Digital Thermometer Design

             After power-on, the OLED screen and clock chip are first initialized, and then enter a loop processing process. It includes first reading the date and time data of the clock chip, then displaying it on the OLED screen, and then reading the temperature 18B20 and displaying it on the digital tube. You can also wake up the smart housekeeper (voice module) and send instructions to check the current temperature and humidity. The next step is key scanning. If a key is detected to be pressed, different tasks will be processed according to different keys. Then select the hours, minutes and seconds of the OLED screen according to different modes. The remaining two buttons are responsible for adding and subtracting time adjustments. In addition, the temperature displays different LED light colors in different ranges, representing different comfort colors. I refer to the temperature color bar in the Deli thermometer and hygrometer. If the temperature is too high, it will show red, if it is slightly high, it will show yellow, if it is moderate, it will show green, and if it is too low, it will show blue.