Smart car—track electromagnetic wire connection fixing plate

When laying the smart car track, the PCB of this project can be used to fix and connect the electromagnetic guide wires to achieve the relevant requirements mentioned in the competition rules.
 
The PCB of this project can select different functions by shorting the pads. As shown in the figure below, if pad 1 and pad 4 are short-circuited, the requirements of the competition rules can be achieved, that is, the signal from the XH2.54-2P connector is used without the headphone plug inserted, and the headphone plug is inserted. The signal from the headphone socket is used below; if pad 1 is connected to the exposed copper area above, the signal from the XH2.54-2P and the headphone socket is used at the same time. There is a space for a 1206 capacitor on the PCB, which is connected in parallel to both ends of the electromagnetic wire. The impedance can be adjusted as needed. Generally, there is no need to weld the capacitor.
 
The finished product is as shown below:
 
Installation started:
 
Installation completed:
 
Tips: The electromagnetic guide wire can be twisted into a twisted pair where the two wires are parallel to reduce interference caused by signal leakage.
 
Test:
when the headphone plug is not inserted, the electromagnetic wire signal comes from the XH2.54-2P connector;
when the headphone plug is inserted, the electromagnetic wire signal comes from the headphone socket.