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本文介绍一种家用电子手提秤,它具有称重精度高、简单实用、携带方便、成本低等特点,很适合家庭购物时使用。 该电子手提秤由称重传感器、放大电路、A/D转换和液晶显示电路四部分组成,电路如图1所示。图中E为9V叠层电池,R1～R4是称重传感器的4片电阻应变片,R5、R6与W1组成零件调整电路。当载荷为零时,调节W1使液晶显示屏显示零。A1、A2为双运放集成电路LM358中的两个单元电路。A1、A2组成了一个对称的同相放大器,A/D转换器采用7106双积分型A/D转换器。液晶显示屏采用31/2液晶显示片。根据手提秤的特点,传感器应该选用S型称重传感器,但是S型称重传感器成品的价格较高,为了降低成本,可用半成品CHBL3型双孔悬臂梁称重传感器进
This article describes a home electronic portable scales, it has a weighing accuracy, simple and practical, easy to carry, low cost, it is suitable for home use. The electronic portable scales by the load cell, amplifier, A / D conversion and liquid crystal display circuit composed of four parts, the circuit shown in Figure 1. E is 9V laminated battery in the picture, R1 to R4 are 4 resistance strain gauges of weighing sensor, R5, R6 and W1 make up the part and adjust the circuit. When the load is zero, adjust W1 so that the LCD shows zero. A1, A2 for the dual operational amplifier integrated circuit LM358 two unit circuits. A1, A2 form a symmetrical in-phase amplifier, A / D converter using 7106 dual integral A / D converter. LCD screen with 31/2 LCD film. According to the characteristics of portable scales, the sensor should be used S-type load cell, but S-type load cell products higher prices, in order to reduce costs, semi-finished products available CHBL3 double hole cantilever load cell