Power supply properties:
Module nature: non-isolated step-down module
Rectification: Non-synchronous rectification
Input voltage: 5V-30V
Output voltage: 0.8V-29V
Output current: maximum 5A (more than 3A to strengthen the heat)
Conversion efficiency: 95% (highest)
Switching frequency: 300KHz
Output ripple: 50mV (max) 20M bandwidth
Load regulation: ± 0.5%
Voltage regulation: ± 2.5%
Operating temperature: -40 ℃ to +85 ℃

Instrument properties:
Module Name: Current Voltmeter
Measurement accuracy: 0.1%
Refresh time: about 200ms
Display: double 4 0.28 "digital tube
Current range: 0A-5A
Voltage range: 5V-30V
Operating current: less than 15mA
Storage temperature: -10 ° C to + 65 ° C
Input impedance: 50 milliohms

IN- (input negative), IN + (input positive), OUT- (output negative), OUT + (output positive) marked on the module must be connected correctly. Otherwise, the module may be damaged.

Battery Charging Usage:

1. Determine the float voltage and charge current that you need to charge the battery, the input voltage of the module;
2. Adjust the constant voltage potentiometer, adjust the output voltage to 5V or so.
3. With the multimeter 10A current block output short-circuit current measurement, while adjusting the constant current potentiometer to output current to a predetermined charge current value;
4. Charging the turn-on lamp current is 0.1 times the default charge current (constant current value).
5. Adjust the constant voltage potentiometer to make the output voltage reach the float voltage;
6. Connect the battery and try charging.

(1,2,3,4,5 steps for the module input power, the output is not connected to the battery.)

LED constant current drive to use:
1. Determine the operating current and maximum operating voltage that you need to drive the LED;
2. Adjust the constant voltage potentiometer, adjust the output voltage to 5V or so.
3. With the multimeter 10A current block output short-circuit current measurement, and adjust the constant current potentiometer to output current to reach the predetermined LED operating current;
4. Adjust the constant voltage potentiometer to make the output voltage reach the highest working voltage of LED;
5. Connect the LED, test machine.

(1,2,3,4 steps for the module input power, the output no load LED lights.)

Communication Protocol:
1. This module has the function of communication with the computer. Can facilitate the computer to read the module current and voltage data,
2. As the output of the module is TTL level, to achieve and computer communications, but also the level of conversion back to the computer can identify the RS232 level, need to use this cp2102 usb transfer TTL moduleTo achieve the conversion.
3. The communication protocol is as follows:

Baud rate: 9600 Bps
BB CC ADDR 00 XX XX CRC (current return command)
BB CC ADDR 01 XX XX CRC (voltage return command)

BB CC for the header (2 bytes)
ADDR is the module address (1 byte)
00 is a read current command (1 byte)
01 is the voltage read command (1 byte)
XX XX Any value (2 bytes)
CRC CRC check (1 byte)