Verification of multi-channel SSD1306OLED screen drive solution

## Note:

The verification method uses 3 0.96-inch SSD1306s. It is only used to verify the principle. The circuit is for reference only. The circuit design is not perfect. Please do not copy it directly.

## Principle:

The 0.96-inch SSD1306 screen has two I2C addresses. You can switch by pulling up or pulling down the `D/C#` pin. Always write data to one of the addresses. In this way, only the screen with the `D/C#` pin pulled low can receive data.

Combined with 74HC595, no matter how many screens there are, 5 IO ports can be used to drive.

The idea comes from the video https://www.bilibili.com/video/BV1Zt4y157Yu Zhihuijun's comment.

![20220909_141757.jpg]
## Problem

The object I soldered has a magical BUG. It may be a problem with my circuit design, or a problem with the program, or a problem with the chip I bought (I bought 74HC595 for driving digital tubes). The chip must be heated to switch the address normally (blow at 180 degrees for 10 seconds with an air gun). After the chip cools down, the problem will occur again. However, this problem does not affect the verification of the idea. My idea is correct. I can achieve the purpose of driving multiple screens at the same time by switching the I2C address. ## See the attached video

for demonstration