Two-channel PWM pulse frequency duty cycle adjustable module square wave rectangular wave signal generator stepper motor drive



Module highlights:



1. Two-channel independent PWM output, frequency and duty cycle can be set respectively;



2. Wide frequency range and high accuracy;



3. Serial port communication



Overall size: 41*28mm thickness: 1.6mm



I. module description



Two independent PWM output, can set the frequency, duty cycle;



Frequency is divided into three ranges:



1. XXX(without decimal point) : the minimum unit is 1Hz, with the value ranging from 1Hz to 999Hz;



2. XX.X(decimal in the tens place) : the smallest unit is 0.1Khz; Values range from 0.1KHz to 99.9KHz



X.X.X.(all three decimal places) : 1Khz minimum; Values range from 1KHz to 150KHz



Frequency display: 100 represents 100Hz pulse output by PWM;



54.1 represents the pulse of 54.1KHz output by PWM;



1.2.4. Pulse indicating PWM output of 124KHz



Duty cycle value range: 0~100;



The three frequency ranges share a duty cycle, all Settings parameters, power off save.


Parameter Settings



The module has three buttons: Set, Up and Down;



1. By pressing the [Set] key, switch to display the values of four parameters (FR1: frequency of PWM1; DU1: duty cycle of PWM1; FR2: frequency of PWM2; DU2: duty cycle of PWM2), the corresponding parameter name will flicker before switching.



2. Directly press [Up], [Down] key to modify the current parameter value (long press can quickly add or subtract).



3. In the display interface of this frequency, long press the [SET] key to switch down, and the duty cycle of the three frequencies is consistent. (XXX: range: 1Hz~999Hz; XX. X: 0.1 Khz to 99.9 Khz range; X. x. : range 1Khz to 150Khz,).



Iii. Module parameters:



1. Operating voltage: 5-30v support micro USB 5.0v power supply;



2. Frequency range: 1Hz~150KHz;



3. Frequency accuracy: the accuracy in each range is about 2%;



4. Signal load capacity: the output current can be around 8-30ma;



5. Output range: default 5V v-pp (can be changed by external power supply);



6. Ambient temperature: -30~+70℃.



Iv. Scope of application:



1. Used as square wave signal generator to generate square wave signal for experimental development;



2. Generate the square wave signal used to drive the stepper motor driver;



3. Generate adjustable pulse for MCU;



4. Generate adjustable pulse and control related circuit (PWM dimming speed regulation and other applications).



V. serial port control



Communication standard :9600 BPS

Data bits: 8

Stop bits: 1

Check digit: none

Flow control: none



1. Set the PWM frequency



"S1FXXXT" : set the frequency of PWM1 to XXX HZ (001~999)



"S1fxxt" : set the frequency of PWM1 to XX.X KHZ (00.1~99.9)



"S1F:X.X.X.T" : set the frequency of PWM1 to XXX KHZ (0.0.1.~1.5.0.)



'S1' : PWM1



'S2: PWM2



"F" : frequency



'D:' duty ratio



'T' is the end bit



2. Set the duty cycle of PWM



"S1DXXXT" : set the duty cycle of PWM1 to XXX; (001 ~ 100)



"S2DXXXT" : set the duty cycle of PWM2 to XXX; (001 ~ 100)



Set to return: DOWN;



Set failure return: FALL.