Portable information board

"Portable information board", as the name suggests, displays the information you want to display on a device (screen) that you carry with you. The inspiration for this idea was that I met many elderly people who were lost before, but some of them were too old, had poor memory, forgot where their home was, couldn’t find their family members’ phone numbers, etc. (Although there are only a few, they are still exists, and China’s population is aging increasingly, so the proportion will inevitably increase).

Since the "portable information board" needs to be carried on the body and can display information as needed, it must have the following functions:

(1) A screen (nonsense, to display information, do you use a digital tube?)
(2) Wireless communication to update the information you want to display at any time
(3) Low power consumption, don’t run out of power after two days of use. . The old man took it out without forgetting it. It would be embarrassing if the information board lost the information first.

To sum up, the "portable information board" will use the currently popular low-power e-Paper ink screen as the information display end, and use the low-power, low-cost, high-performance GD32 as the main control, low-power BLE4.0 The Bluetooth module serves as a communication device.