4.2-inch Bluetooth electronic photo album

This project is to transform Xianyu 9.9's new 4.2-inch ses price tag for Bluetooth photo album
theory. This kind of shell is universal, but this kind of price tag is cheap and easy to overturn. It has aging and
simple function instructions. See the video below
for new ses 4.2 ink. The screen price tag is changed to Bluetooth to support image transmission. When the photo album ornaments
are moved through the DA14585 price tag board and the original SES main control board, only two additional components (one is a button and the other is an LED) are not soldered. There are very few materials needed
to move the board da14585 circuit and the ink screen driver circuit and shrapnel on the ses motherboard.
 
For the source and programming of da14585, please refer to the article below. In theory, this main control board can be used, just disassemble the mcu
https:// oshwhub.com/article/ru-he-kuai-su-shang-shou-yi-kuan-xin-xin-pian
smartsnippets download link: https://share.weiyun.com/u05VvRzy Password:
required when there are multiple zfmcma Manually write otp mac, use the mac in the code by default, mac will conflict the same, cannot search and
burn, cancel bootable, check
power consumption measurement
, no connection, broadcast interval 1S, average 13uA
connection power consumption, average 250ua, it will be disconnected if the picture is not transmitted. Opening
the connection requires good soldering skills. It is easy to solder joints. It is best to burn it first and then disassemble and solder it.
The function of the LED is to flash when power is on to indicate normal startup (LED Xubaosou 2121RGB).
The button is for reset. Occasionally, the power is not normal and needs to be reset to operate normally.
The antenna signal is not good and the communication distance is relatively short, about 2 meters. It can only It is said that it is not unusable
and will be refreshed regularly, once every 24 hours or so.
It supports OTA and can be upgraded through suota app.
 
2023/5/15 Optimization
1. Modify the hardware resistor R15 to 1K. The original board is 56R as the current limiting resistor is too small. I read it wrong. I thought it was 560R
2. No components in the antenna part are soldered, just fly a line to make the antenna, and the signal can be close to the original board
. 3. Firmware 20230515 realizes automatic saving of pictures (automatic refresh at 0 o'clock, if the picture is different from the flash, it will be automatically saved) , the picture in the flash will be displayed next time you restart), the low battery flashes red, the ble connection flashes green, the ble battery service can read the current battery (no upper level software)
install the suota app, and put the img format firmware in the Suota folder of the phone. Only software can find the firmware. Do not change all the options by default. Just click upgrade. Finally, restart and select yes.
 
This hardware and firmware are basically stable and will not be modified. The 9.9 screen is basically aging, and the displayed picture may be the best. Purpose, 3 original buttons can be used for more than 2 years, and new ones can be used for about 5 years. The average 24-hour current is about 20ua.
Someone who can write small programs can write this image transfer small program. The front end is not very good, and it is too laborious to write. Got it