Description: The design of this electronic valuation includes bridge strain circuit, preamplifier circuit, AD conversion circuit, microprocessor, alarm, keyboard and liquid crystal display. Bridge strain of the main electric circuit to complete pressure signal measured, the weight of the object into a voltage signal, obtain the initial signal, and then send the signals to the back of the preamplifier circuit, the amplifying circuit to enlarge the weak signal, increase the sensitivity of the measurement, and then through the AD7705 converts analog signals into digital signals, so that the next step with single chip microcomputer, put the converted digital signal transmitted to the microcontroller, through conversion processing by single-chip microcomputer, the resulting negative amount should be through the LCD display, keyboard input is the function of unit price of the item, the function of alarm is sounding when goods more than the weight of the range, said overweight. The maximum range of this electronic valuation is 60Kg, but more than this range electron will automatically call the police.
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