box-keychain-esp32

A picture is changed every 30 minutes. The standby time has not been tested. Pictures are uploaded in the background. Press the button to update one picture. If the picture is not refreshed, press it 5 times continuously to enter the picture transmission mode.

Connect the PC to WIFI and connect to the Album, and open the Loader interface of http://192.168.4.1 WeiXue.

The current versions are ESP32-PICO-D4(4M)+SDNAND, ESP32-PICO-V3-02(8M).

ESP32 has expanded SDNAND (i.e. a chip TF card), so the capacity is unlimited.

The 8M of other PICO-V3-02 can store thousands of pictures, which is enough.

The ESP32 version also requires a downloader: https://oshwhub.com/guozhaowen/Ch340C-6Pxia-zai-qi-ESP23-8266

The ESP8266 version is at: https://oshwhub.com/guozhaowen/box-keychain

ESP8266 12F is 4M Flash, you can manually change it to 8M/16M, which is enough.

If you are a novice, I suggest you choose the ESP8266 version. There are two versions of 8266, one for TYPEC charging and one for wireless charging.

ESP32 only has one version for wireless charging. If you are interested, you can modify the PCB yourself.

ESP32 consumes more power when transmitting images, between 100-300 mA, and the power consumption during normal operation is equivalent to that of 8266. The standby time with the SDNAND chip should be shorter.

When burning firmware, please note that the package contains partitions and the starting address of the firmware is in the CSV.

The recommended board size is 0.8 (pursue the thickness of the box)

The firmware supports Good Display Red, and is limited to uploading only 20 pictures for testing purposes.

Wireless charging instructions:

The main controller is NU1680. Only one store sells it, Xubao, but it’s not expensive at only 3 yuan.

If you want to use wireless charging, it is best to print with PETG material. If the wireless charging temperature is not low, PLA will become soft.

When assembling, it is best to use gold fingers to wrap the 0.02 LV board and stick it on the NU1680 for heat dissipation. If there is no LV board, you can also find a can.

The capacitor used for wireless charging is 0402, which requires NOP ceramic chip capacitors, which are more expensive.

There are some changes to the PCB and the steel mesh is still old, but it doesn't affect it.

Except for a few dishonest capacitors, it was a success.

This is PICO-V3-02(8M).

This is a 512M (4Gb) SDNAND.