Liquid Crystal Display PWM Module 1Hz-150Khz 3.3V-30V Signal Generator

Parameters:

• Operating voltage3.3~30V;

• Frequency range1Hz~150KHz;

• Frequency accuracy:In each range of accuracy is about 2%

• Signal load capacity:Output current can be around 5~30ma

• Output amplitude: PWM amplitude and supply voltage equal 

• Ambient temperature:-20~+70°

Module Description:

• Three-channel PWM  is outputted,wide frequency range and the duty ratio can be adjusted independently

• Frequency is divided into four areas,automatic switching:

• 1.XXX(No decimal point): 1HZ Stepping Unit,Range:1Hz~999Hz;

• 2.X.XX(The decimal is in the hundreds place):0.01KHZ Stepping Unit,Range: 1.00Khz~9.99Khz;

• 3.X.XX(The decimal is in the tens place):0.1KHZ Stepping Unit,Range: 10.0Khz~99.9Khz;

• 4.X.X.X(The decimal is in the ones place):1KHZ Stepping Unit,Range: 1Khz~150Khz;

• e.g. ,frequency display:100 represent the pulse of 100Hz ;

• 1.01 represent the pulse of 1.01KHz; 

• 54.1 represent the pulse of 54.1KHz

• 1.2.4 represent the pulse of 124Hz

• The value range of dutyfactor: 0~100%,100% is represented by A0%.

• All parameters setted up can be automatically saved in case of power cut.

Parameter settings:

• Module has 8 independent keys,used to set the frequency and duty ratio,support short press (increase or decrease a unit) and long press (fast increase or decrease),very simple,set the parameters automatically save,power loss.

• 3-Way duty ratio button can be pressed at the same time,real-time adjustment, liquid crystal display is the last pressed button duty ratio,real-time is very strong,can be used as a simple several road duty ratio scan.

3).Scope of application:

• 1.Used as square wave signal generator to generate square wave signal for experiment development and use

• 2.Used to generate a square wave signal to control the motor driver;

• 3.Generating adjustable pulses for MCU use;

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

4).UART serial command

• Baud rate:9600 bps Data length:8

• Stop bits:1

• Check digit:none

• Flow control:none

1.set the frequency of the PWM 

• "F101": Set frequency of 101 HZ (001~999)

• "F1.05": Set frequency of 1.05 KHZ(1.00~9.99)

• "F10.5": Set frequency of 10.5KHZ(10.0~99.9)

• "F1.0.5":Set frequency of 105KHZ(1.0.0~1.5.0)

2.set the duty ratio of PWM

• "DX:YYY": Set PWM duty ratio x: (1~3) PWM serial number,YYY: (000~100) duty ratio;

• For example d1:050,set 1th PWM duty ratio to 50%

3.read setup parameters:

• Send a "read" string to read the parameters of the setting.

• Message format:F156,D1:052,D2:059,D3:058,

• Set successful return:DOWN

• Set failed to return:FALL

• Size:5.5x3.8cm/2.17x1.50inch