3.27-inch electronic paper screen clock

A clock/weather forecast station based on a 3.27-inch ink screen, supporting the following functions:

1. Show today's and tomorrow's weather
2. current time
3. Indoor and outdoor temperature and humidity (outdoor temperature and humidity are obtained by the weather API, indoors are obtained by the sht30 sensor)
4. Device battery

The supported screen is Weifeng’s 3.27-inch dual-color ink screen

Thank you @duck for your selfless help and firmware support

Update log:

2021.4.14

1. The ESD diode is replaced with SRV05-4;
2. PCB transplanted to 3.27 inches;
3. Optimize the schematic.

2021.3.27

1. Continue to optimize the schematic diagram to make it clearer and easier to understand and standardize.
2. Solved the problem that the esp8266 cannot start without forcing the TX pin of the esp8266 to be pulled up (if it still doesn't work, please solder a 10k resistor at the NC resistor )
3. Change the ch340c to a 3.3v level power supply to unify the power supply and level.
4. Solved the problem of low battery power displayed on the screen after startup without connecting the battery or turning on the power switch.
5. Continuously optimize wiring

ps: The seat of this screen is connected from the bottom! Continue next! Continue next! Don't make the mistake of calling it a top connection.

pss: The extreme compressed space version has been successfully verified, please feel free to eat it.

If you are interested, you can join the QQ group 556951885. There are shell files, firmware, BOM tables, etc. in the group. There are barriers to entry to the group. You have to provide photos of Lichuang's board games or answer the questions correctly to join the group. If you can't do either of these, I'm sorry.

Support and firmware are provided free of charge for personal production. If you have any commercial or profit-making ideas, please leave.