Features: 1. This module is an adjustable step-down module. The output voltage can be changed by adjusting the blue adjustable resistor on the module. 2. Accurate incision and interface ensure perfect applicability. Suitable for installation location and easy to install. 3. The product is made of high quality materials. It can effectively avoid corrosion and wear and is durable to use. 4. Professional chip sets provide excellent performance in the system. 5. Easy operation, anti-aging, prolong service life. Specifications: Model: HW-035 Size: Approx. 5*2.5*2cm/1.97*0.98*0.79inch The IN- (input negative), IN+ (input positive), OUT- (output negative), and OUT+ (output positive) indicated on the module must be connected correctly. Otherwise, the module may be damaged. Battery charging method: 1. Determine the floating charge voltage and charging current of the rechargeable battery and the input voltage of the module. 2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V. 3. Measure the output short-circuit current with the 10A current multimeter, and adjust the constant current potentiometer at the same time to make the output current reach the preset charging current value. 4. The default delivery of the charging lamp current is 0.1 times the charging current (constant current value). 5. Adjust the constant voltage potentiometer to make the output voltage reach the floating voltage. 6. Connect the battery and try charging. (Steps 1, 2, 3, 4 and 5 connect the module input to the power supply, and the output is unloaded without connecting the battery.) LED Constant Current Drive Usage Method: 1. Determine the working current and working voltage that you need to drive the LED. 2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V. 3. Measure the output short circuit current with the 10A current multimeter, and adjust the constant current potentiometer to make the output current reach the preset LED working current. 4. Adjust the constant voltage potentiometer to make the output voltage reach the LED working voltage. 5. Connect LED and test the machine. (Steps 1, 2, 3 and 4 connect the module input to the power supply, and the output is unloaded and not connect the LED lamp.) Communication protocol description: 1. This module has the function of communicating with a computer. It is convenient for the computer to read the module current and voltage data. 2. Since the output of this module is TTL level, to achieve communication with the computer, this level should be converted back to the RS232 level that the computer can recognize. It is necessary to use this cp2102 usb to TTL module to achieve conversion. Package List: 1 * Module 1、This module is an adjustable step-down module. The output voltage can be changed by adjusting the blue adjustable resistor on the module. 2、Accurate incision and interface ensure perfect applicability. Suitable for installation location and easy to install. 3、The product is made of high quality materials. It can effectively avoid corrosion and wear and is durable to use. 4、Professional chip sets provide excellent performance in the system. 5、Easy operation, anti-aging, prolong service life.