Design of Transfusion Speed Monitor Based on MCU and Photoelectric Switch

The manual operation mode of measuring transfusion speed in medicine is inconvenient and inaccurate, and is likely to cause dispute. A supervisory computer was designed to monitor transfusion speed. It mainly consisted of MCU C8051F930 as the control core, a photoelectric switch as liquid drop sensor, a threedigit seven-segment LCD, four keys, four LEDs and acousto-optic alarm circuits. The supply voltage for C8051F930 is 0.9 to 3.6 V, so the monitor can work in one-cell mode (supports 0.9 to 1.8 V operation) or two-cell mode (supports 1.8 to 3.6 V operation). The operating range of one cell is extended and the service life of cells in two-cell mode will be increased. The monitor has the merits of low cost, simple structure, convenient operation, accurate counting, quick respond, reliable functions, small volume, light weight, ultra-low power, low drive voltage, etc.