Pc Based Data Acquisition System Using Spi And I2c Protocol Tutorial Pdf


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Data acquisition system project is a fine combination of analog and digital electronics. This project is designed so as to fulfill the requirements of the industry applications, home applications. The project consists of parameters monitoring, parameter storage which is also know as Data Logger.

Journal of Measurements in Engineering, Vol. In this paper, we present the design steps of a low cost multi-channel accelerometer system accompanied with an open-source data acquisition software. The developed system is tested for synchronization and reliability via shake-table tests and results are presented.

Microcontroller based 4 channel Data acquisition system

Chapter Serial Interfacing. This chapter provides an introduction to serial interfacing, which means we send one bit at time. Serial communication is prevalent in both the computer industry in general and the embedded industry in specific. There are many serial protocols, but in this course we will show you one of the first and simplest protocols that transmit one bit at a time. We will use busy-wait to synchronize the software with the hardware.

Learning Objectives:. Video Introduction to Serial Communication. Before we begin define serial communication, let's begin by introducing some performance measures. As engineers and scientists we are constantly making choices as we design new product or upgrade existing systems. A performance measure is a quantitative metric that the goodness of the system. Latency includes hardware delays in the digital hardware plus computer software delays.

For an input device, software latency or software response time is the time between new input data ready and the software reading the data. For an output device, latency is the delay from output device idle and the software giving the device new data to output.

In this book, we will also have periodic events. For example, in our data acquisition systems, we wish to invoke the analog to digital converter ADC at a fixed time interval. In this way we can collect a sequence of digital values that approximate the continuous analog signal. Software latency in this case is the time between when the ADC conversion is supposed to be started, and when it is actually started. The microcomputer-based control system also employs periodic software processing.

Similar to the data acquisition system, the latency in a control system is the time between when the control software is supposed to be run, and when it is actually run. In other words, the software response time is small and bounded. Furthermore, this bound is small enough to satisfy overall specification of the system, such as no lost data. Bandwidth can be reported as an overall average or a short-term maximum. Priority determines the order of service when two or more requests are made simultaneously.

Priority also determines if a high-priority request should be allowed to suspend a low priority request that is currently being processed. We may also wish to implement equal priority, so that no one device can monopolize the computer. In some computer literature, the term "soft-real-time" is used to describe a system that supports priority. One of the choices the designer must make is the algorithm for how the software synchronizes with the hardware.

The methods are discussed in the following paragraphs. Device Communication requires Synchronization. For an input device, the software triggers starts the external input hardware, waits a specified time, then reads data from device.

Blind cycle synchronization for an input device is shown on the left part of Figure For an output device, shown on the left part of Figure This method works because the LCD speed is short and predictable. Another good example of blind-cycle synchronization is spinning a stepper motor. Figure The output device sets a flag when it has finished outputting the last data.

Use the following tool to see how blind-cycle synchronization works. You will need to enter a number between to simulate the timing behavior of the device. For an input device, the software waits until the input device has new data, and then reads it from the input device, see the middle parts of Figures For an output device, the software writes data, triggers the output device then waits until the device is finished. Another approach to output device interfacing is for the software to wait until the output device has finished the previous output, write data, and then trigger the device.

Busy-wait synchronization will be used in situations where the software system is relatively simple and real-time response is not important. The UART software in this chapter will use busy-wait synchronization. Use the following tool to see how busy-wait synchronization works. You will press the "Ready" button to simulate the device being ready. An interrupt uses hardware to cause special software execution. With an input device, the hardware will request an interrupt when input device has new data.

The software interrupt service will read from the input device and save in global RAM, see the right parts of Figures With an output device, the hardware will request an interrupt when the output device is idle. The software interrupt service will get data from a global structure, and then write to the device. Sometimes we configure the hardware timer to request interrupts on a periodic basis. The software interrupt service will perform a special function.

A data acquisition system needs to read the ADC at a regular rate. Interrupt synchronization will be used in situations where the system is fairly complex e.

Interrupts will be presented in Chapter Use the following tool to see how interrupt-based synchronization works. With an input device, a ready flag is set when the input device has new data. At the next periodic interrupt after an input flag is set, the software will read the data and save them in global RAM.

With an output device, a ready flag is set when the output device is idle. At the next periodic interrupt after an output flag is set, the software will get data from a global structure, and write it. With an input device, the hardware will request a DMA transfer when the input device has new data. With an output device, the hardware will request a DMA transfer when the output device is idle.

The DMA controller will get data from memory, and then write it to the device. Sometimes we configure the hardware timer to request DMA transfers on a periodic basis. DMA can be used to implement a high-speed data acquisition system. DMA synchronization will be used in situations where high bandwidth and low latency are important. DMA will not be covered in this introductory class. One can think of the hardware being in one of three states. The idle state is when the device is disabled or inactive.

When active not idle the hardware toggles between the busy and ready states. The interface includes a flag specifying either busy 0 or ready 1 status. Hardware-software synchronization revolves around this flag:. For an input device, a status flag is set when new input data is available. Once the software recognizes the input device has new data, it will read the data and ask the input device to create more data.

It is the busy to ready state transition that signals to the software that the hardware task is complete, and now software service is required.

Often the simple process of reading the data will clear the flag and request another input. Therefore, we need synchronization, which is the process of the hardware and software waiting for each other in a manner such that data is properly transmitted. A way to visualize this synchronization is to draw a state versus time plot of the activities of the hardware and software.

For an input device, the software begins by waiting for new input. When the input device is busy it is in the process of creating new input. When the input device is ready, new data is available. When the input device makes the transition from busy to ready, it releases the software to go forward. In a similar way, when the software accepts the input, it can release the input device hardware.

The arrows in Figure In this example, the time for the software to read and process the data is less than the time for the input device to create new input.

If the input device were faster than the software, then the software waiting time would be zero. This situation is called CPU bound meaning the bandwidth is limited by the speed of the executing software. In real systems the bandwidth depends on both the hardware and the software.

Another characteristic of real systems is the data can vary over time, like car traffic arriving and leaving a road intersection. These modules may be input devices, output devices or software. In particular, it can handle situations where there is an increase or decrease in the rates at which data is produced or consumed. The FIFO maintains the order of the data, as it passes through the buffer.

We can think of a FIFO like a line at the post office. There is space in the lobby for a finite number of people to wait. As customers enter the post office they get in line at the end put onto FIFO. As the postal worker services the customers, people at the front leave the line get from the FIFO.

It is bad situation a serious error if the waiting room becomes full and there is no room for people to wait full FIFO. However, if there are no customers waiting empty FIFO the postal worker sits idle.

Data Acquisition Systems From Fundamentals to Applied Design

Ftdi I2c. In applications like interfacing a I2C based sensors and I2C based acquisition these FT-X series devices can play a major role in PC or portable device based control and operation. FTDI Chip specialises in the design and delivery of advanced silicon and software solutions. My setup is as shown below. Received data can be displayed by any terminal program on PC computer. Ftdi ftx basic and 5v systems.

In , it was announced that I2C could support a data rate of KHz with bit addressing, this has increased the number of. Add to cart. Through this ADC module, Raspberry Pi can easily use a wide range of Gravity series analog sensors to measure various signals, and perceive this world. Quantity: More than 10 lots available 5 items per. The microcontroller does not have an inbuilt ADC so we have to add externally through I2C protocol.

Toggle navigation Arduino Library List. AGirs A Girs infrared server for the Arduino platform. ALog Low-power general-purpose data logger library, written for the Arduino-based ALog but expandable to other devices. Perfect for debugging purposes. AccelStepper Allows Arduino boards to control a variety of stepper motors.

Chapter Serial Interfacing. This chapter provides an introduction to serial interfacing, which means we send one bit at time. Serial communication is prevalent in both the computer industry in general and the embedded industry in specific. There are many serial protocols, but in this course we will show you one of the first and simplest protocols that transmit one bit at a time.

JVE Conferences

Нигде не должно остаться даже намека на Цифровую крепость. Сьюзан снова завладели прежние сомнения: правильно ли они поступают, решив сохранить ключ и взломать Цифровую крепость. Ей было не по себе, хотя пока, можно сказать, им сопутствовала удача. Чудесным образом Северная Дакота обнаружился прямо под носом и теперь попал в западню. Правда, оставалась еще одна проблема - Дэвид до сих пор не нашел второй экземпляр ключа.

 Справедливость восторжествовала, как в дешевой пьесе. - Успокойтесь, Джабба, - приказал директор, - и доложите ситуацию. Насколько опасен вирус. Джабба пристально посмотрел на директора и вдруг разразился смехом.

На мгновение ей показалось, что на нее были устремлены горящие глаза Хейла, но прикосновение руки оказалось на удивление мягким. Это был Стратмор. Лицо его снизу подсвечивалось маленьким предметом, который он извлек из кармана.

 Это совсем просто, Сьюзан, мы позволим правде выйти за эти стены.

У Бринкерхоффа был такой вид, словно он вот-вот лишится чувств. - Десять секунд. Глаза Сьюзан неотрывно смотрели на Танкадо. Отчаяние.

 А что, если мистер Танкадо перестанет быть фактором, который следует принимать во внимание. Нуматака чуть не расхохотался, но в голосе звонившего слышалась подозрительная решимость. - Если Танкадо перестанет быть фактором? - вслух размышлял Нуматака.  - Тогда мы с вами придем к соглашению. - Буду держать вас в курсе, - произнес голос, и вслед за этим в трубке раздались короткие гудки.

Сьюзан посмотрела на решетчатую дверь, ведущую в кухню, и в тот же миг поняла, что означает этот запах. Запах одеколона и пота.

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