Module highlights: 1. 3-way output, adjustable frequency, consistent 3-way frequency output, independent duty cycle adjustment, suitable compatible with most occasions; 2. The frequency and duty cycle of are very clear and easy to ? ?adjust 3. Wide frequency range and high precision; 4. Serial communication Module description 3-way output, wide frequency range and independent real-time adjustment of duty cycle; The frequency is divided into four ranges, automatic switching: 1. (without decimal point): the small unit is 1Hz, and the value range is 1Hz ~ 999hz; 2. The small unit of x.xx (the decimal point is in the hundreds) is 0.01khz, and the value range is 1.00khz ~ 9.99khz; 3.? ? ?. X (decimal point in ten digits): the small unit is 0.1khz; Value range: 10.0khz ~ 99.9khz 4. X.x.x (the decimal point is in the tenth and hundreds): the small unit is 1kHz; Value range: 1kHz ~ 150kHz e. G. frequency display: 100 indicates that outputs 100Hz pulse; 1.01 indicates output pulse of 1.01k; 54.1 indicates that the outputs a pulse of 54.1khz; 1.2.4 indicates that the outputs 124khz pulses; Duty cycle value range: 0 ~, where is represented by A0%. All setting parameters shall be saved after power failure. ? 2?? Parameter setting The module has 8 independent keys, which are used to set the frequency and duty cycle. It supports short press (increase or decrease by one unit) and long press (increase or decrease quickly). It is very simple. After setting, the parameters are automatically saved and will not be lost in power failure. The 3-way duty cycle keys can be p