Keyboard and display circuit and calendar clock and storage circuit
The keyboard and display circuit are as shown in the following figure, which consists of two parts: keyboard circuit and liquid crystal display circuit. The liquid crystal display circuit adopts ZJM12864BSBD, which is a low-power dot-matrix LCD with a display format of 128 dots (columns) × 64 dots (rows). It has multi-function instructions and is easy to connect with MPU. The keyboard circuit adopts a separate button, and there are 7 buttons, which are measurement, mmHg/kPa conversion, memory, setting, up, down, and delete. It is possible to set the calendar clock, set alarm parameters, and access and delete blood pressure measurement values. The LCD can display systolic pressure, diastolic pressure, current time and calendar; in the query state, it can realize the date, time and measurement value of blood pressure measurement in the past, and can realize the graphical display of historical data through software programming (such as drawing blood pressure fluctuations). Curve), convenient and intuitive.
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The calendar clock and storage circuit are shown in the figure below, consisting of EEPROM24C256 and calendar clock chip PCF8563. The 24C256 is a low voltage, serial interface with a 256K memory for storing measured blood pressure values. The PCF8563 is an industrial grade I2C bus with a very low power consumption multifunction clock/calendar chip from PHILIPS. It is used to provide the time and date when blood pressure is measured for later use. It is convenient for users to have a clear memory of their blood pressure for a period of time. Practicality, overcoming the shortcomings of some electronic sphygmomanometers.
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