数码管显示—ADC0832电压表PROTUES仿真
上传时间: 2013-10-20
上传用户:zhang97080564
本文重点介绍A/D转换器的原理及其构成的单片机电压表工作原理
上传时间: 2013-10-16
上传用户:huanglang
简易电压表制作,可以精确测量0~5V的电压
上传时间: 2013-11-03
上传用户:786334970
1602液晶显示电压proteus仿真,基于adc0804多量程电压表
上传时间: 2014-01-12
上传用户:朗朗乾坤
采用AT可编程器件,用ADC0809采集电压信号。
上传时间: 2013-11-03
上传用户:sunchao524
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
针对目前普通日光灯因不能调节光强而造成的能源浪费问题,设计了一种基于单片机的新型节能日光灯系统,该系统主要分为3个部分,首先采集外界光强信息并将数据传至单片机;随后单片机根据输入量的不同调整输出的PWM波;最后日光灯控制电路通过PWM波的控制,调节日光灯两端的电压,控制日光灯输出的光强,使日光灯随外界光强的变化而自动调整照射光强。经过不同外界环境的实验调试,在满足使用者的用光要求的前提下,日光灯工作稳定,功率明显降低,适宜推广使用。
上传时间: 2013-10-29
上传用户:苍山观海
为了解决磁放大器性能测试过程中,需要对其供给不同数值恒定电流的问题,设计了一种基于DAC7512和单片机的数控恒流源系统。该系统采用AT89C51作为主控器件,将计算机发送的电流控制字命令转换为D/A转换器控制字,通过模拟SPI通信接口,写D/A控制字到DAC7512,从而控制其输出相应数字电压值,经差动缩放电路、电压/电路变换电路和功率驱动电路,最后输出恒定电流。实验结果表明,恒流源输出电流调节范围为-45~+45 mA、精度为±0.1 mA,分辨率达0.024 4 mA,具有应用灵活,外围电路简单,可靠性高的特点。该数控直流恒流源也可为相关产品的测试系统研发提供参考。 Abstract: In order to solve the need to supply different values constant current for the magnetic amplifier in testing process, numerical control constant current source system was designed based on DAC7512 chip and microcontroller technology. The system used the AT89C51 as the main chip, which can convert the current control word from computer into to D/A control words. And the system wrote D/A control word into the DAC7512 chip to control the output voltage value by the SPI communication interface, which can output corresponding constant current figures by scaling circuit, the V/I converter and power drive circuit. Experimental results show that the current source output current adjustment range is -45~+45mA, accuracy is ± 0.1mA, and resolution ratio is 0.024 4mA
上传时间: 2014-12-27
上传用户:invtnewer
摘要:设计的自动高压测试仪,以16位微处理机为核心,以IGBT为逆变器件,采用了智能输出调节技术,测试电压反应快、精度高、波形失真小。由于在电路和软件程序中设置保护功能,仪器运行可靠。自动高压测试仪功能完备、分析能力强、操作简便。关键词:微处理机;测试仪;高压;规则采样
上传时间: 2014-12-27
上传用户:qlpqlq
采用基于Cortex-M3核的微控制器STM32F103CBT6设计了脉冲变极性弧焊控制系统。该系统利用片内的高级定时器实现了快速脉冲切换,以及脉冲频率、起始时间、占空比的大范围调节;利用定时器间的协同工作,完成了光谱触发信号的精确延时。同时实现了运行过程中对系统电压的测量、监控、传输以及参数输入、显示、存储等功能,并简述了软件开发方法。
上传时间: 2013-10-20
上传用户:苍山观海