Introduction

This is a baseboard designed for the USART HMI serial screen. The specific model is the lowest-end model * TJC3224T022_011X. The screen size is 2.2 inches and the resolution is 320 240**. The size completely fits the original screen. The buttons can be used to control the screen display content. The bottom of the board is printed with the "Chinese Valentine's Day Toad" set of pictures that are popular on the Internet. You can also rearrange the PCB layout to fit other screen sizes.

Features

• You can control the content displayed on the screen through the two buttons on the bottom, and there are 4 indicators on the top to show the current status.
• Using ATMEGA8 chip as the main controller, you can use Arduino IDE to program it.
• It has a built-in lithium battery charging and discharging circuit, and the size is only 1/3 of the iPhone 8. It is easy to carry around. You can use it as an electronic badge. A 3.7v 500mah battery can power it for about 4 hours (with screen brightness set to maximum).
• PCB size is less than 10*10 (cm), and you can sample it for 5 yuan.
• The bottom of the PCB is printed with the "Chinese Valentine's Day Toad" set of pictures (solitary frogs) that are popular on the Internet during the Chinese Valentine's Day, permanently imprinting the current trend on the circuit board.

Main components list

This component list does not include common components such as resistors, capacitors, LEDs, and push button switches. Please check the schematic diagram and PCB for details. 1 TJC3224T022_011X serial screen (can be purchased on Taobao and other websites) 1 ATMEGA8A TQFP32 microcontroller 1 TP4056 SOP8 single-cell 3.7v lithium battery charging management chip 1 CE8301 lithium battery boost chip

Physical map

[Explanation] The corresponding component layout in the physical picture is different from that in the project. This is because after I received the board sample and soldered the components, I discovered that there were some major and minor problems in the PCB layout, so I optimized and adjusted them.

Screen (lit) Screen (unlit) Back of the base plate Side of the base plate The front of the base plate (the side with the components welded on) is not displayed because it has been attached to the serial port screen and cannot be disassembled. Some components can be seen through the side .

Demo video

See attachment IMG_0448.MOV