XY-PWM1 Adjustable PWM Signal Generator, 1Hz–150kHz

Description

XY-PWM1 Adjustable PWM Signal Generator

The XY-PWM1 module generates PWM signals with adjustable frequency and duty cycle. Four buttons control the settings. Short presses make small changes; holding a button changes the value more quickly. Settings are saved automatically.

Module parameters listed by the source

• Operating voltage: 3.3–30 V DC
• Frequency: 1 Hz–150 kHz in normal mode; 1 Hz–15 kHz in precision mode
• Frequency accuracy: 2% (general parameter listed by the source)
• Output current: 5–30 mA (source-listed)
• Output amplitude: equal to the supply voltage (source-listed)
• Operating temperature: −40 to +85 °C
• Dimensions: 79 × 43 × 37 mm

The source gives different frequency-accuracy figures in different sections: 2% in the general parameters, 1% in normal mode and 0.1% in precision mode. Treat these as source claims and confirm actual performance for the board revision. The stated output amplitude equals the supply voltage, so check voltage compatibility with the receiving circuit and observe the listed output-current range.

Operation and applications

A microcontroller generates the PWM signal. The display can show frequency and duty cycle. Applications listed by the source include square-wave experimentation, motor control, MCU applications, PWM speed control and dimming, and TTL serial communication.

Buttons and modes

1. Frequency: use FREQ+ and FREQ− to increase or decrease the frequency. A short press makes a small step; a long press changes it faster.
   • Display XXX (no decimal point): 1–999 Hz.
   • Display X.XX: 1.00–9.99 kHz.
   • Display XX.X: 10.0–99.9 kHz.
   • Display X.X.X: 1–150 kHz, according to the source.
2. Duty cycle: use DUTY+ and DUTY−. Short presses make small steps; long presses change it faster. The listed range is 0–100%, with 1% steps in normal mode and 0.1% in precision mode.
3. Mode: normal mode is listed as 1 Hz–150 kHz; precision mode is 1 Hz–15 kHz. The source states that holding FREQ+ or FREQ− for 10 seconds switches modes.
4. Lock settings: hold DUTY+ or DUTY− for 5 seconds to lock settings and prevent accidental changes.

Serial port settings

• Baud rate: 9600 bps
• Data bits: 8
• Stop bits: 1
• Parity: none
• Flow control: none

Serial commands listed in the source

Set PWM frequency

• F101: set frequency to 101 Hz (001–999)
• F1.05: set frequency to 1.05 kHz (1.00–9.99)
• F10.5: set frequency to 10.5 kHz (10.0–99.9)
• F1.0.5: set frequency to 105 kHz (1.0.0–1.5.0)

Set PWM duty cycle

• DXXX: set the PWM duty cycle to the selected value, listed as 001–100.
• Example: D050 sets a 50% duty cycle.

Read settings

• Send the string read to read the saved settings.
• The source says a successful response is Down and an unsuccessful response is FALL; these response labels are reproduced as listed.