1. The input voltage of the humidifier driver IC chip is 4.5 V (3 batteries)
2. There are 3 channels of PWM output to push the atomizer, and 3 channels of yellow LED level output to indicate the atomizer.
3. The humidifier chip does not work when powered on, there is an ON/OFF button switch control, triggering three groups of atomizers to work at the same time, stopping after 30 minutes of work, and re-triggering to re-time 30 minutes of work. When the switch is triggered during work, it will stop working and re-trigger to work again. The LEDs work synchronously with the atomizer.
So how to put the working voltage of household 220v LCD display chip from 4.5v to 5.5v, and the working current of 2MA (5V)