Product Parameters

1. Working voltage: 3.3~30V;

2. Frequency range: 1HZ~150KHZ; (Can be set to 0HZ, representing low output level)

3. Frequency accuracy: The accuracy in each range is about 2%;

4. Signal load capacity: The output current can be around 3.3~30mA;

5. Output amplitude: The PWM amplitude is equal to the supply voltage;

6. Environmental temperature:- 20~+70 ° C.

Product highlights

1. PWM frequency, adjustable duty cycle, suitable for most occasions;

2. LCD display frequency and duty cycle are very clear and easy to adjust

3. Wide frequency range and high accuracy;

4. Can communicate via serial port;

Product Funtion

Hardware preparation

1. Prepare a DC stabilized power supply, oscilloscope, HW-753 module, and several electronic wires.

Circuit connection

Connect the module as shown in the diagram, with a power input of 3.3-30V. Adjust the pulse output frequency and duty cycle, and use an oscilloscope to measure the corresponding channel to observe the waveform

Product Description

PWM output, frequency and duty cycle can be set separately;

The frequency is divided into four ranges and automatically switches:

1. XXX (without decimal point): The minimum unit is 1Hz; Value range 1Hz~999Hz;

The minimum unit of X.XX (decimal point in hundreds) is 0.01kHz, with a value range of 1.00Khz~9.99kHz;

3.XX. X (decimal point to ten): The minimum unit is 0.1Khz; Value range 10.0KHZ~99.9KHZ;

4. X.X.X (decimal point in tens and hundreds): The minimum unit is 1kHz; The value range is 100KHz~150KHz

e. g. Frequency display:

100 represents PWM output of 100Hz pulses;

1.01 represents a pulse of 1.01K output from PWM;

54.1 represents PWM output of 54.1KHz pulses;

1.2.4 represents PWM output of 124K pulses compared to z;

Duty cycle value range: 0~100%;

All setting parameters are saved in case of power failure.

Parameter settings

The module has 4 independent buttons for setting frequency and duty cycle, supporting short press (increase or decrease by one unit) and long press (quickly increase or decrease). It is very simple, and the parameters are automatically saved after setting, and will not be lost in case of power failure.

Scope of application

1. Used as a square wave signal generator to generate square wave signals for experimental development;

2. Used to generate square wave signals for controlling motor drivers;

3. Generate adjustable pulses for use by MCU;

4. Generate adjustable pulses to control related circuits (such as PWM dimming and speed regulation applications).

Serial port control (single-chip TTL level communication)

Product Use

Communication standard: 9600 bps Data bits: 8

Stop position: 1

Checkpoint: none

Flow control: none

1. 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)

2. Set the duty cycle of PWM

"DXXX": Set the duty cycle of PWM to XX; (001~100)

For example, D050, set the PWM duty cycle to 50%

3. Read setting parameters

Send a 'read' string to read the set parameters.

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