Bộ phát xung PMW-XY V4

(Mã SP:PVN3965)

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Giá

120.000₫

Mô tả :

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Bộ phát xung PMW-XY V4

Mô tả sản phẩm

Miêu Tả máy phát xung XY-PWM

The PWM Signal Generator Module combines an accurate 0-150kHz PWM square-wave generator with pushbutton controls and LCD display that shows frequency and duty cycle..

Chức năng và đặc tính máy phát xung XY-PWM

0-150kHz output frequency range
0-100% duty cycle
Square wave output
3.3-30V operation and output pulse amplitude
Simple pushbutton interface
LCD display of frequency and duty cycle
5-30mA maximum current output
Serial TTL interface available

This is a nice little module that can be used as a flexible square wave generator for conducting experiments, testing and controlling devices that require a PWM input. Having the display and simple pushbutton interface makes it easy to set. Adding an output driver allows it to drive motors, solenoids, servos, dim LEDs and other pulse applications. The panel mount enclosure provides some protection and allows for mounting the unit in a panel if desired.

Phương pháp cấp nguồn máy phát xung XY-PWM

The module can operate from 3.3 to 30V power input on the V+ connection. V- is the ground connection.
The V+ input has a Schottky reverse polarity protection diode. The module logic circuits are powered from a 3.3V regulator, so the V+ voltage is usually selected to set the amplitude that is needed for the PWM output. If the PWM output will be used with 5V logic, the module should be powered from 5V.
Below 4V, the LCD backlight will start to dim, but the module will continue to work down to 3.3V. The module draws about 20mA from the power source under typical 5V operation.

Tùy chỉnh xung PWM ngõ ra qua nút nhấn

PWM Signal Generator Panel Mount Module - Frequency Buttons The frequency of the PWM output can be set over the range from 0Hz to 150kHz by pressing the FREQ Up / Down buttons. Holding the buttons down accelerates the frequency change. Pressing the down arrow increases frequency while pressing the up arrow decreases the frequency which is somewhat counter-intuitive

When the output is being adjusted, the display shows SET. When no adjustments are being made, it displays OUT.

The current frequency is shown in the upper half of the display with the decimal point indicating the range that is being displayed.

If the display shows XXX, the value is in Hz. A display of 500 indicated 500Hz. The value can be adjusted in increments of 1Hz over the range of 0-999Hz.

If the display shows X.XX, the value is in kHz. A display of 1.00 indicates 1kHz. The value can be adjusted in increments of 10Hz over the range of 1.00kHz – 9.99kHz.

If the display shows XX.X, the value is in tens of kHz. A display of 10.0 indicates 10kHz. The value can be adjusted in increments of 100Hz over the range of 10.0kHz – 99.9kHz.

If the display shows X.X.X, the value is in hundreds of kHz. A display of 1.0.0 indicates 100kHz. The value can be adjusted in increments of 1kHz over the range of 100kHz – 150kHz. This use of multiple decimal points isn’t the most intuitive way to display the value, but it’s not too bad once you get used to it.

Tùy chỉnh Duty Cycle ngõ ra qua nút nhấn

PWM Signal Generator Panel Mount Module - Duty Cycle Buttons The duty cycle is the amount of time the output signal is HIGH vs LOW. If it is set to 60%, the signal will be HIGH for 60% of the time and LOW for 40% of the time.

The duty cycle can be set over the range of 0-100% by pushing the DUTY Up / Down buttons. Holding the buttons down accelerates the duty cycle change.

Pressing the up arrow increases frequency while pressing the down arrow decreases the frequency as you would expect.

The current duty cycle is shown on the bottom half of the display with a % sign after it.

If the duty cycle is set to 100%, the output will be a constant HIGH.

If the duty cycle is set to 0%, the output will be a constant LOW.

The Frequency and Duty Cycle settings are automatically saved during a power cycle.

Điều khiển và cấu hình qua giao tiếp UART

The module has a serial port which provides control over the basic functionality of the module including setting the frequency and duty cycle as well as reading back the current settings. This port is available via some solder pads on the internal board which will require some soldering to use.

The serial port is 3.3V compatible, so if using with a 5V MCU, you will need to use a logic level shifter on the module RX line to avoid possible damage.

Communications use 9600 baud rate. As with any serial port, the TX/RX lines are cross-connected, so the MCU TX line connects to the module RX and the MCU RX line connects to the module TX. GND connects to the MCU ground and is not needed if the module power and ground are coming from the MCU. The communications protocol is very basic as described below.

–> Cách hiệu chỉnh tần số máy phát xung XY-PWM qua giao tiếp UART

To set the frequency you send the data in the same format that it is displayed on the LCD proceeded by an upper case ‘F’.

- ‘F100‘ = Frequency set to 100Hz
- ‘F1.00‘ = Frequency set to 1kHz
- ‘F10.0‘ = Frequency set to 10kHz
- ‘F1.0.0‘ = Frequency set to 100kHz

The module responds with ‘DOWN‘ if the command was understood and ‘FAIL or FALL‘ if it wasn’t, such as if the command was formatted incorrectly.

–> Cách hiệu chỉnh Duty Cycle qua giao tiếp UART

Dxxx = Set Duty Cycle. To set the duty cycle, you send the desired duty cycle preceeded by an upper case ‘D’. ‘D050‘ = Duty cycle set to 50%

–> Đọc cấu hình qua giao tiếp UART

To read the current settings, you send a lower case ‘read‘. The module will respond with the frequency and duty cycle like this:
read D050 F500

Kết nối

The connections to the module are straightforward with power on the upper left side, serial connections on lower left side and PWM output on the right side.

Note that the VIN+, VIN-, PWM and PWM GND connections have two connection points each. These are all connected internally, so only 1 pin of each needs to be connected. The grounds are also all in common.

V+= Power 3.3 to 30V
V- = Ground
PWM = PWM Output
GND = PWM Ground

Serial Port (labeled on backside of board)

GND = Serial Ground
TXD = Transmit Data out of the module. Connects to MCU RXD
RXD = Receive Data into the module. Connects to MCU TXD

Độ chính xác ngõ ra

The accuracy is pretty good. On a sample basis we measured the following.

- 100Hz / 50% duty cycle measured 100.54Hz with 50.07% / 49.93% duty cycle
- 1kHz / 50% duty cycle measured 1.01kHz with 49.90% / 50.10% duty cycle
- 10kHz / 50% duty cycle measured 10.05kHz with 48.98% / 51.02% duty cycle
- 150kHz / 50% duty cycle measured 151.72kHz with 35.59% / 54.41% duty cycle

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