XL1509 USB Voltage Drop Module
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1. When the on-board voltmeter is working normally, press and hold the "Output Enable" button for 2 seconds and then release it, the voltmeter will flash, and then enter the voltage adjustment mode;
2. Touch the "Output Enable" button, the voltage increases by one unit, and touch the "Low Power Consumption" button, the voltage decreases by one unit; since the voltage value of one unit is less than 0.1V, you need to press 1-5 continuously You can see that the voltmeter has changed by 0.1V only once. The specific number of consecutive key presses depends on the current displayed voltage value. The higher the current displayed voltage, the fewer the number of presses;
3. After the voltage adjustment is completed, press and hold the "Output Enable" button for 2 seconds and then release it. At this time, you can exit the voltage calibration mode, and all parameter settings will be automatically saved after power-off.
Note: With this adjustment method, you only need to calibrate once to get accurate voltage values across the entire voltage range. This function is designed to meet your higher precision requirements, please feel free to use it.
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