AD acquisition module /16 bit -4 channel ADC conversion serial port output
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About A/DC had to say the secret
The A/D converter is used to transform the analog quantity into digital quantity through certain circuit. Analog signal can be voltage, current and other electrical signals, but also can be pressure, temperature, humidity, displacement, sound and other non electrical signal. But before the A/D conversion, the input signal to the A/D converter must be converted to a voltage signal by a variety of sensors. A/DC (analog signal / digital signal conversion) is of great importance, it can be said that the computer or other digital devices in the processing of almost all digital signals must pass through A/DC! It is the bridge between the analog devices and digital devices!
After A/D conversion, the output of the digital signal can be 8, 10, 12, 14, 16, 24, etc.. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ MCU / electronic enthusiasts, learners, project development, software / hardware engineers required! This board is available serial direct download, without programmer emulator. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Basic parameters of 4 channel 16 bit (16bit) C A/D conversion board: Size: X (long) 51mm PCB:76mm (wide) Plate thickness: 1.6mm Color:ADC red system Chip model: SCM: STM32F103C8T6 Power supply voltage: Board 5V and 3.3V voltage regulator,External DC power supply using 9V~12V, there is anti – Anti – power supply of the diode protection, power supply board is not connected to the board,MomI don’t have to worry about connecting the power supply to the board. Serial port chip:SIPX3232Or compatible chip Crystal frequency: 8MHZ, 9 times the internal chip, PCB board operating frequency of up to 72MHZ.
STM32F103X8 microcontroller introduction The enhanced STM32F103x8 series with high performance ARM Cortex -M3 32 RISC kernel, the frequency of 72MHz, the built-in high speed memory (up to 128K bytes of flash memory and 20K bytes of SRAM), enhanced I/O port and connected to two APB bus peripheral rich. All models of the device contains 12 2 bit ADC, 3 universal 16 bit timer and 1 PWM timer, also includes standard and advanced communication interface: as many as 2 I2C interface and SPI interface, 3 USART interface, oneUSB interface and a CAN interface. STM32F103xx medium capacity enhancement series products supply voltage of 2.0V to 3.6V, including -40 degrees C to +85 degrees C temperature range and Extended temperature range of -40 degrees C to +105 degrees C. A series of power saving mode to ensure the requirement of low power consumption. STM32F103xx medium capacity enhancement series products offer 6 different packages from 36 feet to 100 feet.The configuration of peripheral devices in the device is not the same. The following gives the basic introduction of all the peripherals in the series. These rich peripherals configuration, making the STM32F103xx product capacity enhanced series microcontroller suitable for a variety of applications: function – kernel: ARM 32 bit Cortex -M3 CPU And the highest working frequency of 72MHz, in the 0 week wait for memory Period of access to 1.25DMips/MHz (Dhrystone 2.1) Single cycle multiplication and division of hardware. – memory – from the flash program memory 64K or 128K bytes Up to 20K bytes of SRAM. – clock, reset and power management – 2 ~ 3.6 volt power supply and the I/O pin – on / off reset (POR/PDR), programmable voltage monitoring Device (PVD) – 4 ~ 16MHz crystal oscillator – embedded by RC oscillator factory calibration 8MHz RC oscillator – embedded with the calibration of 40kHz – CPU clock PLL 32kHz RTC – band oscillator calibration function – low power consumption And sleep, stop and standby mode – VBAT RTC register and reserve power supply In debug mode Single – serial debugging (SWD) and JTAG interface
4 channel 16 bit (16bit) A/DC conversion boardFunction description:
1, a total of 4 channels of analog voltage conversion to digital signals, through the serial port to send to the PC, as a data acquisition. Single ended input modeCollection voltage range0 ~ 5VDC voltage, using the difference method can collect +5V to -5V voltage value. 2, the board supporting the4 mode microcontroller program, the user can be downloaded into the microcontroller according to the need, or specify which kind of download by us before shipment.The purchase of the board can provide all the procedures and schematicsAnd related component data. One by one to introduce the development of the board of the 4 models: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Program mode 1:PC issued a directive, the development board to return a ADC data For the hardware is not very understanding of software developers, do not need to understand the complexity of the microcontroller and AD conversion principle, as long asSend a simple order through the serial port, you can return the ADC conversion data, with the development of the host computer software, real-time display of the collection of voltage values. For the microcontroller engineers, this board is a good platform, itContains the smallest single-chip system,All the IO ports have been brought out., users can not only use the AD conversion function, but also on the basis of the development of other functions to meet the needs of the development. With the board to provide the development of relevant information, including reference procedures, schematics, etc.. PC (can be PC, MCU master, DSP, FPGA board and so on) software to send a command, microcontroller ADC acquisition board to return a corresponding data acquisition (16 band data)
1, a total ofThe analog voltage of the 4 channel is converted to digital signal, only through the serial port to send a command to the host computer, you can get a group of 2 bytes of ADC 16BIT conversion of 16 decimal value and real-time voltage value.
2, PC serial port to send the following data(115200 baud rate, 8 bit data, no parity), the conversion board to start a ADC 16bit conversion, and the collected data back to the PC, as the data is 16 bits, so it is divided into 2 bytes sent, high byte first, low byte in the post, right aligned data.
Send instruction format:
A0 returns: channel 0 (AD0) data A1 returns: Channel 1 (AD1) data A2 returns: Channel 2 (AD2) data A3 returns: Channel 3 (AD3) data Return data format: To send more than one instruction, the data in the following format will be returned (4 bytes): 3F 3D BB A0 Meaning A0 – channel number (A0~A3) 3F 3D – ADC 16 hexadecimal data (0X0000~0XFFFF) BB – end byte (fixed) Serial debugging assistant display interface is as follows: So the question is –
???How to convert the 16 data collected into voltage (for the host computer software reference):
The so-called 16 bit ADC, the input voltage is divided into 2 of the 16 party data, namely 65536 data (10 hexadecimal 0–65535,16 hex 0X0000–0XFFFF). Because this model adopts the single end input ADC conversion chip AD conversion precision is 15 bits (only 0X0000~0X7FFF in this period, therefore, the data) the data acquisition mode is in the range of 0–32767 (15 2), a total of 32768 data.
For example, the returned data: 67 C0
Calculation of the voltage value formula based on the returned data:
ADC converted voltage value = (high byte *256+ low byte)/32768) *6.144;
H 67C0 converted into 10 binary data is 25650 Then the voltage is calculated as: (25650/32768) *6.144=4.8093V For example, the returned data is: 3E 40 (3E to 10 decimal is 62,40 to 10 decimal is 64) ((256*62+64) /32768) *6.144=2.9880V When dealing with the user machine, can determine the channel number, according to the above data, marks the end of the board, for the convenience of the user to debug, write a simple PC software (based on DE7), the interface is as follows: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Program mode 2: acquisition of single channel ADC data. Serial data protocol:115200Baud rate,1Starting position,8Data bits, no verification,1Stop bit. Continuous acquisition of single channel AN0 for ADC conversion of the analog voltage, and the calculation for the voltage value of the converted data, in the form of ASCII code, the data sent through the serial port. This mode with the serial assistant software can directly read voltage,Suitable for rapid development of engineering use, because users do not need to learn more about the working process of SCM hardware.
Collected data show the following example, the acquisition is the voltage received zeroth channels (AN0) on the measured results, the measurement accuracy of 0.001V (1mV) range of data is very stable.
The transmission is the ASCII code, so the PC serial port software should choose “display”, don’t choose 16 hexadecimal display, or garbled. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Program mode 3: continuous acquisition of four channel ADC data. Serial data protocol:115200Baud rate,1Starting position,8Data bits, no verification,1Stop bit. The 4 channel analog voltage of the ADC converter 16 continuous acquisition, and the calculation for the voltage value of the converted data, in the form of ASCII code, the data sent through the serial port. This mode with the serial assistant software also can directly read voltage, suitable for rapid development of engineering use, because the user does not need to process a detailed understanding of the hardware. Collected data show the following example: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Program mode 4:2 channel (CH0, CH1) differential input mode, positive and negative voltage acquisition. Differential signal voltage of positive and negative 5V. As a differential input mode, the input pin is configured as follows: AN0: CH0+ AN1: CH0- AN2: CH1+ AN3: CH1-
Buyers in the purchase when you can specify what kind of model to download the program (note that the message when the film), the default is not specified before the delivery of the model is to download the model 3. If the buyer wants to download the program, we can provide documents and technical support.
For the board to download methods and testing, please refer to the following Youku video:
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Component description diagram
* Note: the input port of the ADC board still has a voltage in the suspended state, so there is a sense that the input port of the input port can be connected to the ground without the input port. *
Now purchase this board, giving the following information:
Board quality is very good, complex formula calculation has been completed in the microcontroller, the user directly from the serial port to read the ADC data, the use of very simple! If you intend to purchase can be photographed directly, do not intend to buy, you can collect or put into the shopping cart, in order to prepare for the time needed to buy. Taobao Taobao, there are a lot of things in the entity can not buy, can not be asked for you and me, is a kind of fate, but also very grateful to you to come here!
1,4 channel 16 bit AD conversion module 1
2, DuPont line 8
3, serial communication line 1
4, the relevant information on the board, please accept the goods as soon as possible after the test function, if the function is normal, pleaseConfirm receipt,howeverAfter the customer service staff to inform the mailbox number, customer service will send the information to the buyer. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The use of the plate connected to the computer when in use, users need to determine whether your computer with a 9 pin serial port (see behind the computer), if there is no need to use the USB serial port, serial port module, can be used, the store has the conversion module, can click on the following link to buy: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Need 12V power, please take the following link:
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