Panel-PWM-Signalgenerator, LCD, 3,3 – 30 V, 5 – 30 mA, 1 Hz – 150 kHz

Panel-mounted PWM signal generator module, intended for applications where a rectangular-wave source with adjustable parameters and permanent value display is required. The module generates a PWM signal with adjustable frequency between 1 Hz and 150 kHz and duty cycle adjustable over the full 0 - 100% range, controlled via a rotary encoder with integrated push button. The display shows both frequency and duty cycle, and the output signal amplitude is equal to the supply voltage, allowing the logic level to be adapted to the system in which it is integrated.

The frequency is automatically organized into four display categories, each with its own adjustment resolution. The NNN format, without a decimal point, covers the 1 Hz - 999 Hz range with 1 Hz resolution. The N.NN format, with the decimal point in the hundreds position, covers the 1.00 kHz - 9.99 kHz range with 0.01 kHz resolution. The NN.N format covers the 10.0 kHz - 99.9 kHz range with 0.1 kHz resolution, and the N.N.N format covers the 1 kHz - 150 kHz range with 1 kHz resolution. This division allows fine adjustment at low frequencies and fast range coverage at high frequencies.

The configured settings are stored internally and are automatically restored after the module is restarted, so reconfiguration is not necessary at every power-up. The module also features a settings lock function, activated by a long press, which prevents accidental changes during operation. An On/Off button allows the output signal to be turned on and off without losing the current configuration.

The connections are grouped into two pairs of terminals, V+ and V- for power supply, and PWM and G for the output signal, which simplifies installation and clearly separates the power section from the signal section. The wide 3.3 - 30 VDC supply range makes the module compatible with most development platforms and common laboratory power sources. The generated signal can be used as a clock source, for testing digital inputs, for controlling stepper motor drivers, for adjusting the speed of PWM fans, for controlling LED strip brightness via an external driver, or as a test signal for an oscilloscope. The module can be used together with Arduino UNO, Nano or Mega boards, with ESP32, ESP8266, STM32, Raspberry Pi Pico modules, or other compatible platforms, either as an external signal source or as a test instrument for validating capture and measurement inputs.

The current available at the signal output is limited, so power loads must be driven through a MOSFET transistor, a dedicated driver, or an optocoupler. The output is not intended for directly powering motors, relays, or LED strips.

Important note regarding appearance:

The product shows scratches on the display surface, resulting from the manufacturing process. These are purely cosmetic, do not affect the readability of the displayed values, and do not influence in any way the operation of the module or the accuracy of the generated signal. The scratches do not constitute a defect and are not subject to quality claims. 

Specifications:

Supply voltage: 3.3 - 30 VDC

Frequency: 1 Hz - 150 kHz

Frequency accuracy: approx. 2%

Duty cycle: 0 - 100%

Signal output current capacity: 5 - 30 mA

Output amplitude: equal to the supply voltage

Waveform type: rectangular

Settings memory: Yes, after restart

Settings lock: Yes

On/Off button: Yes

Operating temperature: -20 to +70 °C

Dimensions: 37 x 43 x 78 mm

Display appearance: shows scratches from manufacturing, with no functional impact

Usage:

Mount the module in the panel cutout and secure it according to the available mounting system.

Connect the power supply to terminals V+ and V-, observing polarity and staying within the 3.3 - 30 VDC range.

Connect the PWM terminal to the input of the controlled circuit, and terminal G to its ground, to ensure a common reference.

Power the module and wait for the previously stored values to be displayed.

Rotate the encoder to change the duty cycle value, which is the active parameter at startup.

Briefly press the encoder button to switch to frequency adjustment, then rotate to set the desired value.

Long-press for 5 seconds to switch between the common adjustment mode and the fine adjustment mode, depending on the required precision.

After configuring, long-press for 2 seconds to lock the settings and prevent unintended changes.

Use the On/Off button to enable or disable the output signal without losing the configuration.

Check the signal with an oscilloscope or frequency meter before connecting it to a sensitive circuit.

Pinout:

V- and G are ground references. For correct operation, the ground of the controlled circuit must be connected to terminal G, and the power supply to V+ and V-.