Scheme introduction
1、 Hardware board description：
Keys: 6
Indicator light: 1 power supply indicator light is red, and the charger is powered on and the red light indicates normal; If the light is not on, it represents an error.
The five key password lights are blue: press one digit password, one password light will be on, all five passwords are correct, all password lights are blue, and the power on indicator light will remain unchanged; The password is incorrect. All the five lighted password lights are off, and the power on indicator remains unchanged.
The 1-digit clear key. After pressing the clear key, all the passwords that have been entered will be cleared and re entered from the first digit.
2、 System functions：
Four groups of packages: 1 hour, 2 hours, 3 hours and 12 hours.
Four groups of passwords, 10 passwords for each group. Only one set of passwords can be charged each time. Greatly improve the probability of being cracked.
Input 5 33333 for free charging for 5 minutes.
If the charging time is not used up, unplug the plug and power on without powering off.
5V 2.1A fast charging.
Performance parameter
Industry classification: consumer electronics
Delivery form: PCBA
Performance parameters: 6 keys, 5 passwords, 5V 2.1A output
Application scenario: hotels, Internet cafes, bath centers, KTVs, etc
