自动浇水控制系统设计与试验

以STC89C52单片机为核心设计的设施园艺自动浇水控制系统,由检测、控制和显示三部分组成。将传感器检测到的温湿度、光照等数据与设定条件进行数据比较,根据比较结果控制水泵开启或关闭,直到参数达到正常标准,由LCD1602显示系统运行状态相关数据。系统有定时和自动两种工作模式,可通过程序设定自动浇水条件,也可通过按键设定浇水时间、次数和时长。系统在proteus软件下进行了仿真,后经实物试验,性能稳定,具有一定应用价值。     

基于控制土壤湿度的智能花卉浇水系统设计

利用MSP430单片机的控制存储技术,设计出一种控制花卉土壤湿度并且显示记录湿度值的系统,解决了不能及时浇水以及缺乏浇水管理导致花卉生长不健康的问题。系统利用土壤湿度传感器进行实时检测花卉的土壤湿度,检测模式根据土壤湿度的不同值判断花卉是否需要浇水,通过恰当的浇水量使花卉生长在一个适宜的土壤湿度环境中。当主人外出时,自动模式能够模仿检测模式对花卉进行浇水,实现了自主学习的功能,达到了智能浇水的目的。     

基于AT89S52单片机的多功能音乐播放器

介绍一种多功能音乐播放器.它是以AT89S52单片机为核心,并辅有一些外围器件,采用汇编语言编写程序,实现多功能音乐播放.歌曲自动循环播放和使用琴键自编曲目功能.此外,彩灯显示歌曲节奏,按键跳转到喜爱曲目,液晶显示当前播英文曲目.并给出了系统软硬件设计.     

一种盆花自动浇水系统的设计

利用STC89C51单片机设计了一款智能浇水系统,以温湿度传感器DHT11为感应部件,将检测到的空气温湿度值送入STC89C51单片机,再将其数值输出到LCD液晶显示屏上显示。通过单片机程序设定浇水的上下限值与DHT11送入单片机的空气湿度值相比较,当低于下限值时,单片机输出一个信号控制电磁阀打开,开始浇水,高于上限值时由单片机输出一个信号控制电磁阀关闭,停止浇水。实时时间的显示与定时控制是由单片机从时钟芯片DS1302读入,通过程序设定的定时浇水的时间与浇水的量进行浇水,可以实现花卉的自动浇水功能。     

基于AT89S52的家庭智能浇花器的设计

设计了家庭智能浇花器,实现花卉的自动浇水.利用单片机实现自动浇花,根据不同的花种,设置了不同的控制方式,即定时定量浇花方式与根据湿度浇花.定时定量浇花是实现每天在规定的时间自动打开电磁阀浇花,根据不同的花卉所需水量不同,用一个按钮来设置浇花时间的长短,即电磁阀打开的时间,其余时间电磁阀闭合,水流不经过;根据湿度控制浇花...     

一种基于DHT11的家用自动浇花电路的设计

采用单片机STC89C51单片机和DHT11温湿度传感器设计了一种家用浇花电路,可以实现花卉的自动和手动浇水。该电路具有结构简单、性能可靠,成本低廉等特点。     

基于单片机控制的多功能电动车自行车智能保护仪的设计与实现

在目前全球污染和温室效应越来越严重的情况下,发展一种新型的无污染、无噪音、无油耗的交通工具已成为世界交通业的迫切问题.电动自行车的出现使人们看到了解决城市交通污染问题的希望,而环保高效的电动自行车越来越受到人们的青睐.针对电动自行车硬件电路存在的问题,结合现代电子技术、单片机技术和智能传感器技术,对电动自行车系统的硬件电路进行创新设计和开发.设计了一种基于AT89C2051单片机的电动自行车的蓄电池的声光监视、助力充电器、调速控制电路和防盗装置于一体的多功能保护仪.多功能电动自行车保护仪是一种设计方法新颖、可控性好、稳定性高,并具有测量结果自动保存和自动报警等功能.     

基于AT89S52单片机的花卉自动浇灌系统的设计

为设计一种方便家庭使用的花卉自动浇灌装置,利用AT89S52单片机进行可编程控制,结合外围温度传感器、蒸发罐、控制信号、按键、报警电路,实现了根据不同的光照、温度等条件自动调节浇水时间间隔,低温天气下自动停止浇灌,报警电路提醒用户及时对花草采取防冻措施。该系统的设计结构模块化管理,便于后期扩展,硬件成本低,适合家庭用户使用。     

CCD固体摄象测量仪的设计

本文介绍了一种国产化的CCD多功能固体摄象测量仪,说明了它的工作原理,食品设计考虑,仪器基本组成和性能指标,该仪器现已正式生产并成功地应用于钢厂钢坯的自动定长生产控制中.     

方位录取系统的设计与实现

雷达中的方位录取系统会直接影响到雷达的测量准确度,为了实现自动录取多种不同的角度传感器送出的天线方位角信息,本文设计了一种多功能的方位录取系统。介绍了角度传感器输出信号的测量原理、多功能方位信息处理单元的结构组成以及定北仪的工作原理,阐述了该方位录取系统的主要硬件实现电路和数据融合处理的工作流程。在实际应用中证明了该系统完全满足雷达的准确度要求。     

基于单片机的智能浇水花架设计与实践

为了方便居家花卉养殖,文章设计了一款智能浇水花架,能根据土壤的干湿程度和植物的需水程度智能浇水。在土壤内放置的湿度传感器感会将采集到的土壤湿度值送入MSP430单片机,当土壤湿度低于理想湿度,水阀打开,实现智能灌浇。水箱里放置水位传感器,当水位低于设定值时,声光报警装置启动。     

土壤湿度智能化监控装置设计

针对节水灌溉问题,利用单片机实现智能化自动浇灌装置设计,可实时监测、显示土壤湿度值;并根据作物生长特性需要进行适时、适量灌水,可对土壤湿度进行精确控制,优化作物生长环境,提高产量.     

智能化浇灌系统的设计与实现

为了解决因无人照料导致植物枯萎及水资源高效利用的问题,设计了一种适用室内盆栽使用的智能化浇灌系统。该设计以STC89C54RD单片机为核心,结合外围温度传感器、土壤湿度测量电路及浇水器电路,实现了根据不同的土壤类型、室内环境温度及土壤湿度的条件对多盆花卉进行独立智能调节浇水量的浇灌操作和手动定时浇灌功能。实验结果表明,本系统能够在不同土壤和外部温度条件下,实现对多盆盆栽进行浇灌功能的目的,验证了智能浇灌系统的可行性。     

一种天线智能适配装置的设计

设计一种能够自动检测多副天线发射效率和识别接收信号强弱能力以及自动切换天线的智能型装置。利用单片机、全数字化控制、汉化显示等技术，完成天线的检测与自动切换及报警等功能，并用于短波通信。     

3D Printed Fractal Metamaterials with Tunable Mechanical Properties and Shape Reconfiguration

Lattice metamaterials constructed by curved microstructures exhibit large stretchability and are promising in soft electronics and soft robotics. Fractal structures are particularly efficient in improving stretchability as it shows multiple-order uncurling. However, the development of fractal metamaterials is hindered by hierarchical structures and large deformations. In this study, a design framework combining experiments, hierarchical theoretical models, and finite element simulations is developed to program the mechanical behaviors of fractal metamaterials. For 3D printing, a digital design tool is developed to visualize the structure and automatically generate the manufacturing representations. Results show that large stretchability (≈360%), bionic stress–strain curve matching, and imperfection insensitivity can be programmed by tuning the geometric parameters. An integrated device of an electromyogram sensor embedded in an imperfection-insensitive fractal metamaterial that matches the J-shaped stress–strain curve of human skin is demonstrated. Light-emitting diode devices based on fractal metamaterial with shape reconfiguration are also presented. This st paves a new way to realize multifunctional soft devices using fractal metamaterials.     

Smart, active, and concealable antenna array for portable television reception

This paper describes an array which is concealable with a TV set or set-top box. The array is made of small active antennas which can provide space and polarization diversity by phase switching alone. The array can be manually or automatically controlled to maximize the signal-noise ratio of the desired channel and minimize the interference from undesired channels. The combination of automatically adjustable dual diversity and small physical size makes this device suitable for mobile reception.     

Carbon Nanotube Based Multifunctional Ambipolar Transistors for AC Applications

Field‐effect transistors (FETs) fabricated on large diameter carbon nanotubes (CNTs) present typical ambipolar transfer characteristics owing to the small band‐gap of CNTs. Depending on the DC biasing condition, the ambipolar FET can work in three different regions, and then can be used as the core to realize multifunctional AC circuits. The CNT FET based circuits can work as a high‐efficiency ambipolar frequency doubler in the ambipolar transfer region, and also can function as in‐phase amplifier and inverted amplifier in the linear transfer region. Due to current saturation of the CNT FET, an AC amplifier with a voltage gain of 2 is realized when the device works in the linear transfer region. Achieving an actual amplification and frequency doubling functions indicates that complicated radio frequency circuits or systems can be constructed based on just one kind of device: ambipolar CNT FETs.     

Nanotechnology‐Enabled Closed Loop Insulin Delivery Device: In Vitro and In Vivo Evaluation of Glucose‐Regulated Insulin Release for Diabetes Control

Recently, a new multifunctional, bio‐inorganic nanocomposite membrane with the ability to self‐regulate the release of insulin in response to blood glucose (BG) levels was reported. Herein, the application of this material as part of a small, implantable, closed‐loop insulin delivery device designed to continuously monitor BG concentrations and regulate insulin release is proposed. The insulin delivery device consists of a nanocomposite glucose‐responsive plug covalently bound to an insulin reservoir made of surface‐modified silicone. The plug is prepared with crosslinked bovine serum albumin (BSA) and enzymes (glucose oxidase (GOx) and catalase (CAT)), pH‐responsive hydrogel nanoparticles, and multifunctional MnO₂ nanoparticles. The plug functions both as a glucose sensor and controlled delivery unit to release higher rates of insulin from the reservoir in response to hyperglycemic BG levels and basal insulin rates at normal BG concentration. The surfaces of the device are modified by silanization followed by PEGylation to ensure its safety and biocompatibility and the stability of encased insulin. Our results show that insulin release can be modulated in vitro in response to glucose concentrations. In vivo experiments show that the glycemia of diabetic rats can be controlled with implantation of the prototype device. The glucose‐responsiveness of the device is also demonstrated by rapid drop in BG level after challenging diabetic rats with bolus injection of glucose solution. In addition, it is demonstrated that surface PEGylation of the device is necessary for reducing the immune response of the host to the implanted foreign object and maintaining insulin stability and bioactivity. With this molecular architecture and the bio‐inorganic nanocomposite plug, the device has the ability to maintain normal BG levels in diabetic rats.