After selecting the hardware for the SensorCam P4 last week, we found that the interface led out from the main board is located at the bottom right corner of the board. However, what we need to create is a plug-and-play structure. If it is directly plugged in at the original position, the sensor module will not be at the center of the screen, and the obtained data will also be inaccurate. Therefore, we decided to make an adapter board to arrange the pins at the center of the screen, so that more accurate data can be obtained. The schematic diagram is as follows:

Among them, U1 is a 40-pin header used to connect the interface led out from the main board. U2, U3, and U4 are pins led out in the middle of the screen, and a three-sided design is adopted to enhance the stability when the module is plugged in. U5 is the interface for the button, and U6 is the interface for the knob. Among them, pins 4, 5, and 32 will be used as module fixing pins, but they are not entirely fixed pins. The levels of these three pins are different for each module, so these three pins can be used to distinguish different modules. The main controller automatically identifies the module by reading the levels of these three pins, thereby displaying different UIs and data. Theoretically, SensorCam P4 can automatically identify up to 8 modules, but other pins can also be added for expansion. Below is the 3D model of the adapter board:

In addition to the adapter board, we have also made adapter boards for the ranging module and the thermal imaging module to adapt to the main adapter board, so as to achieve a foolproof direct plug design. Below are the schematic diagram and 3D diagram of the adapter board for the ranging module:

Among them, H5, H6, and H7 are ranging modules with an identification code of 000, and their pins are all fixed, so there is no need to worry about inserting the pins incorrectly. The adapter board of the thermal imaging module may be more complicated because it is a board-to-board connector, as shown in the figure below:

We have led out the necessary IIC interface and SPI interface for it. The other unused pins are temporarily led out and can be chosen not to be used. A filter capacitor has also been added to the power supply. Below is its 3D diagram:

H14, H15, and H16 are connected to VCC, GND, and GND respectively, so the coding of the thermal imaging module is 100. Later, we will model the overall shell based on the actual size of these adapter boards connected to the main board.