2 CH PWM PULSE SQ. WAVEFORM GEN

Description

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 using the straightforward LED display and set/up/down buttons. It can also be programmed through its serial RS-232 interface.

Applications 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:
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: Default 5V P-P, can be varied with an external power supply input
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 Port:

• “S1DXXXT”:set PWM1 duty cycle as XXX；(001~100)
• “S2DXXXT”:set PWM2 duty cycle as XXX；(001~100)

Setting successfully back: DOWN

Setting unsuccessfully back: FALL