the current sensor to the GND of the Arduino and the signal outputs to digital inputs with an internal pull-up resistor (INPUT_PULLUP). An occupied section is then read as LOW. Important: never connect the GND of the current sensor to the track.
Can I use several boosters?
All eight outputs are connected to one common input and therefore to one booster. For a second booster section, use another current sensor – or the s88-N Occupancy Detector, 16-way, whose two groups can be run from different boosters.
