Intelligent matrix clock

The project was modified from the HACK laboratory of Station B. Please refer to the original UP release content for specific parameters.
This project modifies the current extremely expensive DS3231 chip and uses the cheap and user-friendly DS1307. With NTP calibration every 12-36 hours, the error is very small.
The CH340C circuit has been modified and the CH340C chip pins are used to reduce the use of transistors. The PW6566 LDO voltage stabilizing chip is added to the power supply part, and the light sensor and temperature and humidity sensor
can be added by choosing one of the ASM1117 chips .
There are two options for light sensors, 5mm photoresistor and TEMT6000 light sensor. Just choose one of the two. The temperature and humidity sensor uses the AHT20 module.
In addition, the main control module and basic circuit have been modified from ESP-12S to ESP-12F/12E, and the useless pins below have been removed. The Micro-USB interface has been removed, leaving only a Type-c interface.
The display part has modified the arrangement order and orientation of the display modules to facilitate writing programs using the U8G2 library.
Regarding the assembly part, a 3mm black brown acrylic board is used. The mainboard PCB and the top PCB are connected with 11mm copper pillars. The top PCB and the acrylic board use 8mm through-hole copper pillars, with a total of 8 on the top and bottom. M3 screws for fixation.
At present, only the hardware circuit part is made public. There are still many bugs in the program part, which is not made public yet. It is recommended to write it yourself.
 
Now the built-in crystal oscillator RTC, RX8025T-UC, DS3231MZ has been updated, with better accuracy and cheaper price. You can choose between ds1307, rx8025 and DS3231MZ.