Wearable smart devices should not only satisfy the wearer in function as much as possible, but also make the wearer feel uncomfortable. Especially for smart diapers and infant underwear, because they are in direct contact with sensitive parts, special attention should be paid to the design of comfort. Secondly, because intelligent devices need to collect and analyze data, data processing and result display also need to be considered.
In the display design of the detection device, a 0.64 inch display screen is applied instead of the traditional LCD screen. Because the equipment needs to work for a long time, low power consumption has become a basic requirement. The traditional LCD screen needs the backlight module as the light source, which not only has high power consumption, but also has large volume, so it is not suitable for some portable devices. OLED screens use organic light-emitting semiconductors to illuminate each pixel. In contrast, for LCD, OLED will be relatively simple in structure and composition and slightly cheaper in manufacturing cost. The power consumption of self illumination after power on can be half lower than that of LCD screen of the same size. Its luminous color will vary according to different materials. In order to control the design cost, only monochrome integration module is selected.
OLED module is selected with a resolution of 128 × 64, that is, 128 rows and 64 columns. This design adopts three wire SPI communication mode, and the screen is only used as a slave to receive the command of the host. The screen module is powered by 5V voltage. There are seven pins in total, that is, d0 pin is connected to the clock signal line of the microprocessor; D1 pin is connected to the MoSi pin of the microprocessor, and res is connected to the Po of the microprocessor 5 pin is used to reset the OLED screen, where the pin low level is effective, and DC and CS are respectively connected to the Po of the microprocessor 6.PO. 7 pin, corresponding to the data control pin in SPI communication and the slave selection signal line. The program lights up the pixels of the corresponding coordinates and mainly displays the detection results of glucose and uric acid on the screen.
Considering the application scenario of the system and the existence of mobile phones, the detection device does not involve too many human-computer interaction functions. The design includes power on key, reset key and menu key (up, down and OK), which are mainly used to select menu options or other extended functions of the screen interface. The reset key is connected to the rst pin of the microprocessor, and the menu function key is connected to the p2.1 ~ 4 pins of the microprocessor respectively, using the resistance pull-down mode of 1000 Ω.
In addition, since diapers need to be worn for a long time, electrochemical sensors may be affected by immobilized enzymes. Considering that the diaper is close to human skin and the temperature is about 37 ℃, it is conducive to enzyme reaction. People stay in bed for a long time in hospitals or nursing institutions, and the ambient temperature is relatively constant. Therefore, in the system design, 5V power supply voltage is adopted, which is controlled by P0.05 of microprocessor 0 pin controls and receives data.
The design of smart diapers and infant underwear will be different due to different functional modules, but the analysis of user data is an important basis for distinguishing from traditional products. Therefore, only when this technology is mature can function diffusion be possible.