2 Channel PWM Frequency Duty Cycle Adjustable Wave Rectangle Signal Generator Features: 1. . 2. Two independent PWM outputs, which can set the frequency and duty ratio separately. 3. Wide frequency range and high precision. 4. This product can be serial communication. 5. Can be used to generate adjustable pulse for MCU using and control relative circuit.   Specification: Condition: Operating Voltage: 5-30V, support micro USB 5.0V power supply Frequency Range: 1Hz-150KHz Frequency Precision: 2% Signal Load Capacity: Output Current is within 8--30mA Output Range: default 5V V-pp (can be changed by external power) Environment Temperature: -30 ~70℃ Serial Port Control: Communication Standard:9600 bps                                Data Bit:8                                Stop Bit:1                                Verify Bit:none                                 Flow Control:none Weight: Approx. 9g / 0.3oz Size: Approx. 41 * 28 * 1.6mm / 1.6 * 1.1 * 0.1in   Parameter Setting: Module has 3-channel key:Set,Up,Down 1. By short press SET key, can shift display 4 parameter values (FR1:PWM1 frequency; dU1:PWM1 duty cycle; FR2:PWM2 frequency; dU2:PWM2 duty cycle); before shifting,there will be corresponding parameter name flashing 2. Directly press UP,DOWN key to modify current parameter value 3. 2-chhannel PWM are set 3 kinds frequency value, in frequency display interface,by long press SET to shift, 3 kinds frequency's duty cycle are the same (XXX:1Hz~999Hz; XX.X:0.1Khz~99.9Khz;X.X.X.:1Khz~150Khz)   Setting PWM Frequency: 1."S1FXXXT": set PWM1 frequency as XXX HZ (001~999) 2."S1FXX.XT": set PWM1 frequency as XX.X KHZ (00.1~99.9) 3."S1F:X.X.X.T": set PWM1 frequency as XXX KHZ (0.0.1.~1.5.0.) 4."S1": PWM1 5."S2": PWM2 6."F": frequency 7."D": duty cycle 8."T": stop sign bit   Setting PWM Duty Cycle: 1."S1DXXXT": set PWM1 duty cycle as XXX(001~100) 2."S2DXXXT": set PWM2 duty cycle as XXX(001~100) Setting successfully back: DOWN Setting unsuccessfully back: FALL   Package List: 1 * Wave Rectangle Signal Generator