PWM Frequency Duty Cycle Adjustable Square Wave Signal Generator

DC 5-30V Micro USB 5V Power Independent PWM Generator 2 Channel Dual Way Digital LED Duty Cycle Pulse Frequency Board Module

Module highlights:
Two independent PWM outputs, which can set frequency and duty cycle respectively.
The frequency range is wide and the precision is high.
Serial communication
Size: 41*28mm thickness: 1.6mm

Module description:
Two independent PWM outputs can set frequency and duty cycle respectively.
The frequency is divided into three ranges:
XXX (without decimal point): the smallest unit is 1Hz,and the value range is 1Hz~999Hz;
XX.X (decimal point in ten places): the smallest unit is 0.1Khz; and the range is 0.1KHz~99.9KHz.
X.X.X. (three places all have decimal places): the smallest unit is 1Khz; and the range is 1KHz~150KHz.
E.g. frequency display: 100 indicates PWM output 100Hz pulse;
54.1 is the pulse of the PWM output 54.1KHz;
1.2.4. represents the pulse of the PWM output 124KHz
The range of duty ratio: 0~100;
Three frequency ranges share a duty cycle,all settings parameters,power down preservation.

Parameter settings:
The module has 3 keys: Set,Up,Down;
1. by switching the Set button,switching to display four parameter values (frequency of FR1:PWM1; dU1:PWM1 duty ratio; FR2:PWM2
frequency; dU2:PWM2 duty ratio),there will be a corresponding parameter name flicker before switching.
2. press Up and Down to modify the current parameter value.
3. there are 3 kinds of frequency values in each preset of two PWM. The interface is displayed at this frequency,and the
switching frequency of the 3 frequencies is consistent with the SET switch. (XXX: range 1Hz~999Hz; XX.X: range 0.1Khz~99.9Khz;
X.X.X.: range 1Khz~150Khz,).
Three. Module parameters:
1. working voltage: 5--30V supports micro USB 5.0V power supply;
2. frequency range: 1Hz~150KHz;
3. frequency accuracy: accuracy is about 2% in each range.
4. signal load capability: output current can be around 8--30ma;
5. output amplitude: default 5V V-pp (can be changed through external power);
6. environment temperature: -30~+70 C.
Four. The scope of application:
The 1. is used as a square wave signal generator to generate square wave signals for experimental development.
The 2. is used to generate square wave signals for driving stepper motor drivers.
3. the adjustable pulse is produced for use by MCU.
4. generate adjustable pulses to control related circuits (PWM dimming and speed regulation applications).
Five,serial port control
Communication standard: 9600 BPS
Data bit: 8
Stop: 1
Checkout bit: None
Flow control: None
1. Set the frequency of PWM
"S1FXXXT": the frequency of setting PWM1 is XXX HZ (001~999).
"S1FXX.XT": the frequency of setting PWM1 is XX.X KHZ (00.1~99.9).
"S1F:X.X.X.T": the frequency of setting PWM1 is XXX KHZ (0.0.1.~1.5.0.).
'S1': PWM1
'S2': PWM2
'F': frequency
'D': duty cycle
'T' is the end mark
2. Setting up the duty ratio of PWM
"S1DXXXT": the duty ratio of setting PWM1 is XXX; (001~100)
"S2DXXXT": the duty ratio of setting PWM2 is XXX; (001~100)
Set a successful return: DOWN;
Set failure to return: FALL.