nsLD1q9C

A PM2.5 detector for only 5 yuan!

 
Overview
Test video:
https://www.bilibili.com/video/BV1gw4m1o7uQ/
 
Detailed information:
Control chip: STC8H2K 1 piece; Sensor: 1949-B01 (no datasheet available, research price) 2.8 pieces; Normal price: 15+;
Optional accessories: LCD1602 1 piece (research price); TM1637 1.8 pieces; 5V5010 bearing fan 2.9 pieces; 3D printed air duct 2.8 pieces; 18650 battery (research price); IP5306+1U+TypeC 2.5 pieces;
 
Pin connections:
 TM1637_CLK = P3^2; TM1637_DIO = P3^3;
 
TXD, RXD connection to the microcontroller.
Note!
Because research price products are used, my actual test result is 9600 baud rate instead of 4200 baud rate, which differs from the certificate. Please judge carefully!
Caution!
Please change the frequency to 12MHz in the ISP as shown in the figure:
 
参考设计图片
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Update:2026-03-26 17:26:51

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