编程用的七段LED驱动码查询
上传时间： 2013-11-11
上传用户：苏苏苏苏
OCMJ4X8B液晶驱动程序
上传时间： 2014-12-26
上传用户：zengduo
8X8点阵原理及驱动
上传时间： 2013-11-14
上传用户：zhf01y
直流电机与步进电机的驱动芯片介绍
上传时间： 2014-12-26
上传用户：jrsoft
msp430驱动dht11温湿度传感器程序，包括时序的讲解
上传时间： 2013-11-02
上传用户：sssnaxie
电机驱动L298N带光耦，自己收藏的资料。对刚学习步进电机控制的友友很有帮助。
上传时间： 2013-11-06
上传用户：wangzhen1990
10个经典电路图
标签： 经典电路
上传时间： 2013-10-21
上传用户：manlian
51单片机应用开发大全所含100个范例代码及电路图
上传时间： 2013-10-27
上传用户：英雄
现有基于MAX7219芯片的数码管驱动电路只适用于小尺寸LED，为扩展其使用范围，在介绍动态显示芯片MAX7219功能的基础上，提出了一个基于该芯片的8位高亮度8英寸数码管驱动电路。电路保留了MAX7219芯片的功能强大、编程简单等优点，通过74LS273锁存器和ULN2803达林顿驱动器，实现了对任意大尺寸数码管提供较高电压和电流驱动的静态显示，并亮度可调。 Abstract: The existing display-driving circuit based on MAX7219 was only applicable to small-size LED. To expand its use, based on the function introduction of dynamic display chip MAX7219, a display-driving circuit for high-brightness 8-bit LED with the size of 8-inch was proposed. The advantages of MAX7219 were retained, such as powerful function and simple programming. Static display with adjustable brightness for large-size LED with higher voltage and current was achieved with the help of 74LS273 and ULN2803.
上传时间： 2013-10-23
上传用户：31633073
设计了一种基于PIC16C71单片机的数字水温配制阀。该配制阀采用NTC热敏电阻作温度传感器，与固定电阻组成简单分压电路作为水温测量电路，利用PIC16C71单片机内置的8位A/D转换器把热敏电阻上的模拟电压转换为数字量，PIC16C71单片机控制直流电机驱动混水阀调节冷热水的混合比例实现水温调节。给出了控制电路图，对水温测量电路的参数选择和测温精度作了详细讨论。实验和分析表明，选用阻值较大的NTC热敏电阻和分压电阻可较好地解决热敏电阻因功耗较大造成的热击穿问题。 Abstract: A digital valve for controlling water temperature based on PIC16C71 was presented in this paper.A bleeder circuit which consisted of a NTC thermistor as temperature sensor and a fixed resistance was designed as water temperature measuring circuit.The analog voltage on the thermistor was converted into digital signal by a 8-bit A/D converter embedded in PIC16C71. Based on the digital signal， the MCU PIC16C71 drived the valve by a DC motor to adjust the water temperature through adjusting the proportion of hot water and cold water.The circuit diagram of controller was given，the principle，the component parameters and the accuracy of measuring temperatures were also dissertated in detail. It was found by experiment and analysis that thermal breakdown of thermistor caused by high power could be solved by selecting thermistor and fixed resistance with high impedance value.
上传时间： 2013-11-08
上传用户：Yue Zhong
