摘要
系统通过和铜板阻值同量级的精准阻性原件康铜丝与铜板四角连接在电路中产生所需小电压信号,利用低成本高精度仪表放大器件AD620进行微小信号放大,用8位A/D转换器件PCF8591对放大后的电压信号作A/D采集,并发送给主控芯片STC89C52单片机进行处理,驱动低功耗LCD12864显示出表笔所在的位置坐标,设计实现了手写绘图板电路。
System through precise resistance with copper resistance level original constantan wire and copper connection to produce the required little voltage signal in the circuit, takes advantage of low cost and high precision instrument amplifier AD620 device for small signal amplifier, Using 8-bit A/D conversion device PCF8591 to enlarge the voltage signal after A/D acquisition, And sends to main control chip STC89C52 single-chip computer for processing, to drive the low-power LCD12864 show pens and location coordinates, implements the handwritten drawing board circuit.
出处
《电子测试》
2014年第4期54-55,共2页
Electronic Test
基金
郑州市重点实验室光电信息技术及应用项目
编号:114PYFZ505
河南省教育厅重点项目"低成本大功率LED驱动电源设计"
编号:13A480778
