Proizvedeno u : Aziji

3-channel PWM pulse frequency duty cycle adjustable module square wave rectangular wave signal generator

Module highlights:

3-way PWM output, adjustable frequency, consistent 3-way frequency output, independently adjustable duty cycle, suitable for most occasions;
LCD display frequency and duty cycle, very clear, easy to adjust
Wide frequency range and high accuracy;
Serial port communication
1、 Module description

3-way PWM output, wide frequency range, duty cycle can be adjusted independently in real time;

The frequency is divided into four ranges, with automatic switching:

XXX (no decimal point): the small unit is 1Hz, and the value range is 1Hz~999Hz;
The small unit of X. XX (decimal point is in the hundreds) is 0.01Khz, and the value range is 1.00 Khz~9.99Khz;
XX. X (decimal point is in the tenth place): small unit is 0.1Khz; Value range: 10.0KHz~99.9KHz
X.X.X (decimal places are in tens and hundreds): the small unit is 1 Khz; Value range: 1KHz~150KHz
G. Frequency display: 100 indicates PWM output pulse of 100Hz;
1.01 means PWM output 1.01K pulse;

54.1 represents the pulse of 54.1KHz PWM output;

1.2.4 Pulse indicating PWM output 124KHz;

Value range of duty cycle: 0~, in which A0% is used.

All setting parameters are saved after power failure.

2、 Parameter setting

The module has 8 independent keys, which are used to set the frequency and duty cycle. It supports short press (to increase or decrease a unit) and long press (to increase or decrease quickly). It is very simple. After setting, the parameters are automatically saved and will not be lost in case of power failure.

The 3-way duty cycle keys can be pressed at the same time and adjusted in real time. The LCD displays the duty cycle of the keys pressed later, which is very real-time and can be used for simple duty cycle scanning.

3、 Module parameters:

Working voltage: 3.3~30V;
Frequency range: 1Hz~150KHz;
Frequency accuracy: the accuracy in each range is about 2%;
Signal load capacity: the output current can be about 5~30ma;
Output amplitude: PWM amplitude is equal to power supply voltage;
Ambient temperature: - 20~+70 ℃.
4、 Scope of application:

It is used as a square wave signal generator to generate square wave signals for experimental development;
Square wave signal used to control motor driver;
Generate adjustable pulse for MCU;
Generate adjustable pulses and control related circuits (PWM dimming and speed regulation applications).
5、 Serial port control (single-chip TTL level communication)

Communication standard: 9600 bps Data bit: 8

Stop bit: 1

Check bit: none

Flow control: none

Set the frequency of PWM
`F101`: set the frequency to 101 HZ (001~999)

`F1.05`: set the frequency to 1.05 KHZ (1.00~9.99)

`F10.5`: set the frequency to 10.5KHZ (10.0~99.9)

`F1.0.5`: set the frequency to 105KHZ (1.0.0~1.5.0)

Set the duty cycle of PWM
`Dx: yyy`: set PWM duty cycle x: (1~3) PWM serial number, yyy: (000~100) duty cycle%;

For example, D1:050, set the duty cycle of 1 channel PWM to 50%

Read setting parameters
Send the `read` string to read the set parameters.

The read data format is as follows: F156, D1:052, D2:059, D3:058,

If the setting is successful, it returns: DOWN;

Failed to set, return: FALL.