Square Wave Signal Generator 1Hz-150kHz / 0-100% Duty Cycle

This Square Wave Signal Generator is capable of generating square wave signals for experimental development that involves PWM dimming and speed controlling (e.g. motor drivers) as well as other microcontroller use. It can be controlled via the Serial Protocol TTL (TXD & RXD pins). It is stable and reliable, and fairly simple to use.

This Square Wave Signal Generator is based on a 16MHz, 8-Bit MCU STM8S003F3, and a Holtek HT1621B LC display driver, 4 buttons control frequency and duty cycle. It can also be remote controlled by the serial port (see info below).

Specification

• Operating Voltage: 3.3 - 15 VDC
• Frequency Range: 1Hz to 150kHz
• Frequency Accuracy: the accuracy in each range is about 2%
• Signal Load Capacity: 5 - 30 mA
• Output Amplitude: PWM Amplitude Equal to the Supply Voltage
• Operating Temperature: -20 - +70 Celsius
• Dimensions: 52 x 32 x 10 mm
• Communication: 9600,8,1

Operation

1) Setting the frequency of the PWM:

Command "F101": Set the frequency to 101 HZ (001 to 999)

Command "F1.05": set the frequency of 1.05 KHZ (1.00 ~ 9.99)

Command "F10.5": Set the frequency to 10.5KHZ (10.0 ~ 99.9)

Command "F1.0.5": set the frequency of 105KHZ (1.0.0 ~ 1.5.0)

2) Setting the PWM duty cycle:

DXXX": set the PWM duty cycle to XXX; (001 ~ 100)

Example: ?D050?, sets the PWM duty cycle is 50%

3) Read the set parameter

Send a "read" string to read the set parameters.

Set successfully return: DOWN.

Setup failed to return: FALL.