Micro USB 2CH Adjustable PWM Signal Generator Duty Cycle Pulse Frequency Module Digital LED Display Tube DC 5V 12V 24V DIYHighlights:Two independent PWM generators can set the frequency, duty cycle;The wide frequency range, high accuracy;Can serial communication.First, the module description:Frequency is divided into three ranges:XXX (no decimal point): the smallest unit is 1Hz, the range 1Hz ~ 999Hz;XX.X (decimal point in ten): The minimum unit is 0.1Khz; the range of 0.1KHz ~ 99.9KHzX.X.X. (there are three decimal point): the smallest unit is 1Khz; the range 1KHz ~ 150KHzFrequency display example:"100" indicates that the PWM output pulse of 100Hz;"54.1" indicates that the PWM output pulse of 54.1KHz;"1.2.4." Indicates that the PWM pulse output 124KHzDuty Cycle in the range: 0 to 100;Three frequencies duty cycle is the same, all the parameters non-volatile.Second, the module parameters:Working voltage: 5--30V, support micro USB 5.0V power supply;Frequency range: 1Hz ~ 150KHz;The frequency accuracy: ± 2%;Output Current: <30mA;Output amplitude: Default 5Vp-p (settable);Operating temperature range: -30 ~ + 70 °.Third, the parameter settings:Module has three buttons [Set], [Up], [Down];Press [Set] key to switch the display four parameters (FR1: PWM1 frequency; dU1: PWM1 duty cycle; FR2: frequency of PWM2; dU2: PWM2 duty cycle), before the handover parameters, there will be corresponding parameter name flash.Press [Up], [Down] keys to modify the current parameter value (long press can quickly add or subtract fast).Two PWM each have three preset frequency, the frequency display interface, long press [SET] key to switch between three types of frequencies, three kinds of frequency duty cycle is the same value. (XXX: range 1Hz ~ 999Hz; XX.X: range 0.1Khz ~ 99.9Khz; X.X.X .: range 1Khz ~ 150Khz,).Fourth, the scope:As square wave signal generator which generates a square wave signal;to provide a signal to the stepping motor driver;Adjustable pulse generation for chip use;produce variable pulse signal, the control-related circuit (PWM dimming, speed).Fifth, the serial controlBaud rate: 9600 bpsData bits: 8Stop bits: 1Parity bit: noneFlow control: none1, set the PWM frequency"S1FXXXT": setting PWM1 frequency of XXX HZ (001 ~ 999)"S1FXX.XT": set the frequency of PWM1 XX.X KHZ (00.1 ~ 99.9)"S1F: X.X.X.T": setting PWM1 frequency of XXX KHZ (0.0.1 ~ 1.5.0..)'S1': PWM1'S2': PWM2'F': Frequency'D': Duty Cycle'T' is the end flagSet the PWM duty cycle"S1DXXXT": setting PWM1 duty cycle XXX; (001 ~ 100)"S2DXXXT": set PWM2 duty cycle XXX; (001 ~ 100)Setting successful return: DOWN;Setting failback: FALL.Package Included:1 x 2 way Independent PWM Generator