The module logic circuits are powered from a 3.3V regulator, so the VIN+ voltage is usually selected to set the amplitude that is needed for the PWM output.
The VIN+ input has a Schottky reverse polarity protection diode. Same for VIN- which is the ground connection. The two connections are internally connected and only one needs to be used. The module can operate from 3 to 30V power input on the VIN+ connections. The minor functionality differences are noted down below under ‘Our Evaluation Results” Powering the Module Note that we may ship boards with fabs marked XY-LWPM or HW-753. This is only of interest to anyone thinking about hacking the software on the module. There is also an easy hack to boost the current capability up to about 100mA which is explained down below in Our Evaluation Results section.īesides the VIN power input connector and PWM output connectors described below, there is a connector on the back of the board labeled J3 which provides access to the programming port of the microcontroller. This output is suitable fro driving a logic input or to drive a MOSFET transistor if you need to increase the module drive capability. The 1K resistor limits the maximum available drive current which will vary depending on the VIN+ input voltage and range from about 5mA up to 30mA. The transistor has a series 1K resistor tied to VIN+, so the PWM signal will swing between ground and the module supply voltage on the VIN+ pin. The PWM output pin on the microcontroller drives an NPN MMBT3904 type transistor which in turn drives the PWM output pin of the module.
#5V PANEL MOUNT LED SERIAL#
The microcontroller accepts inputs form the pushbuttons or the TTL serial interface and generates the PWM output signal by using the built-in oscillator and timing circuits of the microcontroller. The VIN+ input voltage powers a 3.3V linear regulator that supplies 3.3V to the logic circuits on the module. These modules are built with either a Holtek N76E003AT20 or ST Micro STM8S003F3P6 microcontroller and functionality is the same in either case. The reverse engineered schematics show the basic layout of the module. Adding an output driver allows it to drive motors, solenoids, servos, dim LEDs and other pulse applications. Having the display and simple pushbutton interface makes it easy to set.
#5V PANEL MOUNT LED GENERATOR#
This is a nice little module that can be used as a flexible square wave generator for conducting experiments, testing and controlling devices that require a PWM input. Serial TTL interface, 3.3V logic compatible.
LCD display of frequency and duty cycle.3-30V operation and output pulse amplitude.KEY FEATURES OF PWM SIGNAL GENERATOR MODULE: XY-LPWM or HW-753 PWM Signal Generator Module.The PWM Signal Generator Module combines an accurate 0-150kHz PWM generator with pushbutton controls and LCD display that shows frequency and duty cycle.
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