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LED bar graph display pressure gauge circuit with integrated

2016-12-17 22:38  
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LED bar graph display pressure gauge circuit with integrated Silicon pressure sensor MPX5100A
Its measuring range is 0~100kPa, resolution is 10kPa. +12V power can get +5V stabilized voltage output after passing three-side integrated voltage regulator 78L05, the maximum output current is up to 100mA, and it provides power for MPX5100 and LM3914. MPX5100's output voltage connects to UIN side of the LM3914. After the UREF+ end and RHI-side are connected in a short circuit, then UREF-end connects RP2, RP2 is full scale adjustment potentiometer. RP1 is zero scale adjustment potentiometer, when measured pressure is zero, adjusting RP1 can make all LEDs be hidden.