1. LCD1602 LCD data download link:https://pan.baidu.com/s/1sGqACX7yY6GSHL4m_cKUyQ
Extract code: 8888
2. Download link of IIC LCD adapter board information:https://pan.baidu.com/s/1Yr74R8GVXv5tu8h7VaSlUQ
Extract code: 8888
3. UNO's reference article using LCD1602:
1) https://blog.csdn.net/acktomas/article/details/88136405
2) http://www.360doc.com/content/15/0630/02/12109864_481596656.shtml
4. Reference articles for using LCD1602 in STM32:
https://blog.csdn.net/investspace/article/details/98209457
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Frequently Asked Questions:
①How to solve the problem that the I2C LCD1602 LCD screen cannot be displayed on UNO?
https://mc.dfrobot.com.cn/thread-297811-1-1.html
②stm32 study notes--LCD1602 display
https://blog.csdn.net/weixin_30645617/article/details/95777031
③The problem of only displaying the first row of squares (backlight adjustment):
The 15th pin is the positive electrode of the backlight source, and generally requires an external 10 ohm resistor.
The third pin is the LCD display bias signal. Generally, an external 10k potentiometer is required to adjust the display contrast.
Notice:
1602 soldering IIC module does not display, the module batches are different, the chip address is different, you can change the sample program test by yourself, 8574A address + write 0x7e 8574 Address + Write 0x4e 8574T address + write to 0x27
【Default device address is 0x27]
Model introduction:Welded needleIt can be cooperated with the 16P mother seat, realized that it can be inserted and replaced, or it can be welded directly on the circuit board. It is convenient and fast.
IIC versionWelded the IIC module to the screen so that 2 IO port drives (originally needed more than 7 IO ports) can be achieved, saving the IO port.
1602 Information download address:https://pan.baidu.com/s/189ozdqrfogngq7Eth6ZLPG Extract code: XZLI
IIC information download address:https://pan.baidu.com/s/1vAScDrxxgYMhJydNHCRKhg
LCD pin interface description: 
