Electronics for IoT, Prototyping & DIY

2-Channel 5V PWM Pulse / Square Wave Generator Module 1Hz-150KHz Frequency

2-Channel 5V PWM Pulse Square Wave Generator Module 1Hz-150KHz Frequency

This economical 2-channel PWM pulse / square wave generator provides two pulse / square wave outputs with independent control over each channel's duty cycle and frequency, controlled using the straightforward LED display and onboard tactile set/up/down buttons. It can also be programmed externally through its standard Serial RS-232 (COM) interface. The frequency and duty cycle settings are saved when the module is powered off.

The module can be powered by a 5-30V external DC power supply, or through its micro USB 5VDC power supply input.

Applications for the module include:

A square wave generator to generate square wave signals for experimentation and control
Driving stepper motors
Generating adjustable pulses for microcontroller use
Generating adjustable pulses for PWM control of lighting and LEDs

Features and Specifications:

Frequency and duty cycle for each channel can be set individually using the onboard tactile buttons or through its RS-232 serial (COM) interface
Operating Voltage: 5-30V, supports MicroUSB 5V input power
Frequency Range: 1Hz - 150KHz
Frequency Precision: 2%
Output Signal Capacity: Up to 30mA output current
Output Voltage: Same as input voltage, or can be independently varied from 5V to 30V with an external power supply input
Frequency and duty cycle settings are saved when the module is powered off
Dimensions: 44mm x 29mm x 9mm (LxWxH)
Ambient Operating Temperature: -30℃ to 70℃

Operating Parameter Settings:

The module has 3 control buttons: Set, Up, and Down

Short pressing the SET key will step the display through the 4 operating parameter values:

FR1: PWM1 frequency
dU1: PWM1 duty cycle
FR2: PWM2 frequency
dU2: PWM2 duty cycle

When each parameter is selected by pressing the SET button, the parameter name will flash before displaying the value.

After the parameter is selected, press the UP and DOWN buttons to modify the parameter's value.

Duty cycle can be set from 1% to 100% in 1% increments.

The frequency range can be selected before entering the value by long-pressing the SET button (approximately 1 second or longer):

XXX Display (Default): Frequency values from 1Hz - 999Hz frequency range
XX.X Display (1 long press of the SET button): 0.1Khz - 99.9Khz frequency range (i.e. 01.2 = 1.2KHz, 55.5 = 55.5KHz)
X.X.X. Display (2 long presses of the SET button):1Khz~150Khz frequency range (i.e. 0.3.5. = 3.5KHz, 1.0.0. = 100KHz)

Serial Port RS-232 Control:

Communication Standard: 9600 bps
Data Bit: 8
Stop Bit: 1
Verify Bit: None
Flow Control: None

Setting PWM Frequency via the Serial Port:

1."S1FXXXT":set PWM1 frequency as XXX HZ (001~999)
2."S1FXX.XT":set PWM1 frequency as XX.X KHZ (00.1~99.9)
3."S1F:X.X.X.T":set PWM1 frequency as XXX KHZ (0.0.1.~1.5.0.)
4."S1": PWM1
5."S2": PWM2
6."F": Frequency
7."D": Duty cycle
8."T": Stop sign bit

Setting PWM Duty Cycle via the Serial