I can remember buying my first electronic calculator. I was teaching a graduate level statistics course and I had to have a calculator with a square root function. Back in the late 1960s, that was a pretty high-end requirement for a calculator. I managed to purchase one at the “educational discount price” of $149.95! Now, I look down at my desk at an ATmega2560 that is half the size for less than a quarter of the cost and think of all the possibilities built into that piece of hardware. I am amazed by what has happened to everything from toasters to car engines. Who-da-thunk-it 40 years ago?
標(biāo)簽： Beginning Arduino for
上傳時間： 2020-06-09
上傳用戶：shancjb
In the early days, embedded systems were built primarily by engineers in a pretty exclusive club. Embedded devices and software tools were expensive, and building a functional prototype required significant software engineering and electrical engineering experience.
標(biāo)簽： Arduino Gadgets Make Bots and
上傳時間： 2020-06-09
上傳用戶：shancjb
Since its release, Arduino has become more than just a development platform; it has become a culture built around the idea of open source and open hardware, and one that is reimagining computer science and education. Arduino has opened hardware development by making the starting skills easy to obtain, but retaining the complexities of real-world application. This combination makes Arduino a perfect environment for school students, seasoned developers, and designers. This is the first Arduino book to hold the title of “Pro,” and demonstrates skills and concepts that are used by developers in a more advanced setting. Going beyond projects, this book provides examples that demonstrate concepts that can be easily integrated into many different projects and provide inspiration for future ones. The focus of this book is as a transition from the intermediate to the professional.
上傳時間： 2020-06-09
上傳用戶：shancjb
可測試性設(shè)計（Design-For-Testability，DFT）已經(jīng)成為芯片設(shè)計中不可或缺的重要組成部分。它通過在芯片的邏輯設(shè)計中加入測試邏輯提高芯片的可測試性。在高性能通用 CPU 的設(shè)計中，可測試性設(shè)計技術(shù)得到了廣泛的應(yīng)用。本文結(jié)合幾款流行的 CPU，綜述了可應(yīng)用于通用 CPU 等高性能芯片設(shè)計中的各種可測試性方法，包括掃描設(shè)計（Scan Design），內(nèi)建自測試（built-In Self-Test，BIST），測試點(diǎn)插入（Test Point Insertion），與 IEEE 1149.1標(biāo)準(zhǔn)兼容的邊界掃描設(shè)計（Boundary Scan Design，BSD）等技術(shù)。
標(biāo)簽： 可測試性設(shè)計 CPU
上傳時間： 2021-10-15
上傳用戶：
NCP1399 是高性能電流模式控制器，半橋諧 變換器。此控制器實(shí)現(xiàn) 600 V 門驅(qū)動、 簡化布 局和減少外部組件計數(shù) 。built - in 和 Brown - Out 輸入函數(shù)簡化了執(zhí)行在所有應(yīng)用程序的控制器。 在 PFC 前階段的應(yīng)用 NCP1399 需要設(shè)有專用的 輸出驅(qū)動 PFC 前級控制器。此功能專用 skip-mode 技術(shù)進(jìn)一步提高輕負(fù)載效率的整個應(yīng) 用程序。 NCP1399 提供全套的保護(hù)功能允許安全 運(yùn)行在任何應(yīng)用程序中。這包括：過載保護(hù)，過 流保護(hù)以防止硬開關(guān)周期， brown- out 檢測，打 開光電耦合器檢測， 死區(qū)自動調(diào)整， 過電壓（OVP） 和 (OTP) 過溫保護(hù)
上傳時間： 2021-12-17
上傳用戶：qingfengchizhu
The PW5300 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.2? powerMOSFET make this regulator highly power efficient. The internal compensation network alsominimizes as much as 6 external component counts. The non-inverting input of error amplifierconnects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrushcurrent. The PW5300 is available in the SOT23-6L package and provides space-saving PCB for theapplication fields
標(biāo)簽： pw5300
上傳時間： 2022-02-11
上傳用戶：jiabin
目的:自主研制一款超聲手術(shù)刀電源控制系統(tǒng),以減少能量的消耗,維持手術(shù)刀的正常溫度。方法:對超聲換能器在諧振附近的等效電路建立模型,并設(shè)計基于數(shù)字信號處理(DSP)的超聲手術(shù)刀的硬件控制系統(tǒng)。結(jié)果:經(jīng)對電源控制系統(tǒng)的電路和工作性能測試,生成的電流和電壓的有效值等參數(shù),能夠及時調(diào)整電源的頻率,并達(dá)到預(yù)期的功能指標(biāo),使超聲手術(shù)刀工作在諧振狀態(tài)。結(jié)論:以DSP為核心設(shè)計的超聲手術(shù)刀電源控制系統(tǒng),測試指標(biāo)均能夠達(dá)到預(yù)期的要求,能夠使系統(tǒng)在諧振狀態(tài)下工作。Objective: To independently develop a power control system of ultrasonic scalpel so as to reduce the energy consumption and maintain the normal temperature of ultrasonic scalpel. Methods: In this paper, the model of equivalent circuit of ultrasonic transducer nearby syntony was built up, and the hardware control system of ultrasonic scalpel based on digital signal processing(DSP) was designed. Results: Through testing the circuit and work performance of power control system, the series of parameters such as effective value and so on which were produced by this system could adjust frequency of power source in time and attain anticipative functional indicator, and it took the ultrasonic scalpel to work in syntonic situation. Conclusion: The tested indicators of power control system of ultrasonic scalpel based on the kernel design of DSP can attain anticipative requirement, and can take this system to work in syntonic situation.
標(biāo)簽： 數(shù)字信號處理 超聲手術(shù)刀 電源控制
上傳時間： 2022-04-03
上傳用戶：bluedrops
超聲波換能器作為一種實(shí)用的檢測手段，能實(shí)現(xiàn)聲波所攜帶的信息和電能之間轉(zhuǎn)換。它的性能優(yōu)良，價格低廉，操作方便，易于調(diào)試，因此在工農(nóng)業(yè)生產(chǎn)中發(fā)揮著重要的作用。但目前換能器驅(qū)動電路的發(fā)射頻率多為40 kHz，本文針對1 MHz的超聲波換能器電路進(jìn)行了設(shè)計，主要介紹了它的發(fā)射驅(qū)動電路和接收驅(qū)動電路的設(shè)計方案，并對它們的功能進(jìn)行了詳細(xì)地說明。最后搭建實(shí)驗(yàn)平臺，并對電路的輸入、輸出模塊進(jìn)行了測試。實(shí)驗(yàn)結(jié)果表明，換能器電路運(yùn)行良好，可以為超聲波高精度測量領(lǐng)域的應(yīng)用提供參考。As a practical means of detection, ultrasonic transducer can realize the conversion between theinformation carried by sound wave and electric energy.It has the advantages of excellent performance,low cost, convenient operation and debugging, so plays an important role in industrial and agriculturalproduction.However, the transmitting frequency of the driving circuit for most transducer is 40 kHz.Thecircuit of 1 MHz ultrasonic transducer is designed In this paper. It mainly introduces the emissive drivingcircuit and the receiving circuit design and the detailed function of them. Finally, the experimentalplatform is built, and the circuit of input and output were tested. Experiments show that the transducer＇ s...
上傳時間： 2022-04-28
上傳用戶：
以STM32F103C8T6為核心,設(shè)計了無刷直流電機(jī)控制器硬件電路。電路主要包括IR2310構(gòu)成的PWM驅(qū)動電路、IRF3808構(gòu)成的逆變電路、增量式旋轉(zhuǎn)編碼構(gòu)成的速度反饋電路?？刂破骶哂蠧AN和RS232通信接口,可與計算機(jī)或PLC構(gòu)成速度或位置伺服系統(tǒng)。利用由xPC目標(biāo)搭建的半實(shí)物仿真平臺對PI參數(shù)進(jìn)行整定。測試了控制器的速度伺服響應(yīng)性能,給定速度為2400rpm時,控制器響應(yīng)時間為0.32s。實(shí)驗(yàn)結(jié)果表明,系統(tǒng)工作可靠,穩(wěn)定性好,響應(yīng)速度快,可以滿足上肢康復(fù)機(jī)器人的機(jī)械臂速度控制性能要求。The hardware circuit of Brushless DC motor controller is designed by taking STM32F103C8T6 as the core,which mainly includes PWM driving circuits made up of IR2310,inverter circuit formed by IRF3808,speed feedback circuit composed of incremental rotary encoder and so on.Speed servo control system or position servo control system can be composed of BLDM controller with computer or PLC through CAN communication interface or RS232 serial communication interface.By using the hardware in the loop simulation platform built by xPC target,the PI parameters are set up.The Speed servo response performance of the controller is tested.When the speed is 2 400 rpm,the response time of the controller is 0...
標(biāo)簽： stm32 無刷直流電機(jī)
上傳時間： 2022-05-07
上傳用戶：
為了實(shí)時檢測血氧量,能使缺氧特別敏感的腦組織或心臟類疾病患者得到及時治療,采用近紅外雙波長透射式光電脈搏血氧測定法,以H橋電路對發(fā)射光源進(jìn)行控制及通用運(yùn)算放大器搭建濾波電路。運(yùn)用參數(shù)理論計算和計算機(jī)仿真結(jié)果相對比的方法,通過Mu ltisim軟件對所設(shè)計電路進(jìn)行仿真,仿真結(jié)果與理論參數(shù)計算相吻合,證明了電路參數(shù)設(shè)計的可行性,為血氧儀的實(shí)物制作提供參考。For real-time detection of oxygen saturation for timely treatment of the brain or heart,which are very sensitive to oxygen inadequacy,the near-infrared wavelengths double photoelectric pulse oximeter transmission method is adopted.The illuminant is controlled with the H bridge circuit and the filter circuit is built with general op-amps.Parameters by theoretical calculation is compared with the computer simulation results in Multisim and satisfactory results are obtained.It is shown that the design of the circuit parameters is feasible and can be a help in making the physical blood-oxygen monitor.
上傳時間： 2022-05-12
上傳用戶：
蟲蟲下載站版權(quán)所有 京ICP備2021023401號-1
