2 Channel PWM Pulse Frequency

Two independent PWM outputs, which can change the frequency and duty cycle respectively;

The frequency is divided into three series:
1. XXX (no comma): the minimum unit is 1 hz, and the value varies from 1 hz to 999 hz.
2. XX. X (comma is ten): the minimum unit is 0.1 kHz; The value range is 0.1 kHz ~ 99.9 kHz
3. xXX (three digits have a comma): the minimum unit is 1 kHz; The value range is 1 kHz ~ 150 kHz
E. g. Frequency display: 100 means PWM output 100 Hz pulse;
54.1 indicates that the PWM outputs a pulse of 54.1 kHz;
1.2.4. Gives PWM output 124 kHz pulse
The duty ratio varies from 0 to 100.
The three frequency ranges share a duty cycle, and all setting parameters are saved after power down.

Parameter settings

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

1. By briefly pressing the [Set] key, the display of four parameter values (FR1: PWM1 frequency; dU1: PWM1 duty cycle; FR2: PWM2 frequency; dU2: PWM2 duty cycle), there will be corresponding parameters before switching Name blinking prompt .
2. Press [Up] and [Down] to immediately change the current parameter value (long press can be added quickly or quickly).
3. The two PWMs are pre-configured with three types of frequency values. In the frequency display interface, the long press [SET] key is used to switch, and the duty ratios of the three frequencies are the same. (XXX: range 1 Hz ~ 999 Hz; XX. X: range 0.1 kHz ~ 99.9 kHz; X. xx: range 1 kHz ~ 150 kHz,).

Third, the module parameters:
1. Working voltage: 5--30V supports micro USB 5.0 v power supply;
2. Frequency range: 1 Hz ~ 150 kHz;
3. Frequency accuracy: the accuracy in each range is approximately 2%;
4. Signal load capacity: the output current can be around 8-30ma;
5. output amplitude: standard 5 v V-pp (can be changed by external power supply);
6. ambient temperature: -30 ~ + 70 ° C.

Fourth, the scope:
1. used as a square wave signal generator to generate a square wave signal for experimental development;
2. used to generate a square wave signal that drives the stepper motor driver;
3. generate adjustable pulses for use by the MCU;
4. Generate adjustable pulses and control circuits (applications such as PWM dimming speed control).

Five, serial port control
Communication standard: 9600 bps
Data bits: 8
Stop bit: 1
Check digit: none
Flow control: none

1, the frequency of the PWM
"S1FXXXT": the frequency of PWM1 to XXX HZ (001 ~ 999)
"S1FXX. XT": the frequency of PWM1 XX. X KHZ (00.1 ~ 99.9)
"S1F: XXXT": the frequency of PWM1 to XXX KHZ (0.0.1. ~ 1.5.0.)
"S1": PWM1
"S2": PWM2
"F": frequency
"D": duty cycle
"T" is the end flag
2, set the duty cycle of the PWM
"S1DXXXT": Set the duty ratio of PWM1 to XXX; (001 ~ 100)
"S2DXXXT": Set the duty cycle from PWM2 to XXX; (001 ~ 100)
Set the success to return: DOWN;
Setting not return: FALLING.