Module Highlights:_x000D_1.LCD display frequency and duty cycle, very clear, PWM output can be set to the frequency and duty cycle;_x000D_2. Wide frequency range, high precision;_x000D_3. Serial communication, TTL level_x000D_First, the module description_x000D_PWM output, you can set the frequency, duty cycle; _x000D_Frequency is divided into four ranges, automatic switching:_x000D_1. XXX (no decimal point): the smallest unit is 1Hz, the value range of 1Hz ~ 999Hz;_x000D_2. X.XX (decimal point in the hundred) the smallest unit is 0.01Khz, the range of 1.00Khz ~ 9.99Khz;_x000D_3. XX.X (decimal point in ten): the smallest unit is 0.1Khz; value range of 10.0KHz ~ 99.9KHz_x000D_4. X.X.X (decimal point in ten and hundred): the smallest unit is 1Khz; value range 1KHz ~ 150KHz frequency display: 100 indicates PWM output 100Hz pulse;_x000D_1.01 indicates PWM output 1.01K pulse;_x000D_54.1 indicates that the PWM output has a pulse of 54.1 kHz;_x000D_1.2.4 indicates that the PWM output is 124 kHz pulse;_x000D_Duty cycle range: 0 ~ 100%;_x000D_All set parameters, power-down automatically saved._x000D_Second, the parameter settings_x000D_The module has four independent 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 save, power down Not lost._x000D_Third, the module parameters:_x000D_1. Working voltage: 3.3 ~ 30V;_x000D_2. Frequency range: 1Hz ~ 150KHz;_x000D_3. Frequency accuracy: the accuracy in each range is about 2%;_x000D_4. Signal load capacity: the output current can be about 5 ~ 30ma;_x000D_5. Output amplitude: PWM amplitude equal to the supply voltage;_x000D_6. Ambient temperature: -20 ~ +70 ._x000D_Fourth, the scope of application:_x000D_1. Used as a square wave signal generator, generate square wave signal for experimental development and use;_x000D_2. Used to generate a square wave signal that controls the motor driver;_x000D_3. generate adjustable pulse for MCU use;_x000D_4. generate adjustable pulse, control the relevant circuit (PWM dimming speed and other applications)._x000D_5, serial control (single-chip TTL level communication)_x000D_Communication standard:_x000D_9600 bps Data bits: 8_x000D_Stop bit: 1_x000D_Check digit: none_x000D_Flow control: none_x000D_1, set the frequency of the PWM_x000D_"F101": Set the frequency to 101 HZ (001 to 999)_x000D_"F1.05": set the frequency of 1.05 KHZ (1.00 ~ 9.99)_x000D_"F10.5": Set the frequency to 10.5KHZ (10.0 ~ 99.9)_x000D_"F1.0.5": set the frequency of 105KHZ (1.0.0 ~ 1.5.0)_x000D_2, set the PWM duty cycle_x000D_"DXXX": set the PWM duty cycle to XXX; (001 ~ 100)_x000D_Such as D050, set the PWM duty cycle is 50%_x000D_3, read the set parameters_x000D_Send a "read" string to read the set parameters._x000D_Set successfully return: DOWN;_x000D_Setup failed to return: FALL_x000D_