$2 Square Wave PWM Function Generator (4K)

A PWM single function (square wave) signal generator. My best attempt at deciphering the details from the seller follow.

===============================
VOKTTA Signal Generator PWM Pulse Frequency Duty Cycle Adjustable Module LCD Display 1Hz-150Khz 3.3V-30V PWM Board ModuleLCD display.

Frequency and duty cycle of the PWM output can be set.

Has TTL Serial communication.Frequency is divided into four ranges, automatic switching (this does not seem to be for another model):
XXX (no decimal point): the smallest unit is 1Hz, the value range of 1Hz ~ 999Hz;
X.XX (decimal point in the hundred) the smallest unit is 0.01Khz, the range of 1.00Khz ~ 9.99Khz;
XX.X (decimal point in ten): the smallest unit is 0.1Khz; value range of 10.0KHz ~ 99.9KHz
X.X.X (decimal point in ten and hundred): the smallest unit is 1Khz;
value range 1KHz ~ 150KHzFrequency display:
100 indicates PWM output 100Hz pulse;
1.01 indicates PWM output 1.01K pulse;
54.1 indicates that the PWM output has a pulse of 54.1 kHz;
1.2.4 indicates that the PWM output is 124 kHz pulse;

Duty cycle range: 0 ~ 100%;
All set parameters, automatically saved at power-down.

Parameter Settings:The module has four keys, used to set the frequency and duty cycle, support touch (increase or decrease a unit) and long press (fast increase or decrease), set the parameters automatically saved.

The Module Parameters:
Working voltage: 3.3 ~ 30V;
Frequency range: 1Hz ~ 150KHz;
Frequency accuracy: the accuracy in each range is about 2%;
Signal load capacity: the output current can be about 5 ~ 30ma;
Output amplitude: PWM amplitude equal to the supply voltage;
Ambient temperature: -20 ~ +70 ℃.

Scope Of Application:
Used as a square wave signal generator, generate square wave signal for experimental development and use;
Used to generate a square wave signal that controls the motor driver;
Generate adjustable pulse for MCU use;
Generate adjustable pulse, control the relevant circuit (PWM dimming speed and other applications).

Serial Control (single-chip TTL level communication):
Communication standard: 9600 bps Data bits: 8Stop bit: 1Check digit: noneFlow control: none1)

Set the frequency of the PWM
"F101": Set the frequency to 101 HZ (001 to 999)
"F1.05": set the frequency of 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 of 105KHZ (1.0.0 ~ 1.5.0)2)

Set the PWM duty cycle"DXXX":
set the PWM duty cycle to XXX; (001 ~ 100)Such as D050, set the PWM duty cycle is 50%3)

Read the set parameters
Send a "read" string to read the set parameters.

Package Includes: Brand VOKTTA SKU 2322142926_TH-7846169013 Warranty Type No Warranty